1
|
Wu N, Liu Y, Wang S, Xing Z. Thermal Rectification across an Asymmetric Layer Carbon Nanotube van der Waals Heterostructure. ACS APPLIED MATERIALS & INTERFACES 2024; 16:9155-9168. [PMID: 38324388 DOI: 10.1021/acsami.3c17317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
The exceptional thermal conductivity and strength of carbon nanotubes (CNTs) position them as outstanding materials for thermal conduction. The intriguing properties introduced by van der Waals (vdW) heterojunctions have also captured the interest of researchers. However, further refinement of the research concerning the integration of these two elements is required. In our study, a vdW heterostructure with asymmetric layer nesting of multiwalled CNTs (ALCNTs) is devised, with a specific focus on the model's heat flux and thermal rectification (TR) properties, which are analyzed using nonequilibrium molecular dynamics (NEMD). Notably, the greatest TR ratio is observed in the connection of three-layer and single-layer ALCNTs. Moreover, multilayer variable-length nested models exhibit a sluggish TR ratio. An examination of the interface thermal resistance (ITR) reveals that the maximum ITR in the multilayer nested model resides at the rightmost interface. However, it is essential to highlight that the determinant of the TR ratio and heat flux in the multilayer nested model is not the maximum ITR of the rightmost interface but rather the ITR of the outermost layer on the left. Additionally, the impacts of the defect density, length, temperature difference, and hydrogenation on the model's heat flux and TR are explored, yielding noteworthy conclusions. For instance, defects in the outer CNT have a minimal influence on the heat flux and TR compared with those in the inner CNT. As the length increases, the heat flux initially decreases and then increases. Hydrogenation significantly enhances the model's heat flux but does not favor the TR. Our study contributes to advancing the understanding of CNT vdW heterojunctions and offers valuable insights for their practical applications.
Collapse
Affiliation(s)
- Ning Wu
- Department of Power Engineering, School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, Hebei, China
| | - Yingguang Liu
- Department of Power Engineering, School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, Hebei, China
- Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology, North China Electric Power University, Baoding 071003, Hebei, China
| | - Shuo Wang
- Department of Power Engineering, School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, Hebei, China
| | - Zhibo Xing
- Department of Power Engineering, School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, Hebei, China
| |
Collapse
|
2
|
Sacchi M, Tamtögl A. Water adsorption and dynamics on graphene and other 2D materials: Computational and experimental advances. ADVANCES IN PHYSICS: X 2022; 8:2134051. [PMID: 36816858 PMCID: PMC7614201 DOI: 10.1080/23746149.2022.2134051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 09/26/2022] [Accepted: 09/27/2022] [Indexed: 06/18/2023] Open
Abstract
The interaction of water and surfaces, at molecular level, is of critical importance for understanding processes such as corrosion, friction, catalysis and mass transport. The significant literature on interactions with single crystal metal surfaces should not obscure unknowns in the unique behaviour of ice and the complex relationships between adsorption, diffusion and long-range inter-molecular interactions. Even less is known about the atomic-scale behaviour of water on novel, non-metallic interfaces, in particular on graphene and other 2D materials. In this manuscript, we review recent progress in the characterisation of water adsorption on 2D materials, with a focus on the nano-material graphene and graphitic nanostructures; materials which are of paramount importance for separation technologies, electrochemistry and catalysis, to name a few. The adsorption of water on graphene has also become one of the benchmark systems for modern computational methods, in particular dispersion-corrected density functional theory (DFT). We then review recent experimental and theoretical advances in studying the single-molecular motion of water at surfaces, with a special emphasis on scattering approaches as they allow an unparalleled window of observation to water surface motion, including diffusion, vibration and self-assembly.
Collapse
Affiliation(s)
- M. Sacchi
- Department of Chemistry, University of Surrey, Guildford GU2 7XH, UK
| | - A. Tamtögl
- Institute of Experimental Physics, Graz University of Technology, 8010 Graz, Austria
| |
Collapse
|
3
|
Boix V, Scardamaglia M, Gallo T, D’Acunto G, Strømsheim MD, Cavalca F, Zhu S, Shavorskiy A, Schnadt J, Knudsen J. Following the Kinetics of Undercover Catalysis with APXPS and the Role of Hydrogen as an Intercalation Promoter. ACS Catal 2022. [DOI: 10.1021/acscatal.2c00803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Virginia Boix
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, 22362 Lund, Sweden
- NanoLund, Lund University, 22362 Lund, Sweden
| | | | - Tamires Gallo
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, 22362 Lund, Sweden
| | - Giulio D’Acunto
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, 22362 Lund, Sweden
- NanoLund, Lund University, 22362 Lund, Sweden
| | - Marie Døvre Strømsheim
- Department of Chemical Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | | | - Suyun Zhu
- MAX IV Laboratory, Lund University, 22484 Lund, Sweden
| | | | - Joachim Schnadt
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, 22362 Lund, Sweden
- MAX IV Laboratory, Lund University, 22484 Lund, Sweden
- NanoLund, Lund University, 22362 Lund, Sweden
| | - Jan Knudsen
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, 22362 Lund, Sweden
- MAX IV Laboratory, Lund University, 22484 Lund, Sweden
- NanoLund, Lund University, 22362 Lund, Sweden
| |
Collapse
|
4
|
de Lara-Castells MP. First-principles modelling of the new generation of subnanometric metal clusters: Recent case studies. J Colloid Interface Sci 2022; 612:737-759. [PMID: 35033919 DOI: 10.1016/j.jcis.2021.12.186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/28/2021] [Accepted: 12/29/2021] [Indexed: 10/19/2022]
Abstract
