1
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Li J, Lv Y, Wu X, Xue R, Yang Z, Guo J, Jia D. Electronic and vacancy engineering of ruthenium doped hollow-structured NiO/Co 3O 4 nanoreactors for low-barrier electrochemical urea-assisted energy-saving hydrogen production. J Colloid Interface Sci 2025; 683:600-611. [PMID: 39742741 DOI: 10.1016/j.jcis.2024.12.197] [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: 08/27/2024] [Revised: 12/22/2024] [Accepted: 12/24/2024] [Indexed: 01/04/2025]
Abstract
Discovering a valid approach to achieve a novel and efficient water splitting catalyst is essential for the development of hydrogen energy technology. Herein, unique hollow-structured ruthenium (Ru)-doped nickel-cobalt oxide (Ru-NiO/Co3O4/NF) nanocube arrays are fabricated as high-efficiency bifunctional electrocatalysts for hydrogen evolution reaction (HER)/urea oxidation reaction (UOR) through combined electronic and vacancy engineering. The structural characterization and experimental results indicate that the doping of Ru can not only effectively modulate the electronic structure of Ru-NiO/Co3O4/NF, but also increase the content of oxygen vacancies in the structure of Ru-NiO/Co3O4/NF to stabilize the existence of oxygen vacancies during the catalytic process. This can optimize the adsorption and desorption of the reactive intermediates on the surface of Ru-NiO/Co3O4/NF and dramatically accelerate the HER and UOR kinetics. As a result, the Ru-NiO/Co3O4/NF hollow structure nanocube arrays exhibit overpotentials of 21 and 60 mV for HER, as well as potentials of 1.36 and 1.42 V for UOR at 10 and 100 mA cm-2, respectively. Furthermore, the coupled HER and UOR system requires only 1.59 V of cell voltage to drive a current density of 100 mA cm-2, which is approximately 240 mV lower than conventional water electrolysis. This work provides a tremendous promise for the development of novel and high-activity electrocatalysts in future energy conversion applications.
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Affiliation(s)
- Jiaxin Li
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Yan Lv
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Xueyan Wu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Rui Xue
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Zhuojun Yang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Jixi Guo
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China.
| | - Dianzeng Jia
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China.
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2
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Bib Khan J, Kumar Panda P, Dash P, Hsieh CT. Microwave-Assisted Synthesis of Platinum-free High-Entropy Alloy Catalysts on Reduced Graphene Oxide Sheets for Enhanced Oxygen Reduction and Evolution Reactions. Chemistry 2025; 31:e202403863. [PMID: 39715008 DOI: 10.1002/chem.202403863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2024] [Revised: 12/18/2024] [Accepted: 12/18/2024] [Indexed: 12/25/2024]
Abstract
Nano-sized high-entropy materials (HEMs) recently received more attention to researchers due to their superior electrochemical catalytic properties. HEMs comprise at least five elements with or without metals and are synthesized through solid-state reactions and solution-mediated techniques. The presence of many elements in these HEMs result in a high mixing entropy and facilitates the formation of stable solid solutions in fundamental crystal structures. Herein, Pt-free high-entropy alloys (HEAs) were synthesized through facile and straightforward pulse microwave (PM) synthesis technique, which serve as efficient electrochemical catalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). The PM synthesis method was conducted at an extremely low temperature (100 °C) without any external catalytic reagents. Using this PM technique, Cr18.2Zr13.5Ti5.3Co17.8Ni8.4Cu8.5Fe28.3 and Al15.3Mn18.2Ti3.7Co23.2Ni5.9Cu5.9Fe27.8 HEAs catalysts were synthesized with superior catalytic activity towards OER and ORR and compare its activities with pure Pt catalysts. The as-prepared HEAs also display an anti-CO poisoning effect and long-term durability, as compared to pure Pt catalysts. The low-temperature PM approach not only confirms the feasibility of synthesis of noble metal-free HEAs but also validates their superior catalytic activity towards OER and ORR, which is beneficial for the development of proton exchange membrane fuel cells and proton exchange membrane water electrolysis.
