1
|
Huang JF, Hsieh WJ, Chen JL. Carbon-Promoted Pt-Single Atoms Anchored on RuO 2 Nanorods to Boost Electrochemical Hydrogen Evolution. ACS Appl Mater Interfaces 2024. [PMID: 38758608 DOI: 10.1021/acsami.4c06033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2024]
Abstract
While efficient for electrochemical hydrogen evolution reaction (HER), Pt is limited by its cost and rarity. Traditional Pt catalysts and Pt single-atom (aPt) catalysts (Pt-SACs) face challenges in maintaining kinetically favorable HER pathways (Volmer-Tafel) at ultralow Pt loadings. Herein, carbon-promoted aPts were deposited on RuO2 without the addition of reductants. aPts confined on carbon-supported RuO2 nanorods (aPt/RuO2NR/Carbon) promoted "inter-aPts" Tafel. aPt/RuO2NR/Carbon is the Pt-SAC that retained underpotentially deposited H; additionally, its HER onset overpotential was "negative". The aPt/RuO2NR/Carbon exhibited 260-fold higher Pt mass activity (imPt)/turnover frequency (TOF) (522.7 A mg-1/528.4 s-1) than that of commercial Pt/C (1.9 A mg-1/1.9 s-1). In an ultralow Pt loading (0.19 μg cm-2), the HER rate-determining step maintained Volmer-Tafel and the Pt utilization efficiency was 100.3%.
Collapse
Affiliation(s)
- Jing-Fang Huang
- A Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan (R.O.C)
| | - Wen-Jun Hsieh
- A Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan (R.O.C)
| | - Jeng-Lung Chen
- National Synchrotron Radiation Research Center, Science-Based Industrial Park, Hsinchu30076, Taiwan (R.O.C)
| |
Collapse
|
2
|
Chang JW, Su KH, Pao CW, Tsai JJ, Su CJ, Chen JL, Lyu LM, Kuo CH, Su AC, Yang HC, Lai YH, Jeng US. Arrayed Pt Single Atoms via Phosphotungstic Acids Intercalated in Silicate Nanochannels for Efficient Hydrogen Evolution Reactions. ACS Nano 2024; 18:1611-1620. [PMID: 38166379 PMCID: PMC10795682 DOI: 10.1021/acsnano.3c09656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/07/2023] [Accepted: 12/12/2023] [Indexed: 01/04/2024]
Abstract
Single-atom catalysts, known for their high activity, have garnered significant interest. Currently, single-atom catalysts were prepared mainly on 2D substrates with random distribution. Here, we report a strategy for preparing arrayed single Pt (Pt1) atoms, which are templated through coordination with phosphotungstic acids (PTA) intercalated inside hexagonally packed silicate nanochannels for a high single Pt-atom loading of ca. 3.0 wt %. X-ray absorption spectroscopy, high-angle annular dark-field scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy, in conjunction with the density-functional theory calculation, collectively indicate that the Pt single atoms are stabilized via a four-oxygen coordination on the PTA within the nanochannels' inner walls. The critical reduction in the Pt-adsorption energy to nearly the cohesive energy of Pt clustering is attributed to the interaction between PTA and the silicate substrate. Consequently, the transition from single-atom dispersion to clustering of Pt atoms can be controlled by adjusting the number density of PTA intercalated within the silicate nanochannels, specifically when the number ratio of Pt atoms to PTA changes from 3.7 to 18. The 3D organized Pt1-PTA pairs, facilitated by the arrayed silicate nanochannels, demonstrate high and stable efficiency with a hydrogen production rate of ca. 300 mmol/h/gPt─approximately twice that of the best-reported Pt efficiency in polyoxometalate-based photocatalytic systems.