The very recent development of highly selective techniques making possible the synthesis and experimental characterization of subnanometric (subnanometer-sized) metal clusters (even single atoms) is pushing our understanding far beyond the present knowledge in materials science, driving these clusters as a new generation of quantum materials at the lower bounds of nanotechnology. When the size of the metal cluster is reduced to a small number of atoms, the d-band of the metal splits into a subnanometric d-type molecular orbitals network in which all metal atoms are inter-connected, with the inter-connections having the length of a chemical bond (1-2 Å). These molecular characteristics are at the very core of the high stability and novel properties of the smallest metal clusters, with their integration into colloidal materials interacting with the environment having the potential to further boost their performance in applications such as luminescence, sensing, bioimaging, theranostics, energy conversion, catalysis, and photocatalysis. Through the presentation of very recent case studies, this Feature Article is aimed to illustrate how first-principles modelling, including methods beyond the state-of-the-art and an interplay with cutting-edge experiments, is helping to understand the special properties of these clusters at the most fundamental level. Moreover, it will be discussed how superfluid helium droplets can act both as nano-reactors and carriers to achieve the synthesis and surface deposition of metal clusters. This concept will be illustrated with the quantum simulation of the helium droplet-assisted soft-landing of a single Au atom onto a titanium dioxide (TiO2) surface. Next, it will be shown how the application of first-principles methods have disclosed the fundamental reasons why subnanometric Cu5 clusters are resistant to irreversible oxidation, and capable of increasing and extending into the visible region the solar absorption of TiO2, of augmenting its efficiency for photo-catalysis beyond a factor of four, also considering the decomposition and photo-activation of CO2 as a prototypical (photo-) catalytic reaction. Finally, I will discuss how the modification of the same material with subnanometric Ag5 clusters has converted it into a "reporter" of a surface polaron property as well as a novel two-dimensional polaronic material.
Collapse
|
5
|
Politano A. On the fate of high-resolution electron energy loss spectroscopy (HREELS), a versatile probe to detect surface excitations: will the Phoenix rise again? Phys Chem Chem Phys 2021; 23:26061-26069. [PMID: 34812442 DOI: 10.1039/d1cp03804d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
From its advent, high-resolution electron energy loss spectroscopy (HREELS) has emerged as one of the most versatile tools in surface science. In the last few decades, HREELS was widely used for the fundamental study of (i) chemical reactions at the surfaces of model catalysts (mostly single crystals), (ii) lattice dynamics (phonons), (iii) surface plasmons and (iv) magnons. However, HREELS has experienced a continuous decay of the number of daily users worldwide so far, due to several factors. However, the rise of Dirac materials (graphene, topological insulators, Dirac semimetals) offers new perspectives for HREELS, due to its unique features enabling ultrasensitive detection of (i) chemical modifications at their surfaces, (ii) Kohn anomalies arising from electron-phonon coupling and (iii) novel plasmonic excitations associated to Dirac-cone fermions, as well as their eventual mutual interplay with other plasmon resonances related to topologically trivial electronic states. By selected case-study examples, here we show that HREELS can uniquely probe these phenomena in Dirac materials, thus validating its outstanding relevance and its irreplaceability in contemporary solid-state physics, thus paving the way for a renewed interest. In addition, recent technological upgrades enable the combination of HREELS as an add-on to photoemission apparatuses for parallel readout of energy and momentum of surface excitations. Open issues for theoretical modelling of HREELS related to the dependence on primary electron beam energy and scattering geometry are also critically presented.
Collapse
Affiliation(s)
- Antonio Politano
- Department of Physical and Chemical Sciences, University of L'Aquila, via Vetoio, 67100 L'Aquila, Abruzzo, Italy. .,CNR-IMM Istituto per la Microelettronica e Microsistemi, VIII strada 5, I-95121 Catania, Italy
| |
Collapse
|
6
|
Apostol NG, Bucur IC, Lungu GA, Tache CA, Teodorescu CM. CO adsorption and oxidation at room temperature on graphene synthesized on atomically clean Pt(001). Catal Today 2021. [DOI: 10.1016/j.cattod.2020.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
7
|
Kumar J, Shrivastava M. Stone-Wales Defect and Vacancy-Assisted Enhanced Atomic Orbital Interactions Between Graphene and Ambient Gases: A First-Principles Insight. ACS OMEGA 2020; 5:31281-31288. [PMID: 33324838 PMCID: PMC7726964 DOI: 10.1021/acsomega.0c04729] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Accepted: 11/04/2020] [Indexed: 05/14/2023]
Abstract
Graphene has magnificent fundamental properties for its application in various fields. However, these fundamental properties have been observed to get perturbed by various agents like intrinsic defects and ambient gases. Degradation as well as p-type behavior of graphene under an ambient atmosphere are some of the properties that have not yet been explored extensively. In this work, interactions of different ambient gases, like N2, O2, Ar, CO2, and H2O, with pristine and defective graphene are studied using density functional theory (DFT) computations. It is observed that while the pristine graphene is chemically and physically inert with ambient gases, except for oxygen, its interaction with these ambient gases increases significantly in the presence of carbon vacancies and Stone-Wales (SW) defects. We report that Ar and N2 are apparently not inert with defective graphene, as they also influence its fundamental properties like band structure, mid gap (trap) states, and Fermi energy level. We have also found that while oxygen makes pristine graphene p-type, the phenomenon amplifies in the presence of SW defects. Besides, in the presence of carbon vacancies, N2, H2O, and CO2 also make the graphene monolayer p-type. Among ambient gases, oxygen is the real performance and reliability killer for graphene. Its reaction is seeded by a carbon vacancy, which initiates its degradation by local formation of graphene oxide.