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Affiliation(s)
- Jala Bib Khan
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, 32003, Taiwan
| | - Pradeep Kumar Panda
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, 32003, Taiwan
| | - Pranjyan Dash
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei, 10608, Taiwan
| | - Chien-Te Hsieh
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, 32003, Taiwan
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN, 37996, United States
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3
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Tabassum A, Ata S, Alwadai N, Mnif W, Ali A, Ali A, Nazir A, Iqbal M. L-lysine and surfactant-assisted synthesis of NiCo bimetal oxides for electrochemical water splitting. iScience 2024; 27:110823. [PMID: 39654632 PMCID: PMC11626774 DOI: 10.1016/j.isci.2024.110823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 06/12/2024] [Accepted: 08/22/2024] [Indexed: 12/12/2024] Open
Abstract
In the present study, bimetallic oxides comprising nickel (Ni) and cobalt (Co) were synthesized using a facile hydrothermal method in the presence of CTAB and L-lysine. Their efficacy in catalyzing hydrogen production under alkaline conditions was assessed. Structural, vibrational, and morphological characteristics were analyzed utilizing X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) techniques. The SEM images revealed a needle-like shape which is due to the surfactant addition. The NiCo oxides exhibited the lowest onset potential of 83 mV for HER and 130 mV for OER under standard conditions. The catalysts needed a potential of 286 and 450 mV to attain a current density of 50 mA/cm2 along with Tafel slope values of 119 and 332 mV/dec for HER and OER, respectively. These results suggested that L-lysine as a surfactant is highly effective in the fabrication of NiCo bimetal oxides for electrolytic water splitting applications.
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Affiliation(s)
- Anila Tabassum
- School of Chemistry, University of the Punjab, Lahore 54590, Pakistan
| | - Sadia Ata
- School of Chemistry, University of the Punjab, Lahore 54590, Pakistan
| | - Norah Alwadai
- Department of Physics, College of Sciences, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Wissem Mnif
- Department of Chemistry, Faculty of Sciences at Bisha, University of Bisha, P.O. BOX 199, Bisha 61922, Saudi Arabia
| | - Abid Ali
- Department of Allied Health Sciences, The University of Chenab, Gujarat 50700, Pakistan
| | - Abid Ali
- Department of Chemistry, The University of Lahore, Lahore 54590, Pakistan
| | - Arif Nazir
- Department of Chemistry, The University of Lahore, Lahore 54590, Pakistan
| | - Munawar Iqbal
- School of Chemistry, University of the Punjab, Lahore 54590, Pakistan
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4
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Silva AL, Colaço MV, Liu L, Xing Y, Carvalho NMF. Electrocatalysis of Oxygen Evolution Reaction Promoted by CoNiMn Films Synthesized by Electrodeposition. ACS OMEGA 2024; 9:43503-43512. [PMID: 39493998 PMCID: PMC11525539 DOI: 10.1021/acsomega.4c05057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2024] [Revised: 09/17/2024] [Accepted: 10/02/2024] [Indexed: 11/05/2024]
Abstract
Recently, efforts have been made to address the environmental damage caused by fossil-fuel-based primary energy sources. Interest in efficient technologies for converting and storing energy using renewable sources, especially sunlight, has increased, with the aim of replicating the natural photosynthesis process. However, artificial photosynthesis faces challenges with unfavorable kinetics and thermodynamics, requiring the use of stable catalysts for the hydrogen evolution (HER) and oxygen evolution (OER) reactions to generate H2 and O2, respectively. OER is the most prohibitive of the half-reactions by the highly sluggish kinetics. Mixed oxides, particularly those based on first-row transition metals, have shown promising results as catalysts for the OER. This work reports the synthesis of CoNiMn oxide via electrodeposition on fluoride tin oxide followed by electrochemical activation. This approach seeks to explore the synergistic effect between the elements and to produce a catalyst with superior efficiency and stability for the electrocatalysis of the OER compared to the monometallic and bimetallic oxides. The CoNiMn film was structurally and electrochemically characterized. The electrodeposited CoNiMn hybrid films demonstrated low overpotentials compared with standard OER electrocatalysts, with CoNiMn films outperforming all single and bimetallic oxide films. The activated CoNiMn film required an overpotential of 100 mV at 10 mA cm-2 (430 mV at 25 mA cm-2) and Tafel slope of 58 mV dec-1. The film was active for 15 h at 100 mA cm-2 and showed no significant change in morphology and structure after the chronopotentiometry, indicating that it is a promising and cost-effective alternative to enhance the OER activity using abundant elements.