Collapse
Affiliation(s)
- Je-Wei Chang
- Department
of Chemical Engineering, National Tsing
Hua University, Hsinchu 300044, Taiwan
- National
Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 300092, Taiwan
| | - Kuan-Hsuan Su
- Department
of Chemistry, Fu Jen Catholic University, New Taipei City 241037, Taiwan
| | - Chih-Wen Pao
- National
Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 300092, Taiwan
| | - Jin-Jia Tsai
- Department
of Chemistry, Tunghai University, Taichung 407302, Taiwan
| | - Chun-Jen Su
- National
Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 300092, Taiwan
| | - Jeng-Lung Chen
- National
Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 300092, Taiwan
| | - Lian-Ming Lyu
- Department
of Applied Chemistry, National Yang Ming
Chiao Tung University, Hsinchu 300093, Taiwan
| | - Chun-Hong Kuo
- Department
of Applied Chemistry, National Yang Ming
Chiao Tung University, Hsinchu 300093, Taiwan
| | - An-Chung Su
- Department
of Chemical Engineering, National Tsing
Hua University, Hsinchu 300044, Taiwan
| | - Hsiao-Ching Yang
- Department
of Chemistry, Fu Jen Catholic University, New Taipei City 241037, Taiwan
| | - Ying-Huang Lai
- Department
of Chemistry, Tunghai University, Taichung 407302, Taiwan
| | - U-Ser Jeng
- Department
of Chemical Engineering, National Tsing
Hua University, Hsinchu 300044, Taiwan
- National
Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 300092, Taiwan
- College
of
Semiconductor Research, National Tsing Hua
University, Hsinchu 300044, Taiwan
| |
Collapse
|
3
|
Chen WL, Lee TW, Chen C. Polypyrrole-induced active-edge-S and high-valence-Mo reinforced composites with boosted electrochemical performance for the determination of 2,4,6-trichlorophenol in the aquatic environment. Chemosphere 2023:139003. [PMID: 37224980 DOI: 10.1016/j.chemosphere.2023.139003] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/08/2023] [Accepted: 05/20/2023] [Indexed: 05/26/2023]
Abstract
With the extensive application of halogenated aromatic compounds, including 2,4,6-Trichlorophenol (2,4,6-TCP), improper treatment or discharge contribute to persistently harmful effects on humans and the ecosystem, rendering the identification and monitoring of 2,4,6-TCP in the aquatic environment urgently required. In this study, a highly sensitive electrochemical platform was developed using active-edge-S and high-valence-Mo rich MoS2/polypyrrole composites. MoS2/PPy illustrates superior electrochemical performance and catalytic activity and has not been explored for detecting chlorinated phenols previously. The local environment of polypyrrole induces the richness of active edge S and a high oxidation state of Mo species in the composites, both of which endorse a sensitive anodic current response due to the favored oxidation of 2,4,6-TCP through nucleophilic substitution. Also, the higher complementarity between pyrrole and 2,4,6-TCP with respective electron-rich and electron-poor features through π-π stacking interactions enhances the specific detection capability of 2,4,6-TCP by the MoS2/polypyrrole-modified electrode. The MoS2/polypyrrole-modified electrode achieved a linear range of 0.1-260 μM with an ultralow limit of detection of 0.009 μM. Additionally, the structural stability boosted by the linkage of polypyrrole and MoS2 results in good resistance and satisfactory recovery in real water samples. The compiled results demonstrate that the proposed MoS2/polypyrrole composite opens up a new potential to advance a sensitive, selective, facile fabrication, and low-cost platform for the on-site determination of 2,4,6-TCP in aquatic systems. The sensing of 2,4,6-TCP is important to monitor its occurrence and transport, and can also serve to track the effectiveness and adjust subsequent remediation treatments applied to contaminated sites.
Collapse
Affiliation(s)
- Wei-Ling Chen
- Department of Environmental Engineering, National Chung Hsing University, Taichung City, 402, Taiwan
| | - Ting-Wei Lee
- Department of Environmental Engineering, National Chung Hsing University, Taichung City, 402, Taiwan
| | - Chiaying Chen
- Department of Environmental Engineering, National Chung Hsing University, Taichung City, 402, Taiwan.
| |
Collapse
|
4
|
Tananonchai A, Tang M, Pao C, Sampanpanish P, Tanthanuch W, Tancharakorn S. The study of EDTA enhanced Cd accumulation and formation in Napier grass using synchrotron μX-ray fluorescence imaging and X-ray absorption spectroscopy. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2023.110851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
|
5
|
Lee TW, Lai YH, Chen JL, Chen C. The role of transformation in the risks of chemically exfoliated molybdenum disulfide nanosheets to the aquatic environment. J Environ Manage 2022; 324:116278. [PMID: 36174469 DOI: 10.1016/j.jenvman.2022.116278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 08/28/2022] [Accepted: 09/12/2022] [Indexed: 06/16/2023]
Abstract
While the effects of environmental factors (e.g., coexisting organic macromolecules and solar irradiation) on the phase transformation and oxidative dissolution of chemically exfoliated molybdenum nanosheets (ceMoS2) have been recognized, the effects of environmental processes on the subsequent biological impacts of ceMoS2 are still poorly understood. In this study, the bioavailability and transitions in chemical speciation occurring during the aging process are demonstrated to be key factors causing ceMoS2 to affect aquatic organisms. The lower survival rate of embryonic zebrafish with aged (i.e., sunlight-irradiated and dark-ambient-aged) ceMoS2, compared to that with freshly prepared ceMoS2, was due to the release of ionic aging products (mainly acidic Mo species) throughout the oxidative dissolution of ceMoS2. The released soluble molybdenum interacted with natural organic matter (NOM) depending on their functionality, and this attenuated the toxicity caused by ceMoS2 to different degrees. Toxicity triggered by aged ceMoS2 under both dark and irradiated conditions was significantly reduced by Suwannee River NOM due to the formation of complexes with ionic Mo species, which was established by Mo K-edge X-ray absorption spectroscopy. The findings provide useful insights for comprehending the impacts of ceMoS2 on aquatic organisms and guidance for the prevention measures necessary in the applications of MoS2 nanosheets.