Collapse
|
8
|
Wei A, Lahkar S, Li X, Li S, Ye H. Multilayer Graphene-Based Thermal Rectifier with Interlayer Gradient Functionalization. ACS APPLIED MATERIALS & INTERFACES 2019; 11:45180-45188. [PMID: 31746588 DOI: 10.1021/acsami.9b11762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
As a counterpart of electrical and optical diodes with asymmetric transmission properties, the nanoscale thermal rectifier has attracted huge attention. Graphene has been expected as the most promising candidate for the design and fabrication of high-performance thermal rectifiers. However, most reported graphene-based thermal rectification has been achieved only within the plane of the graphene layer, and the efficiency is heavily limited by the lateral size, restricting the potential applications. In this paper, we propose a design of multilayer graphene-based thermal rectifier (MGTR) with interlayer gradient functionalization. A unique thermal rectification along the vertical direction without lateral size limitation is demonstrated by molecular dynamics simulations. The heat flux prefers to transport from a fully hydrogenated graphene layer to a pristine graphene layer. The analysis of phonon density of states reveals that the mismatch between dominant frequency domains plays a crucial role in the vertical thermal rectification phenomenon. The impacts of temperature and strain on the rectification efficiency are systematically investigated, and we verify the interlayer welding process as an effective approach to eliminate the degradation induced by out-of-plane compression. In addition, compared with uniform hydrogenation at average H-coverage, an anomalous enhancement of in-plane thermal conductivity of multilayer graphene with interlayer gradient hydrogenation is observed. The proposed MGTR has great potential in designing devices for heat management and logic control.
Collapse
Affiliation(s)
- Anran Wei
- State Key Laboratory of Information Photonics and Optical Communications , Beijing University of Posts and Telecommunications , Beijing 100876 , China
- Department of Mechanical Engineering , The Hong Kong Polytechnic University , Hong Hum, Kowloon 999077 , Hong Kong
| | | | | | | | - Han Ye
- State Key Laboratory of Information Photonics and Optical Communications , Beijing University of Posts and Telecommunications , Beijing 100876 , China
- Department of Materials Science and Engineering , Monash University , Clayton , VIC 3800 , Australia
| |
Collapse
|
9
|
Diao L, Zhang B, Sun Q, Wang N, Zhao N, Shi C, Liu E, He C. An in-plane Co 9S 8@MoS 2 heterostructure for the hydrogen evolution reaction in alkaline media. NANOSCALE 2019; 11:21479-21486. [PMID: 31686061 DOI: 10.1039/c9nr06609h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Transition metal sulfides have emerged as promising hydrogen evolution reaction (HER) electrocatalysts in acidic media due to high intrinsic activity. They exhibit inferior HER activity in alkaline media, however, owing to the sluggish water dissociation kinetics. Herein, in-plane MoS2/Co9S8 heterostructures are in situ grown on three-dimensional carbon network substrates with interconnected hierarchical pores by one-step pyrolysis to enhance the alkaline HER activity. The experiment results reveal that the HER kinetics of MoS2 is accelerated after the construction of heterostructures. The synthesized MoS2/Co9S8 heterostructures anchored on a three-dimensional interconnected hierarchical pore carbon network exhibit a lower overpotential of 177 mV than MoS2 (252 mV) at 10 mA cm-2 for the HER in 1 M KOH. The enhanced catalytic performance is mainly attributed to the accelerated water dissociation kinetics on the interface of MoS2 and Co9S8. In combination with DFT calculations, it is revealed that assembling the interface construction synergistically favors the chemisorption of protons and the cleavage of the O-H bonds of the H2O molecule, thus accelerating the kinetics of the HER. Moreover, the three-dimensional interconnected hierarchical pore carbon (3DC) network structure is beneficial for the circulation of the electrolyte and H2 spillover. This study demonstrates the present strategy as a facile route for fabricating efficient HER catalysts.