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Affiliation(s)
- Ana Luisa Silva
- Universidade
do Estado do Rio de Janeiro (UERJ), Instituto de Química, Rua São Francisco Xavier,
524, Rio de Janeiro, 20550-900 Rio de Janeiro, Brasil
| | - Marcos V. Colaço
- Universidade
do Estado do Rio de Janeiro (UERJ), Instituto de Física, Rua São Francisco Xavier,
524, Rio de Janeiro, 20550-013 Rio de Janeiro, Brasil
| | - Liying Liu
- Centro
Brasileiro de Pesquisas Físicas (CBPF), Rua Doutor Xavier Sigaud 150, Rio de Janeiro, 22290180 Rio de Janeiro, Brasil
| | - Yutao Xing
- Universidade
Federal Fluminense, Instituto de Física, Niterói, 24210-346 Rio de Janeiro, Brasil
| | - Nakédia M. F. Carvalho
- Universidade
do Estado do Rio de Janeiro (UERJ), Instituto de Química, Rua São Francisco Xavier,
524, Rio de Janeiro, 20550-900 Rio de Janeiro, Brasil
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5
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Raj G, Nandan R, Kumar K, Gorle DB, Mallya AB, Osman SM, Na J, Yamauchi Y, Nanda KK. High entropy alloying strategy for accomplishing quintuple-nanoparticles grafted carbon towards exceptional high-performance overall seawater splitting. MATERIALS HORIZONS 2023; 10:5032-5044. [PMID: 37649459 DOI: 10.1039/d3mh00453h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
High entropy alloys (HEAs), a novel class of material, have been explored in terms of their excellent mechanical properties. Seawater electrolysis is a step towards sustainable production of carbon-neutral fuels such as H2, O2, and industrially demanding Cl2. Herein, we report a practically viable FeCoNiMnCr HEA nanoparticles system grafted on a conductive carbon matrix for promising seawater electrolysis. The comprehensive kinetics analysis of the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and chlorine evolution reaction (CER) confirms the effectiveness of our system. As an electrocatalyst, HEAs grafted on carbon black show trifunctionality with promising kinetics, selectivity and enduring performance, towards seawater splitting. We optimize high entropy alloy decorated/grafted carbon black (HEACB) catalysts, studying their synthesis temperature to scrutinize the effect of alloy formation variation on the catalysis efficacy. During the catalysis, selectivity between two mutually competing reactions, CER and OER, in the electrochemical catalysis of seawater is controlled by the reaction media pH. We employ Mott-Schottky measurements to probe the band structure of the intrinsically induced metal-semiconductor junction in the HEACB catalyst, where the carrier density and flat band potential are optimized. The HEACB sample provides promising results towards overall seawater electrolysis with a net half-cell potential of about 1.65 V with good stability, which strongly implies its broad practical applicability.
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Affiliation(s)
- Gokul Raj
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Ravi Nandan
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Kanhai Kumar
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Demudu Babu Gorle
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Ambresh B Mallya
- Micro Nano Characterization Facility, Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore-560012, India
| | - Sameh M Osman
- Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Jongbeom Na
- Materials Architecturing Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea.