Collapse
Affiliation(s)
- Ting-Wei Lee
- Department of Environmental Engineering, National Chung Hsing University, Taichung City, 402, Taiwan
| | - Yu-Heng Lai
- Department of Chemistry, Chinese Culture University, Taipei, 111, Taiwan
| | - Jeng-Lung Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Chiaying Chen
- Department of Environmental Engineering, National Chung Hsing University, Taichung City, 402, Taiwan.
| |
Collapse
|
6
|
Wang LC, Chang LC, Chen WQ, Chien YH, Chang PY, Pao CW, Liu YF, Sheu HS, Su WP, Yeh CH, Yeh CS. Atomically dispersed golds on degradable zero-valent copper nanocubes augment oxygen driven Fenton-like reaction for effective orthotopic tumor therapy. Nat Commun 2022; 13:7772. [PMID: 36522345 PMCID: PMC9755215 DOI: 10.1038/s41467-022-35515-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 12/08/2022] [Indexed: 12/16/2022] Open
Abstract
Herein, we employ a galvanic replacement approach to create atomically dispersed Au on degradable zero-valent Cu nanocubes for tumor treatments on female mice. Controlling the addition of precursor HAuCl4 allows for the fabrication of different atomic ratios of AuxCuy. X-ray absorption near edge spectra indicates that Au and Cu are the predominant oxidation states of zero valence. This suggests that the charges of Au and Cu remain unchanged after galvanic replacement. Specifically, Au0.02Cu0.98 composition reveals the enhanced •OH generation following O2 → H2O2 → •OH. The degradable Au0.02Cu0.98 released Cu+ and Cu2+ resulting in oxygen reduction and Fenton-like reactions. Simulation studies indicate that Au single atoms boot zero-valent copper to reveal the catalytic capability of Au0.02Cu0.98 for O2 → H2O2 → •OH as well. Instead of using endogenous H2O2, H2O2 can be sourced from the O2 in the air through the use of nanocubes. Notably, the Au0.02Cu0.98 structure is degradable and renal-clearable.
Collapse
Affiliation(s)
- Liu-Chun Wang
- grid.64523.360000 0004 0532 3255Department of Chemistry, National Cheng Kung University, Tainan, 701 Taiwan
| | - Li-Chan Chang
- grid.64523.360000 0004 0532 3255Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, 704 Taiwan
| | - Wen-Qi Chen
- grid.64523.360000 0004 0532 3255Department of Chemistry, National Cheng Kung University, Tainan, 701 Taiwan
| | - Yi-Hsin Chien
- grid.411298.70000 0001 2175 4846Department of Materials Science and Engineering, Feng Chia University, Taichung, 40724 Taiwan
| | - Po-Ya Chang
- grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan
| | - Chih-Wen Pao
- grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan
| | - Yin-Fen Liu
- grid.64523.360000 0004 0532 3255Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, 704 Taiwan
| | - Hwo-Shuenn Sheu
- grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan
| | - Wen-Pin Su
- grid.64523.360000 0004 0532 3255Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, 704 Taiwan ,grid.64523.360000 0004 0532 3255Departments of Oncology and Internal Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, 704 Taiwan
| | - Chen-Hao Yeh
- grid.411298.70000 0001 2175 4846Department of Materials Science and Engineering, Feng Chia University, Taichung, 40724 Taiwan
| | - Chen-Sheng Yeh
- grid.64523.360000 0004 0532 3255Department of Chemistry, National Cheng Kung University, Tainan, 701 Taiwan
| |
Collapse
|
7
|
Zhou Y, Gu S, Zhao Y, Jiang Z, Zhang Z. A new QEXAFS system on the general XAFS beamline at the Shanghai Synchrotron Radiation Facility. J Synchrotron Radiat 2022; 29:1446-1453. [PMID: 36345753 PMCID: PMC9641573 DOI: 10.1107/s1600577522008177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 08/15/2022] [Indexed: 06/16/2023]
Abstract