Collapse
Affiliation(s)
- Lechen Diao
- School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China.
| | - Biao Zhang
- School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China.
| | - Qiaozhi Sun
- School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China.
| | - Ning Wang
- School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China.
| | - Naiqin Zhao
- School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China. and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China and Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University, Tianjin, 300072, China
| | - Chunsheng Shi
- School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China.
| | - Enzuo Liu
- School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China. and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Chunnian He
- School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China. and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China and Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University, Tianjin, 300072, China
| |
Collapse
|
10
|
Improvement of Photocatalytic H2-Generation under Visible Light Irradiation by Controlling the Band Gap of ZnIn2S4 with Cu and In. Catalysts 2019. [DOI: 10.3390/catal9080681] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The band gap controlled photocatalyst (Zn0.74Cu0.13In2S3.805) was prepared via a simple one-step solvothermal method. The effects of doping of Cu+ and excess In on the photocatalytic activity of ZnIn2S4 photocatalyst were investigated. In addition, optical properties, surface morphology and crystal structure were evaluated. The maximum H2 evolution rate (2370 µmol h−1 g−1) was achieved with Zn0.74Cu0.13In2S3.805, which was about five times higher than that of untreated ZnIn2S4 under visible light (λ ≥ 420 nm). The band gap of Zn0.74Cu0.13In2S3.805 decreased to 1.98 eV by raising the maximum position of the valence band, compared to ZnIn2S4. Furthermore, the recombination of electron hole pairs was effectively reduced. This research contributes to the development of highly active photocatalysts under visible light.
Collapse
|
11
|
Gontarek E, Macedonio F, Militano F, Giorno L, Lieder M, Politano A, Drioli E, Gugliuzza A. Adsorption-assisted transport of water vapour in super-hydrophobic membranes filled with multilayer graphene platelets. NANOSCALE 2019; 11:11521-11529. [PMID: 31086934 DOI: 10.1039/c9nr02581b] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The effects of confinement of multilayer graphene platelets in hydrophobic microporous polymeric membranes are here examined. Intermolecular interactions between water vapour molecules and nanocomposite membranes are envisaged to originate assisted transport of water vapour in membrane distillation processes when a suitable filler-polymer ratio is reached. Mass transport coefficients are estimated under different working conditions, suggesting a strong dependence of the transport on molecular interactions. Remarkably, no thermal polarization is observed, although the filler exhibits ultrahigh thermal conductivity. In contrast, enhanced resistance to wetting as well as outstanding mechanical and chemical stability meets the basic requirements of water purification via membrane distillation. As a result, a significant improvement of the productivity-efficiency trade-off is achieved with respect to the pristine polymeric membrane when low amounts of platelets are confined in spherulitic-like PVDF networks.
Collapse
Affiliation(s)
- E Gontarek
- Research Institute on Membrane Technology, ITM-CNR, Via Pietro Bucci 17/C, I-87030 Rende, Italy.
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Liu H, Hu X, Guo H, Zhao J, Li F, Zhu D, Liu S. One-step reducing and dispersing graphene oxide via hydroxypropyl hydrazine and its applications in Cu 2+ removal. Phys Chem Chem Phys 2019; 21:10947-10954. [PMID: 31099364 DOI: 10.1039/c9cp01648a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Graphene is widely used in numerous scientific fields including physics, chemistry and materials science due to its exceptional electrical, thermal, optical and mechanical properties. However, the poor solubility/dispersibility strongly limits the practical applications of graphene. In this work, hydroxypropyl hydrazine (HPH) was synthesized to reduce graphene oxide (GO) under mild conditions. The as-produced graphene sheets with a 3D-porous structure show admirable dispersion stability in N,N-dimethylacetamide (DMAc) and the graphene sheets are more effective absorbents for Cu2+ removal than those reduced by hydrazine hydrate. A mechanism for removal of epoxides and carboxides from GO by HPH has been proposed. This one-step reducing and dispersing process of GO is more efficient, environmentally benign and safer for the bulk-scale production of 3D porous graphene.
Collapse
Affiliation(s)
- Haohao Liu
- College of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo City, Shandong Province 255049, P. R. China.
| | - Xinxin Hu
- College of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo City, Shandong Province 255049, P. R. China.
| | - Haiquan Guo
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
| | - Jianying Zhao
- College of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo City, Shandong Province 255049, P. R. China.
| | - Furong Li
- College of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo City, Shandong Province 255049, P. R. China.
| | - Deshuai Zhu
- College of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo City, Shandong Province 255049, P. R. China.
| | - Shaomin Liu
- Department of Chemical Engineering, Curtin University, Perth, WA 6845, Australia.
| |
Collapse
|
13
|
Recent Progress on Metal Sulfide Composite Nanomaterials for Photocatalytic Hydrogen Production. Catalysts 2019. [DOI: 10.3390/catal9050457] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Metal sulfide-based photocatalysts have gained much attention due to their outstanding photocatalytic properties. This review paper discusses recent developments on metal sulfide-based nanomaterials for H2 production, acting as either photocatalysts or cocatalysts, especially in the last decade. Recent progress on key experimental parameters, in-situ characterization methods, and the performance of the metal sulfide photocatalysts are systematically discussed, including the forms of heterogeneous composite photocatalysts, immobilized photocatalysts, and magnetically separable photocatalysts. Some methods have been studied to solve the problem of rapid recombination of photoinduced carriers. The electronic density of photocatalysts can be investigated by in-situ C K-edge near edge X-ray absorption fine structure (NEXAFS) spectra to study the mechanism of the photocatalytic process. The effects of crystal properties, nanostructure, cocatalyst, sacrificial agent, electrically conductive materials, doping, calcination, crystal size, and pH on the performance of composite photocatalysts are presented. Moreover, the facet effect and light trapping (or light harvesting) effect, which can improve the photocatalytic activity, are also discussed.