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia
| | - Yusuke Yamauchi
- Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia
- Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Karuna Kar Nanda
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
- Institute of Physics (IOP), Bhubaneshwar-751005, India
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6
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Lu C, Gao Y, An W, Yan C, Yu F, Lu W, Wang C, Huang G. Gas-liquid diffusion directed rational synthesis of Fe-doped NiCo2O4 nanoflower for efficient oxygen evolution reaction. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2022.130783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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7
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Nandan R, Raj G, Nanda KK. FeCoNiMnCr High-Entropy Alloy Nanoparticle-Grafted NCNTs with Promising Performance in the Ohmic Polarization Region of Fuel Cells. ACS APPLIED MATERIALS & INTERFACES 2022; 14:16108-16116. [PMID: 35357120 DOI: 10.1021/acsami.1c21336] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We report a user-friendly methodology for the successful designing of targeted single-phased face-centered cubic (fcc) FeCoNiMnCr high-entropy alloy (HEA) nanoparticle-grafted N-doped carbon nanotubes (CNTs). The nanostructure assimilates the advantages of N-doped carbon and HEA nanoparticles as a core for the efficient promotion of electrochemical oxygen reduction reaction (ORR). It emulates the commercial Pt-C electrocatalyst for ORR and shows promise for better performance in the Ohmic polarization region of fuel cells. In addition, it ensures superior efficacy over those of numerous recently reported transition metal-based traditional alloy composites for ORR. The presented methodology has the potential to pave the way for the effective designing of a variety of targeted HEA systems with ease, which is necessary to widen the domain of HEA for numerous applications.
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Affiliation(s)
- Ravi Nandan
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Gokul Raj
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Karuna K Nanda
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
- Institute of Physics, Bhubaneshwar 751005, India
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8
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Devi HR, Solanki V, Nanda KK. Modulating the Midgap States of 3D–2D Hybrid ZnO by Codoping and Its Effect on Visible Photocatalysis. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hemam Rachna Devi
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Vanaraj Solanki
- Dr. K C Patel R & D Centre, Charotar University of Science & Technology (CHARUSAT), Changa 388 421, Anand, India
| | - Karuna Kar Nanda
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
- Institute of Physics, P.O. Sainik School, Bhubaneswar 751005, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
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9
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Liu M, Wen Y, Lu L, Kang Q, Xie Z, Chen Y, Tian X, Jin H, Liu J. A Cost‐Effective Iron Based Covalent Organic Framework and Its Composite Electrocatalyst for Active and Stable Oxygen Reduction Reaction in Alkaline Solution. ChemElectroChem 2021. [DOI: 10.1002/celc.202100627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Muye Liu
- Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan 430074 P.R.China
| | - Yue Wen
- Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan 430074 P.R.China
| | - Luhua Lu
- Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan 430074 P.R.China
- Zhejiang institute China University of Geosciences Wuhan Hangzhou 6 Heting Street 311305 P. R. China
| | - Qi Kang
- Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan 430074 P.R.China
| | - Zhicheng Xie
- Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan 430074 P.R.China
| | - Ying Chen
- Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan 430074 P.R.China
| | - Xiaocong Tian
- Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan 430074 P.R.China
| | - Hongyun Jin
- Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan 430074 P.R.China
| | - Jinghai Liu
- Inner Mongolia Key Laboratory of Carbon Nanomaterials College of Chemistry and Chemical Engineering Inner Mongolia University for Nationalities Tongliao 536 Huolinhe Street West 028000 P. R. China
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10
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Recent Progresses in Engineering of Ni and Co based Phosphides for Effective Electrocatalytic Water Splitting. ChemElectroChem 2021. [DOI: 10.1002/celc.202100984] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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11
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Wang P, Fu P, Ma J, Gao Y, Li Z, Wang H, Fan F, Shi J, Li C. Ultrathin Cobalt Oxide Interlayer Facilitated Hole Storage for Sustained Water Oxidation over Composited Tantalum Nitride Photoanodes. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03298] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pengpeng Wang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ping Fu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Jiangping Ma
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yuying Gao
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Zheng Li
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Hong Wang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fengtao Fan
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Jingying Shi
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Can Li
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
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12
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Nandan R, Pandey P, Gautam A, Bisen OY, Chattopadhyay K, Titirici MM, Nanda KK. Atomic Arrangement Modulation in CoFe Nanoparticles Encapsulated in N-Doped Carbon Nanostructures for Efficient Oxygen Reduction Reaction. ACS APPLIED MATERIALS & INTERFACES 2021; 13:3771-3781. [PMID: 33438991 DOI: 10.1021/acsami.0c16937] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The properties and, hence, the application of materials are dependent on the way their constituent atoms are arranged. Here, we report a facile approach to produce body-centered cubic (bcc) and face-centered cubic (fcc) phases of bimetallic FeCo crystalline nanoparticles embedded into nitrogen-doped carbon nanotubes (NCNTs) with equal loading and almost similar particle size for both crystalline phases by a rational selection of precursors. The two electrocatalysts with similar composition but different crystalline structures of the encapsulated nanoparticles have allowed us, for the first time, to account for the effect of crystal structure on the overall work function of electrocatalysts and the concomitant correlation with the oxygen reduction reaction (ORR). This study unveils that the electrocatalysts with lower work function show lower activation energy to facilitate the ORR. Importantly, the difference between the ORR activation energy on electrocatalysts and their respective work functions are found to be identical (∼0.2 eV). A notable decrease in the ORR activity after acid treatment indicates the significant role of encapsulated FeCo nanoparticles in influencing the oxygen electrochemistry by modulating the material property of overall electrocatalysts.