A new quick-scanning extended X-ray absorption fine-structure (QEXAFS) system for in situ studies has been developed and tested on the general XAFS beamline at the Shanghai Synchrotron Radiation Facility. In the new system, an analog-to-digital converter (ADC) with 1 MHz sampling rate is used to acquire the detector data while one scaler is used to precisely calculate the scanning energy. Two external hardware trigger signals were adopted to synchronize the data collection of the ADC and the scaler. The software development platforms of the double-crystal monochromator control system and the new QEXAFS system have been unified with the Experimental Physics and Industrial Control System. By comparing the spectra acquired by the conventional step-by-step XAFS system with an energy range of 1200 eV at the 7.5um Cu foil K-edge, the new system demonstrates satisfactory signal-to-noise ratio and energy resolution. The previous shortcomings, including distortion of the spectrum and energy shift, have been overcome. The tests with different integration times indicated that appropriate parameters not only ensure good experimental results but also enhance the smoothness of the XAFS spectrum at high energy zones. The reliability of the new system has also been verified.
Collapse
Affiliation(s)
- Yongnian Zhou
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, People’s Republic of China
| | - Songqi Gu
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, People’s Republic of China
| | - Ying Zhao
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, People’s Republic of China
| | - Zheng Jiang
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, People’s Republic of China
| | - Zhaohong Zhang
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, People’s Republic of China
| |
Collapse
|
8
|
Zabilska A, Clark AH, Ferri D, Nachtegaal M, Kröcher O, Safonova OV. Beware of beam damage under reaction conditions: X-ray induced photochemical reduction of supported VO x catalysts during in situ XAS experiments. Phys Chem Chem Phys 2022; 24:21916-21926. [PMID: 36069029 PMCID: PMC9641748 DOI: 10.1039/d2cp02721f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 08/20/2022] [Indexed: 11/04/2023]
Abstract
In situ X-ray absorption spectroscopy (XAS) is a powerful technique for the investigation of heterogeneous catalysts and electrocatalysts. The obtained XAS spectra are usually interpreted from the point of view of the investigated chemical processes, thereby sometimes omitting the fact that intense X-ray irradiation may induce additional transformations in metal speciation and, thus, in the corresponding XAS spectra. In this work, we report on X-ray induced photochemical reduction of vanadium in supported vanadia (VOx) catalysts under reaction conditions, detected at a synchrotron beamline. While this process was not observed in an inert atmosphere and in the presence of water vapor, it occurred at room temperature in the presence of a reducing agent (ethanol or hydrogen) alone or mixed with oxygen. Temperature programmed experiments have shown that X-ray induced reduction of VOx species appeared very clear at 30-100 °C but was not detected at higher temperatures, where the thermocatalytic ethanol oxidative hydrogenation (ODH) takes place. Similar to other studies on X-ray induced effects, we suggest approaches, which can help to mitigate vanadium photoreduction, including defocusing of the X-ray beam and attenuation of the X-ray beam intensity by filters. To recognize beam damage under in situ/operando conditions, we suggest performing X-ray beam switching (on and off) tests at different beam intensities under in situ conditions.
Collapse
Affiliation(s)
- Anna Zabilska
- Paul Scherrer Institute, 5232 Villigen, Switzerland.
- École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Adam H Clark
- Paul Scherrer Institute, 5232 Villigen, Switzerland.
| | - Davide Ferri
- Paul Scherrer Institute, 5232 Villigen, Switzerland.
| | | | - Oliver Kröcher
- Paul Scherrer Institute, 5232 Villigen, Switzerland.