Collapse
|
14
|
Lizzit D, Trioni MI, Bignardi L, Lacovig P, Lizzit S, Martinazzo R, Larciprete R. Dual-Route Hydrogenation of the Graphene/Ni Interface. ACS NANO 2019; 13:1828-1838. [PMID: 30633501 DOI: 10.1021/acsnano.8b07996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nanostructured architectures based on graphene/metal interfaces might be efficiently exploited in hydrogen storage due to the attractive capability to provide adsorption sites both at the top side of graphene and at the metal substrate after intercalation. We combined in situ high-resolution X-ray photoelectron spectroscopy and scanning tunneling microscopy with theoretical calculations to determine the arrangement of hydrogen atoms at the graphene/Ni(111) interface at room temperature. Our results show that at low coverage H atoms predominantly adsorb as monomers and that chemisorption saturates when ∼25% of the surface is hydrogenated. In parallel, with a much lower rate, H atoms intercalate below graphene and bind to Ni surface sites. Intercalation progressively destabilizes the C-H bonds and triggers the release of the hydrogen chemisorbed on graphene. Valence band and near-edge absorption spectroscopy demonstrate that the graphene layer is fully lifted when the Ni surface is saturated with H. Thermal programmed desorption was used to determine the stability of the hydrogenated interface. Whereas the H atoms chemisorbed on graphene remain unperturbed over a wide temperature range, the intercalated phase abruptly desorbs 50-100 K above room temperature.
Collapse
Affiliation(s)
- Daniel Lizzit
- Elettra-Sincrotrone Trieste S.C.p.A. , AREA Science Park , S.S. 14 km 163.5, 34149 Trieste , Italy
| | - Mario I Trioni
- CNR-Institute of Molecular Science and Technologies (ISTM) , Via Golgi 19 , 20133 Milano , Italy
| | - Luca Bignardi
- Elettra-Sincrotrone Trieste S.C.p.A. , AREA Science Park , S.S. 14 km 163.5, 34149 Trieste , Italy
| | - Paolo Lacovig
- Elettra-Sincrotrone Trieste S.C.p.A. , AREA Science Park , S.S. 14 km 163.5, 34149 Trieste , Italy
| | - Silvano Lizzit
- Elettra-Sincrotrone Trieste S.C.p.A. , AREA Science Park , S.S. 14 km 163.5, 34149 Trieste , Italy
| | - Rocco Martinazzo
- Dipartimento di Chimica , Università degli Studi di Milano , Via Golgi 19 , 20133 Milano , Italy
| | - Rosanna Larciprete
- CNR-Institute for Complex Systems (ISC) , Via dei Taurini 19 , 00185 Roma , Italy
| |
Collapse
|
15
|
Sun L, Xiang X, Wu J, Cai C, Ao D, Luo J, Tian C, Zu X. Bi-Metal Phosphide NiCoP: An Enhanced Catalyst for the Reduction of 4-Nitrophenol. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E112. [PMID: 30669296 PMCID: PMC6359086 DOI: 10.3390/nano9010112] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Accepted: 01/09/2019] [Indexed: 01/31/2023]
Abstract
Porous phosphide NixCoyP composite nanomaterials are successfully synthesized at different Ni/Co ratios (=0, 0.5, 1, and 2) to reduce 4-nitrophenol. The X-ray diffraction and X-ray photoelectron spectroscopy results demonstrate that the products are CoP, NiCoP/CoP, NiCoP, and NiCoP/Ni₂P when the Ni/Co ratio is 0, 0.5, 1, and 2, respectively. The products exhibit different catalytic performance for reduction of 4-nitrophenol at room temperature. Among them, the pure NiCoP delivers a better catalytic efficiency with k app = 677.4 × 10 - 2 min - 1 and k = 338.7 ( Lg - 1 min - 1 ) , due to the synergy between Ni and Co atoms. The sequence of catalytic efficiency of different samples is CoP < NiCoP/CoP < NiCoP/Ni₂P < NiCoP.
Collapse
Affiliation(s)
- Lijie Sun
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
| | - Xia Xiang
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
| | - Juwei Wu
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
| | - Chao Cai
- Institute of Fundamental and Frontier Science, University of Electronic Science and Technology of China, Chengdu 610054, China.
| | - Dongyi Ao
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
| | - Jinling Luo
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
| | - Chengxiang Tian
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
| | - Xiaotao Zu
- Institute of Fundamental and Frontier Science, University of Electronic Science and Technology of China, Chengdu 610054, China.
| |
Collapse
|
16
|
In Situ Regeneration of Alumina-Supported Cobalt–Iron Catalysts for Hydrogen Production by Catalytic Methane Decomposition. Catalysts 2018. [DOI: 10.3390/catal8110567] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
A novel approach to the in situ regeneration of a spent alumina-supported cobalt–iron catalyst for catalytic methane decomposition is reported in this work. The spent catalyst was obtained after testing fresh catalyst in catalytic methane decomposition reaction during 90 min. The regeneration evaluated the effect of forced periodic cycling; the cycles of regeneration were performed in situ at 700 °C under diluted O2 gasifying agent (10% O2/N2), followed by inert treatment under N2. The obtained regenerated catalysts at different cycles were tested again in catalytic methane decomposition reaction. Fresh, spent, and spent/regenerated materials were characterized using X-ray powder diffraction (XRD), transmission electron microscopy (TEM), laser Raman spectroscopy (LRS), N2-physisorption, H2-temperature programmed reduction (H2-TPR), thermogravimetric analysis (TGA), and atomic absorption spectroscopy (AAS). The comparison of transmission electron microscope and X-ray powder diffraction characterizations of spent and spent/regenerated catalysts showed the formation of a significant amount of carbon on the surface with a densification of catalyst particles after each catalytic methane decomposition reaction preceded by regeneration. The activity results confirm that the methane decomposition after regeneration cycles leads to a permanent deactivation of catalysts certainly provoked by the coke deposition. Indeed, it is likely that some active iron sites cannot be regenerated totally despite the forced periodic cycling.