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Affiliation(s)
- Ravi Nandan
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Prafull Pandey
- Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
| | - Ajay Gautam
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | | | - Kamanio Chattopadhyay
- Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
- Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore 560012, India
| | | | - Karuna Kar Nanda
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
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13
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Nandan R, Rekha MY, Devi HR, Srivastava C, Nanda KK. High-entropy alloys for water oxidation: a new class of electrocatalysts to look out for. Chem Commun (Camb) 2021; 57:611-614. [PMID: 33346256 DOI: 10.1039/d0cc06485h] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High-entropy alloys (HEAs) with five or more elements can provide near-continuous adsorption energies and can be optimized for superior persistent catalytic activity. This report presents electrochemical water oxidation facilitated by employing graphene and FeCoNiCuCr HEA nanoparticle based composites prepared via the mechanical milling of graphite-metal powders. The composite efficiently facilitates water oxidation with a low overpotential of 330 mV at 10 mA cm-2, and high specific and mass activities (∼143 mA cm-2 and 380 mA mg-1, respectively, at 1.75 V). Importantly, the composites exhibit excellent accelerated cycling stability with ∼99% current retention (after 3250 cycles). The HEA-based composites are anticipated to replace noble/precious metal based traditional electrocatalysts in the future, the use of which is a major obstacle in the technological scalability of electrochemical energy conversion and storage devices.
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Affiliation(s)
- Ravi Nandan
- Materials Research Centre, Indian Institute of Science, Bangalore, India.
| | | | - Hemam Rachna Devi
- Materials Research Centre, Indian Institute of Science, Bangalore, India.
| | | | - Karuna Kar Nanda
- Materials Research Centre, Indian Institute of Science, Bangalore, India.
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14
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Barman BK, Sarkar B, Nandan R, Nanda KK. Ruthenium nanodendrites on reduced graphene oxide: an efficient water and 4-nitrophenol reduction catalyst. NEW J CHEM 2021. [DOI: 10.1039/d0nj05565d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A green and efficient protocol is reported for the elegant design of reduced graphene oxide (rGO)-supported Ru nanodendrites for promotion of electrochemical water reduction in a wide pH range as well as for environmental remediation.
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Affiliation(s)
- Barun Kumar Barman
- Materials Research Centre
- Indian Institute of Science
- Bangalore-560012
- India
| | - Bidushi Sarkar
- Materials Research Centre
- Indian Institute of Science
- Bangalore-560012
- India
| | - Ravi Nandan
- Materials Research Centre
- Indian Institute of Science
- Bangalore-560012
- India
| | - Karuna Kar Nanda
- Materials Research Centre
- Indian Institute of Science
- Bangalore-560012
- India
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15
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Nandan R, Goswami GK, Nanda KK. Energy-Efficient Rational Designing of Multifunctional Nanocomposites by Preferential Anchoring of Metal Ions via Fermi Level Positioning of Carbon Nanostructures. ACS APPLIED MATERIALS & INTERFACES 2020; 12:53749-53759. [PMID: 33207878 DOI: 10.1021/acsami.0c14858] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Despite the availability and dedicated studies on a variety of carbon nanostructures, amorphous carbon is still a preferred support for a wide range of commercially available metal catalysts. In order to shed some light on this, we carried out electroless deposition of metal nanoparticles on various carbon nanostructures such as amorphous carbon (a-C), carbon nanotubes (CNTs), and nitrogen-doped CNTs (NCNTs) under similar experimental conditions. The main objective is to elucidate the preferable deposition on a particular carbon nanostructure, if any, and understand the underlying mechanism. Experimental results unveil preferred electroless deposition of metal nanoparticles on a-C over CNTs and NCNTs. Notably, the deposition is nicely correlated with the position of the Fermi level (EF) with respect to the Mn+ ↔ M0 redox level (E0). Remarkably, EF is found to be in the following order NCNT > CNT > a-C and the smaller gap (E0-EF) favors the faster electron transfer, resulting in the preferential reduction of Mn+, yielding finer nanoparticles on a-C. We believe that this approach can pave the way for designing noble metal-based carbon nanocomposites for a variety of applications, ranging from environmental redemption to electrochemical energy harvesting. As case studies, we have explored the nanocomposites for various catalytic activities and found them to be very competent with recently reported various state-of-the-art electrocatalysts and their commercial counterparts.