- École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | | |
Collapse
|
9
|
Luo X, Patra J, Chuang W, Nguyen TX, Ting J, Li J, Pao C, Chang J. Charge-Discharge Mechanism of High-Entropy Co-Free Spinel Oxide Toward Li + Storage Examined Using Operando Quick-Scanning X-Ray Absorption Spectroscopy. Adv Sci (Weinh) 2022; 9:e2201219. [PMID: 35618569 PMCID: PMC9313486 DOI: 10.1002/advs.202201219] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/25/2022] [Indexed: 06/15/2023]
Abstract
Transition metal high-entropy oxides (HEOs) are an attractive class of anode materials for high-performance lithium-ion batteries (LIBs). However, owing to the multiple electroactive centers of HEOs, the Li+ storage mechanism is complex and debated in the literature. In this work, operando quick-scanning X-ray absorption spectroscopy (XAS) is used to study the lithiation/delithiation mechanism of the Cobalt-free spinel (CrMnFeNiCu)3 O4 HEO. A monochromator oscillation frequency of 2 Hz is used and 240 spectra are integrated to achieve a 2 min time resolution. High-photon-flux synchrotron radiation is employed to increase the XAS sensitivity. The results indicate that the Cu2+ and Ni2+ cations are reduced to their metallic states during lithiation but their oxidation reactions are less favorable compared to the other elements upon delithiation. The Mn2+/3+ and Fe2+/3+ cations undergo two-step conversion reactions to form metallic phases, with MnO and FeO as the intermediate species, respectively. During delithiation, the oxidation of Mn occurs prior to that of Fe. The Cr3+ cations are reduced to CrO and then Cr0 during lithiation. A relatively large overpotential is required to activate the Cr reoxidation reaction. The Cr3+ cations are found after delithiation. These results can guide the material design of HEOs for improving LIB performance.
Collapse
Affiliation(s)
- Xu‐Feng Luo
- National Synchrotron Radiation Research Center, Hsin‐Ann RoadHsinchu Science ParkHsinchu30076Taiwan
| | - Jagabandhu Patra
- Department of Materials Science and EngineeringNational Yang Ming Chiao Tung University1001 University RoadHsinchu30010Taiwan
- Hierarchical Green‐Energy Materials (Hi‐GEM) Research CenterNational Cheng Kung University1 University RoadTainan70101Taiwan
| | - Wei‐Tsung Chuang
- National Synchrotron Radiation Research Center, Hsin‐Ann RoadHsinchu Science ParkHsinchu30076Taiwan
| | - Thi Xuyen Nguyen
- Department of Materials Science and EngineeringNational Cheng Kung University1 University RoadTainan70101Taiwan
| | - Jyh‐Ming Ting
- Department of Materials Science and EngineeringNational Cheng Kung University1 University RoadTainan70101Taiwan
| | - Ju Li
- Department of Nuclear Science and Engineering and Department of Materials Science and EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
| | - Chih‐Wen Pao
- National Synchrotron Radiation Research Center, Hsin‐Ann RoadHsinchu Science ParkHsinchu30076Taiwan
| | - Jeng‐Kuei Chang
- Department of Materials Science and EngineeringNational Yang Ming Chiao Tung University1001 University RoadHsinchu30010Taiwan
- Hierarchical Green‐Energy Materials (Hi‐GEM) Research CenterNational Cheng Kung University1 University RoadTainan70101Taiwan
| |
Collapse
|
10
|
Shelke AR, Wang HT, Chiou JW, Shown I, Sabbah A, Chen KH, Teng SA, Lin IA, Lee CC, Hsueh HC, Liang YH, Du CH, Yadav PL, Ray SC, Hsieh SH, Pao CW, Tsai HM, Chen CH, Chen KH, Chen LC, Pong WF. Bandgap Shrinkage and Charge Transfer in 2D Layered SnS 2 Doped with V for Photocatalytic Efficiency Improvement. Small 2022; 18:e2105076. [PMID: 34799991 DOI: 10.1002/smll.202105076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/28/2021] [Indexed: 06/13/2023]
Abstract
Effects of electronic and atomic structures of V-doped 2D layered SnS2 are studied using X-ray spectroscopy for the development of photocatalytic/photovoltaic applications. Extended X-ray absorption fine structure measurements at V K-edge reveal the presence of VO and VS bonds which form the intercalation of tetrahedral OVS sites in the van der Waals (vdW) gap of SnS2 layers. X-ray absorption near-edge structure (XANES) reveals not only valence state of V dopant in SnS2 is ≈4+ but also the charge transfer (CT) from V to ligands, supported by V Lα,β resonant inelastic X-ray scattering. These results suggest V doping produces extra interlayer covalent interactions and additional conducting channels, which increase the electronic conductivity and CT. This gives rapid transport of photo-excited electrons and effective carrier separation in layered SnS2 . Additionally, valence-band photoemission spectra and S K-edge XANES indicate that the density of states near/at valence-band maximum is shifted to lower binding energy in V-doped SnS2 compare to pristine SnS2 and exhibits band gap shrinkage. These findings support first-principles density functional theory calculations of the interstitially tetrahedral OVS site intercalated in the vdW gap, highlighting the CT from V to ligands in V-doped SnS2 .