Collapse
|
17
|
Politano A, Chiarello G, Ghosh B, Sadhukhan K, Kuo CN, Lue CS, Pellegrini V, Agarwal A. 3D Dirac Plasmons in the Type-II Dirac Semimetal PtTe_{2}. PHYSICAL REVIEW LETTERS 2018; 121:086804. [PMID: 30192568 DOI: 10.1103/physrevlett.121.086804] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Indexed: 06/08/2023]
Abstract
Transition-metal dichalcogenides showing type-II Dirac fermions are emerging as innovative materials for nanoelectronics. However, their excitation spectrum is mostly unexplored yet. By means of high-resolution electron energy loss spectroscopy and density functional theory, here, we identify the collective excitations of type-II Dirac fermions (3D Dirac plasmons) in PtTe_{2} single crystals. The observed plasmon energy in the long-wavelength limit is ∼0.5 eV, which makes PtTe_{2} suitable for near-infrared optoelectronic applications. We also demonstrate that interband transitions between the two Dirac bands in PtTe_{2} give rise to additional excitations at ∼1 and ∼1.4 eV. Our results are crucial to bringing to fruition type-II Dirac semimetals in optoelectronics.
Collapse
Affiliation(s)
- Antonio Politano
- Istituto Italiano di Tecnologia-Graphene Labs via Morego, 30 16163 Genova, Italy
| | - Gennaro Chiarello
- Department of Physics, University of Calabria, via ponte Bucci, cubo 31/C 87036, Rende (CS), Italy
| | - Barun Ghosh
- Department of Physics, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Krishanu Sadhukhan
- Department of Physics, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Chia-Nung Kuo
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road 70101 Tainan, Taiwan
| | - Chin Shan Lue
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road 70101 Tainan, Taiwan
| | - Vittorio Pellegrini
- Istituto Italiano di Tecnologia-Graphene Labs via Morego, 30 16163 Genova, Italy
| | - Amit Agarwal
- Department of Physics, Indian Institute of Technology Kanpur, Kanpur-208016, India
| |
Collapse
|
18
|
Agnoli S. Interfacial Chemistry of Low‐Dimensional Systems for Applications in Nanocatalysis. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800730] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Stefano Agnoli
- Department of Chemical Sciences and INSTM Research Unit University of Padova Via F. Marzolo 1 35131 Padova Italy
| |
Collapse
|
19
|
Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production. Catalysts 2018. [DOI: 10.3390/catal8080322] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Several Ni catalysts of supported (on La2O3-αAl2O3, CeO2, and CeO2-ZrO2) or bulk types (Ni-La perovskites and NiAl2O4 spinel) have been tested in the oxidative steam reforming (OSR) of raw bio-oil, and special attention has been paid to the catalysts’ regenerability by means of studies on reaction-regeneration cycles. The experimental set-up consists of two units in series, for the separation of pyrolytic lignin in the first step (at 500 °C) and the on line OSR of the remaining oxygenates in a fluidized bed reactor at 700 °C. The spent catalysts have been characterized by N2 adsorption-desorption, X-ray diffraction and temperature programmed reduction, and temperature programmed oxidation (TPO). The results reveal that among the supported catalysts, the best balance between activity-H2 selectivity-stability corresponds to Ni/La2O3-αAl2O3, due to its smaller Ni0 particle size. Additionally, it is more selective to H2 than perovskite catalysts and more stable than both perovskites and the spinel catalyst. However, the activity of the bulk NiAl2O4 spinel catalyst can be completely recovered after regeneration by coke combustion at 850 °C because the spinel structure is completely recovered, which facilitates the dispersion of Ni in the reduction step prior to reaction. Consequently, this catalyst is suitable for the OSR at a higher scale in reaction-regeneration cycles.
Collapse
|
20
|
Satta M, Lacovig P, Apostol N, Dalmiglio M, Orlando F, Bignardi L, Bana H, Travaglia E, Baraldi A, Lizzit S, Larciprete R. The adsorption of silicon on an iridium surface ruling out silicene growth. NANOSCALE 2018; 10:7085-7094. [PMID: 29616265 DOI: 10.1039/c8nr00648b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The adsorption of Si atoms on a metal surface might proceed through complex surface processes, whose rate is determined differently by factors such as temperature, Si coverage, and metal cohesive energy. Among other transition metals, iridium is a special case since the Ir(111) surface was reported first, in addition to Ag(111), as being suitable for the epitaxy of silicene monolayers. In this study we followed the adsorption of Si on the Ir(111) surface via high resolution core level photoelectron spectroscopy, starting from the clean metal surface up to a coverage exceeding one monolayer, in a temperature range between 300 and 670 K. Density functional theory calculations were carried out in order to evaluate the stability of the different Si adsorption configurations as a function of the coverage. Results indicate that, at low coverage, the Si adatoms tend to occupy the hollow Ir sites, although a small fraction of them penetrates the first Ir layer. Si penetration of the Ir surface can take place if the energy gained upon Si adsorption is used to displace the Ir surface atoms, rather then being dissipated differently. At a Si coverage of ∼1 monolayer, the Ir 4f spectrum indicates that not only the metal surface but also the layers underneath are perturbed. Our results point out that the Si/Ir(111) interface is unstable towards Si-Ir intermixing, in agreement with the silicide phase formation reported in the literature for the reverted interface.