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Affiliation(s)
- Ravi Nandan
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | | | - Karuna Kar Nanda
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
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Liu D, Jiang T, Liu D, Zhang W, Qin H, Yan S, Zou Z. Silicon Photoanode Modified with Work-function-tuned Ni@Fe y Ni 1-y (OH) 2 Core-Shell Particles for Water Oxidation. CHEMSUSCHEM 2020; 13:6037-6044. [PMID: 33022839 DOI: 10.1002/cssc.202002049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 10/05/2020] [Indexed: 06/11/2023]
Abstract
The photoelectrochemical (PEC) water splitting determines by the light absorption and charge extraction/injection. Here, we dispersedly modified the core-shell structured Ni@Niy Fe1-y (OH)2 on Si photoanodes and in-situ electrochemically converted it to Ni@Niy Fe1-y OOH to form a Si/SiOx /Ni@Niy Fe1-y OOH assembly, exhibiting the adjustable band bending and catalytic ability in water oxidation depending closely on the composition of Niy Fe1-y OOH. Combining with the island-like dispersed distribution to maximize the light absorption and the Ni@Niy Fe1-y shell as a high work function and a catalytic layer to simultaneously enlarge charge extraction and injection, the Si/SiOx /Ni@Ni0.7 Fe0.3 OOH assembly achieved an onset potential of 1.0 VRHE , a saturated current density of 35.4 mA cm-2 and a more than 50 h stability in an electrolyte with pH 9 under AM1.5G simulated sunlight irradiation. Our findings suggested that regulating the charge energetics at Si-electrolyte interface by discontinuously modifying a composition-adjustable core-shell structure is a potential route to develop highly efficient PEC devices.
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Affiliation(s)
- Duanduan Liu
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, No. 22, Hankou Road, Nanjing, Jiangsu, 210093, P. R. China
- Jiangsu Key Laboratory of Artificial Functional Materials, Eco-materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Hankou Road, 22, Nanjing, Jiangsu, 210093, P. R. China
| | - Tong Jiang
- Jiangsu Key Laboratory of Artificial Functional Materials, Eco-materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Hankou Road, 22, Nanjing, Jiangsu, 210093, P. R. China
| | - Depei Liu
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, No. 22, Hankou Road, Nanjing, Jiangsu, 210093, P. R. China
- Jiangsu Key Laboratory of Artificial Functional Materials, Eco-materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Hankou Road, 22, Nanjing, Jiangsu, 210093, P. R. China
| | - Weining Zhang
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, No. 22, Hankou Road, Nanjing, Jiangsu, 210093, P. R. China
- Jiangsu Key Laboratory of Artificial Functional Materials, Eco-materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Hankou Road, 22, Nanjing, Jiangsu, 210093, P. R. China
| | - Hao Qin
- Jiangsu Key Laboratory of Artificial Functional Materials, Eco-materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Hankou Road, 22, Nanjing, Jiangsu, 210093, P. R. China
| | - Shicheng Yan
- Jiangsu Key Laboratory of Artificial Functional Materials, Eco-materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Hankou Road, 22, Nanjing, Jiangsu, 210093, P. R. China
| | - Zhigang Zou
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, No. 22, Hankou Road, Nanjing, Jiangsu, 210093, P. R. China
- Jiangsu Key Laboratory of Artificial Functional Materials, Eco-materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Hankou Road, 22, Nanjing, Jiangsu, 210093, P. R. China