Collapse
Affiliation(s)
- Abhijeet R Shelke
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| | - Hsiao-Tsu Wang
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| | - Jau-Wern Chiou
- Department of Applied Physics, National University of Kaohsiung, Kaohsiung, 811726, Taiwan
| | - Indrajit Shown
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
- Department of Chemistry, Hindustan Institute of Technology and Science, Chennai, 603103, India
| | - Amr Sabbah
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
- Department of Chemistry, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Kuang-Hung Chen
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
| | - Shu-Ang Teng
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| | - I-An Lin
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| | - Chi-Cheng Lee
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| | - Hung-Chung Hsueh
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| | - Yu-Hui Liang
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| | - Chao-Hung Du
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| | - Priyanka L Yadav
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
- Department of Physics, Shivaji University, Kolhapur, 416004, India
| | - Sekhar C Ray
- Department of Physics, CSET, University of South Africa, Johannesburg, 1710, South Africa
| | - Shang-Hsien Hsieh
- Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Chih-Wen Pao
- Experimental Facility Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Huang-Ming Tsai
- Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Chia-Hao Chen
- Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Kuei-Hsien Chen
- Center for Condensed Matter Sciences, National Taiwan University, Taipei, 10617, Taiwan
| | - Li-Chyong Chen
- Center for Condensed Matter Sciences, National Taiwan University, Taipei, 10617, Taiwan
| | - Way-Faung Pong
- Department of Physics, Tamkang University, New Taipei City, 251301, Taiwan
| |
Collapse
|
11
|
Hsieh PA, Chen PJ, Lyu LM, Chen SY, Tseng MC, Chung MY, Chiang WH, Chen JL, Kuo CH. Enhanced Production of Formic Acid in Electrochemical CO 2 Reduction over Pd-Doped BiOCl Nanosheets. ACS Appl Mater Interfaces 2021; 13:58799-58808. [PMID: 34859991 DOI: 10.1021/acsami.1c20009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Bismuth oxyhalides (BiOX, X = F, Cl, Br, I) are emerging energy materials because of their remarkable catalytic activity. The BiOX compounds usually have a tetragonal type crystal structure with unique layered morphology consisting of [X-Bi-O-Bi-X] sheets. Although the BiOX nanosheets exposed with {001} facets perform superior photoactivity, there is lack of understanding about their capability in the electrochemical CO2 reduction reaction (CO2RR). Herein, we adopt wet-chemical syntheses to make 2D BiOCl and Pd-doped BiOCl nanosheets for CO2RR. In the results, formic acid is the only one kind of product converted from CO2 along with H2 gas from water reduction over both BiOCl and Pd-doped BiOCl nanosheets. By thorough analyses with ex situ and in situ spectroscopy, the results reflect that (1) metallic Bi0 atoms generated by the applied negative potentials serve as the catalytic sites for the hydrogen evolution reaction (HER) and CO2RR and (2) the existence of doped Pd ions in the BiOCl structure reduces the barrier of charge transfer over the nanosheets, which enhances HER and CO2RR activities. We believe that the observations are important references for making catalysts toward CO2RR performance.
Collapse
Affiliation(s)
- Pin-An Hsieh
- Institute of Chemistry, Academia Sinica, Taipei 115201, Taiwan
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
| | - Peng-Jen Chen
- Physical Division, National Center for Theoretical Sciences, Hsinchu 300044, Taiwan
| | - Lian-Ming Lyu
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Sheng-Yu Chen
- Institute of Chemistry, Academia Sinica, Taipei 115201, Taiwan
| | - Mei-Chun Tseng
- Institute of Chemistry, Academia Sinica, Taipei 115201, Taiwan
- Department of Chemistry, Soochow University, Taipei 100006, Taiwan
| | - Mei-Ying Chung
- Institute of Chemistry, Academia Sinica, Taipei 115201, Taiwan
| | - Wei-Hung Chiang
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
| | - Jeng-Lung Chen
- National Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
| | - Chun-Hong Kuo
- Institute of Chemistry, Academia Sinica, Taipei 115201, Taiwan
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
| |
Collapse
|