Collapse
Affiliation(s)
- Mauro Satta
- CNR-Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), Department of Chemistry, Sapienza University, P.le Aldo Moro 5, 00185, Roma, Italy
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Datteo M, Liu H, Di Valentin C. Water on Graphene-Coated TiO 2: Role of Atomic Vacancies. ACS APPLIED MATERIALS & INTERFACES 2018; 10:5793-5804. [PMID: 29368503 PMCID: PMC5916463 DOI: 10.1021/acsami.7b18087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Beyond two-dimensional (2D) materials, interfaces between 2D materials and underlying supports or 2D-coated metal or metal oxide nanoparticles exhibit excellent properties and promising applications. The hybrid interface between graphene and anatase TiO2 shows great importance in photocatalytic, catalytic, and nanomedical applications due to the excellent and complementary properties of the two materials. Water, as a ubiquitous and essential element in practical conditions and in the human body, plays a significant role in the applications of graphene/TiO2 composites for both electronic devices and nanomedicine. Carbon vacancies, as common defects in chemically prepared graphene, also need to be considered for the application of graphene-based materials. Therefore, the behavior of water on top and at the interface of defective graphene on anatase TiO2 surface was systematically investigated by dispersion-corrected hybrid density functional calculations. The presence of the substrate only slightly enhances the on-top adsorption and reduces the on-top dissociation of water on defective graphene. However, at the interface, dissociated water is largely preferred compared with undissociated water on bare TiO2 surface, showing a prominent cover effect. Reduced TiO2 may further induce oxygen diffusion into the bulk. Our results are helpful to understand how the presence of water in the surrounding environment affects structural and electronic properties of the graphene/TiO2 interface and thus its application in photocatalysis, electronic devices, and nanomedicine.
Collapse
|
22
|
Long-Term Corrosion Protection of a Cupro-Nickel Alloy Due to Graphene Coating. COATINGS 2017. [DOI: 10.3390/coatings7120210] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
23
|
Ferrighi L, Perilli D, Selli D, Di Valentin C. Water at the Interface Between Defective Graphene and Cu or Pt (111) Surfaces. ACS APPLIED MATERIALS & INTERFACES 2017; 9:29932-29941. [PMID: 28795791 DOI: 10.1021/acsami.7b06633] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The presence of defects in the graphenic layers deposited on metal surfaces modifies the nature of the interaction. Unsaturated carbon atoms, due to vacancies in the lattice, form strong organometallic bonds with surface metal atoms that highly enhance the binding energy between the two materials. We investigate by means of a wide set of dispersion-corrected density functional theory calculations how such strong chemical bonds affect both the electronic properties of these hybrid interfaces and the chemical reactivity with water, which is commonly present in the working conditions. We compare different metal substrates (Cu vs Pt) that present a different type of interaction with graphene and with defective graphene. This comparative analysis allows us to unravel the controlling factors of water reactivity, the role played by the carbon vacancies and by the confinement or "graphene cover effect". Water is capable of breaking the C-Cu bond by dissociating at the undercoordinated carbon atom of the vacancy, restoring the weak van der Waals type of interaction between the two materials that allows for an easy detachment of graphene from the metal, but the same is not true in the case of Pt, where C-Pt bonds are much stronger. These conclusions can be used to rationalize water reactivity at other defective graphene/metal interfaces.
Collapse
Affiliation(s)
- Lara Ferrighi
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca , via Cozzi 55, 20125 Milano, Italy
| | - Daniele Perilli
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca , via Cozzi 55, 20125 Milano, Italy
| | - Daniele Selli
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca , via Cozzi 55, 20125 Milano, Italy
| | - Cristiana Di Valentin
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca , via Cozzi 55, 20125 Milano, Italy
| |
Collapse
|
24
|
Abstract
A novel graphene-coated Ni electrode was developed in this investigation to improve corrosion resistance while unexpectedly enhancing the ammonia generation rate in the electrochemically induced urea to ammonia (eU2A) process, which is an electrochemical onsite ammonia generation method. The development of the electrode is crucial for the eU2A reactions since in the ammonia generation process, the concentration of ammonia is inevitably high on the surface of the electrode, leading to severe corrosion of the electrode and the loss of generated ammonia as well. In this paper, the graphene was derived from raw coal by using the chemical vapor deposition method and self-lifted onto a Ni electrode to form a protective layer for corrosion prevention. Transmission electron microscopy showed the synthesized graphene had few-layers and Raman spectroscopy indicated that the coating of graphene was stable during the eU2A reaction. As a result, the ammonia corrosion of the Ni electrode was dramatically reduced by ~20 times with the graphene coating method. More importantly, a higher ammonia generation rate (~2 times) was achieved using the graphene-coated Ni working electrode compared to a bare Ni electrode in the eU2A process.