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Bisen OY, Yadav AK, Nanda KK. Self-Organized Single-Atom Tungsten Supported on the N-Doped Carbon Matrix for Durable Oxygen Reduction. ACS APPLIED MATERIALS & INTERFACES 2020; 12:43586-43595. [PMID: 32867468 DOI: 10.1021/acsami.0c10234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Rational engineering of atomically scaled metal-nitrogen-carbon (M-N-C) moieties has been the topic of recent research interest because of their potential application as an electrochemical oxygen reduction reaction (ORR) catalyst. Despite numerous efforts on M-N-Cs, attaining both adequate activity and a satisfactory stability simultaneously is a principal issue. Herein, we demonstrated the synthesis of a single-atom tungsten catalyst supported on the N-doped carbon matrix (W-N-C) and its application as an ORR catalyst. W-N-C was synthesized using the economically viable, simple, one-step pyrolysis of dicyandiamide and tungsten(VI) chloride at moderate temperature (700 °C). The synthesis of W-N-C avoids any post acid treatment as it does not require any subsidiary sacrificial metal like Zn and, hence, does not induce any burden associated with chemical waste management. The atomic dispersion of W atoms stabilized by N-doped porous carbon and the formation of WN2C2 were confirmed by high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption spectroscopy. Interestingly, as-synthesized WN2C2 exhibited unprecedented electrocatalytic activity with a half-wave potential of 764 mV vs reversible hydrogen electrode (RHE) as well as significantly enhanced stability (retaining >99% diffusion-limited current density and the loss in activity is 10.5% at 0.84 V after 10,000 potential cycles), which is much better than the stability limit set by the US Department of Energy in an alkaline medium. Overall, the activity of W-N-C surpasses that of Pt/C after 5000 cycles. The excellent stability is believed to be due to the symmetric coordination of the metal active site (W2N2C2).
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Affiliation(s)
- Omeshwari Y Bisen
- Material Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Ashok Kumar Yadav
- Atomic and Molecular physics division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
| | - Karuna Kar Nanda
- Material Research Centre, Indian Institute of Science, Bangalore 560012, India
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Nandan R, Devi HR, Kumar R, Singh AK, Srivastava C, Nanda KK. Inner Sphere Electron Transfer Promotion on Homogeneously Dispersed Fe-N x Centers for Energy-Efficient Oxygen Reduction Reaction. ACS APPLIED MATERIALS & INTERFACES 2020; 12:36026-36039. [PMID: 32677817 DOI: 10.1021/acsami.0c08086] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The study reports the optimized incorporation of pyridinic nitrogen in nitrogen-doped carbon nanotubes (CNTs) to realize effective Fe-Nx centers throughout the framework. The study unveils nitrogen as a valuable asset to promote the homogeneous dispersion of Fe moieties throughout the CNT framework, which is a necessary component to institute uniform Fe-Nx centers. In addition, pyridinic nitrogen causes disruption in strongly delocalized π-electrons, which impart electron-withdrawing nature in the carbon matrix, resulting in an anodic shift in oxygen reduction reaction (ORR) onset potential (Eonset). The direct interaction of Fe-Nx with O2, as evidenced by poisoning and computational studies, ensures the preferential inner sphere electron transfer mechanism. Despite the alkaline medium, the outer sphere electron transfer mechanism was muted, with suppressed HO2- generation, preferential 4e- reduction pathways, and excellent cyclic stability. The study indicates the dependency of ORR half-wave potential on the electron transfer mechanism. The poisoning study unveils the direct involvement of Fe-Nx electroactive centers in facilitating ORR in alkaline medium. It further indicates a noticable increase (up to ∼25%) in peroxide generation-an unwanted ORR intermediate-and concomitant reduction in average electron transfer no. per oxygen molecule.
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Affiliation(s)
- Ravi Nandan
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Hemam Rachna Devi
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Ritesh Kumar
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | | | - Chandan Srivastava
- Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
| | - Karuna Kar Nanda
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
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