Collapse
|
25
|
Iwasaki T, Muruganathan M, Schmidt ME, Mizuta H. Partial hydrogenation induced interaction in a graphene-SiO 2 interface: irreversible modulation of device characteristics. NANOSCALE 2017; 9:1662-1669. [PMID: 28074959 DOI: 10.1039/c6nr08117g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The transformation of systematic vacuum and hydrogen annealing effects in graphene devices on the SiO2 surface is reported based on experimental and van der Waals interaction corrected density functional theory (DFT) simulation results. Vacuum annealing removes p-type dopants and reduces charged impurity scattering in graphene. Moreover, it induces n-type doping into graphene, leading to the improvement of the electron mobility and conductivity in the electron transport regime, which are reversed by exposing to atmospheric environment. On the other hand, annealing in hydrogen/argon gas results in smaller n-type doping along with a decrease in the overall conductivity and carrier mobility. This degradation of the conductivity is irreversible even the graphene devices are exposed to ambience. This was clarified by DFT simulations: initially, silicon dangling bonds were partially terminated by hydrogen, subsequently, the remaining dangling bonds became active and the distance between the graphene and SiO2 surface decreased. Moreover, both annealing methods affect the graphene channel including the vicinity of the metal contacts, which plays an important role in asymmetric carrier transport.
Collapse
Affiliation(s)
- Takuya Iwasaki
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
| | - Manoharan Muruganathan
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
| | - Marek E Schmidt
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
| | - Hiroshi Mizuta
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan. and Nanoelectronics and Nanotechnology Research Group, University of Southampton, Highfield, Southampton SO17 1BJ, UK and Institute of Microengineering and Nanoelectronics (IMEN), The National University of Malaysia, 43600 Bangi, Selangor, Malaysia
| |
Collapse
|
26
|
Fu Q, Bao X. Surface chemistry and catalysis confined under two-dimensional materials. Chem Soc Rev 2017; 46:1842-1874. [DOI: 10.1039/c6cs00424e] [Citation(s) in RCA: 292] [Impact Index Per Article: 41.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Interfaces between 2D material overlayers and solid surfaces provide confined spaces for chemical processes, which have stimulated new chemistry under a 2D cover.
Collapse
Affiliation(s)
- Qiang Fu
- State Key Laboratory of Catalysis
- iChEM
- Dalian Institute of Chemical Physics, the Chinese Academy of Sciences
- Dalian 116023
- P. R. China
| | - Xinhe Bao
- State Key Laboratory of Catalysis
- iChEM
- Dalian Institute of Chemical Physics, the Chinese Academy of Sciences
- Dalian 116023
- P. R. China
| |
Collapse
|
27
|
Abstract
Gas diffusion on graphene surfaces is a two-dimensional gas behavior, controlled not by the hopping mechanism but by molecular collisions.
Collapse
Affiliation(s)
- Chengzhen Sun
- State Key Laboratory of Multiphase Flow in Power Engineering
- Xi'an Jiaotong University
- Shaanxi 710049
- China
| | - Bofeng Bai
- State Key Laboratory of Multiphase Flow in Power Engineering
- Xi'an Jiaotong University
- Shaanxi 710049
- China
| |
Collapse
|
28
|
Kronberg R, Hakala M, Holmberg N, Laasonen K. Hydrogen adsorption on MoS2-surfaces: a DFT study on preferential sites and the effect of sulfur and hydrogen coverage. Phys Chem Chem Phys 2017; 19:16231-16241. [DOI: 10.1039/c7cp03068a] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
H-Adsorption on MoS2-surfaces is studied as a function of structural parameters and an assessment of the intricate structure–property relations is conducted.
Collapse
Affiliation(s)
- Rasmus Kronberg
- Research Group of Computational Chemistry
- Department of Chemistry and Materials Science
- Aalto University
- P.O. Box 16100
- FI-00076 Aalto
| | - Mikko Hakala
- Research Group of Computational Chemistry
- Department of Chemistry and Materials Science
- Aalto University
- P.O. Box 16100
- FI-00076 Aalto
| | - Nico Holmberg
- Research Group of Computational Chemistry
- Department of Chemistry and Materials Science
- Aalto University
- P.O. Box 16100
- FI-00076 Aalto
| | - Kari Laasonen
- Research Group of Computational Chemistry
- Department of Chemistry and Materials Science
- Aalto University
- P.O. Box 16100
- FI-00076 Aalto
| |
Collapse
|
29
|
Gao L, Fu Q, Wei M, Zhu Y, Liu Q, Crumlin E, Liu Z, Bao X. Enhanced Nickel-Catalyzed Methanation Confined under Hexagonal Boron Nitride Shells. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02188] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lijun Gao
- Department
of Chemical Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China
- State
Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
| | - Qiang Fu
- State
Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
| | - Mingming Wei
- State
Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
| | - Yifeng Zhu
- State
Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
| | - Qiang Liu
- State
Key Laboratory of Functional Materials for Informatics, Shanghai Institute
of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
- School
of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, People’s Republic of China
| | - Ethan Crumlin
- Advanced
Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron
Road, Berkeley, California 94720, United States
| | - Zhi Liu
- State
Key Laboratory of Functional Materials for Informatics, Shanghai Institute
of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
- School
of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, People’s Republic of China
| | - Xinhe Bao
- State
Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
| |
Collapse
|