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Silviya R, Bhide A, Gupta S, Bhabal R, Mali KH, Bhagat BR, Spreitzer M, Dashora A, Patel N, Fernandes R. Bifunctional Amorphous Transition-Metal Phospho-Boride Electrocatalysts for Selective Alkaline Seawater Splitting at a Current Density of 2A cm -2. SMALL METHODS 2024:e2301395. [PMID: 38282459 DOI: 10.1002/smtd.202301395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 01/09/2024] [Indexed: 01/30/2024]
Abstract
Hydrogen production by direct seawater electrolysis is an alternative technology to conventional freshwater electrolysis, mainly owing to the vast abundance of seawater reserves on earth. However, the lack of robust, active, and selective electrocatalysts that can withstand the harsh and corrosive saline conditions of seawater greatly hinders its industrial viability. Herein, a series of amorphous transition-metal phospho-borides, namely Co-P-B, Ni-P-B, and Fe-P-B are prepared by simple chemical reduction method and screened for overall alkaline seawater electrolysis. Co-P-B is found to be the best of the lot, requiring low overpotentials of ≈270 mV for hydrogen evolution reaction (HER), ≈410 mV for oxygen evolution reaction (OER), and an overall voltage of 2.50 V to reach a current density of 2 A cm-2 in highly alkaline natural seawater. Furthermore, the optimized electrocatalyst shows formidable stability after 10,000 cycles and 30 h of chronoamperometric measurements in alkaline natural seawater without any chlorine evolution, even at higher current densities. A detailed understanding of not only HER and OER but also chlorine evolution reaction (ClER) on the Co-P-B surface is obtained by computational analysis, which also sheds light on the selectivity and stability of the catalyst at high current densities.
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Affiliation(s)
- R Silviya
- Department of Physics and Electronics, Christ University, Bengaluru, 560029, India
| | - Aniruddha Bhide
- Department of Physics and Electronics, Christ University, Bengaluru, 560029, India
| | - Suraj Gupta
- Advanced Materials Department, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia
| | - Rinkoo Bhabal
- Department of Physics and Electronics, Christ University, Bengaluru, 560029, India
| | - Kishan H Mali
- Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India
| | - Brajesh Rajesh Bhagat
- Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India
| | - Matjaž Spreitzer
- Advanced Materials Department, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia
| | - Alpa Dashora
- Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India
| | - Nainesh Patel
- Department of Physics and Electronics, Christ University, Bengaluru, 560029, India
| | - Rohan Fernandes
- Department of Physics and Electronics, Christ University, Bengaluru, 560029, India
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C, N co-doped Mesoporous Co-based Phosphates via Glucose-mediated Regulation for the Selective Electrochemical Water Oxidation in Alkaline Realistic Seawater. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Wang S, Zhao R, Zheng T, Fang Y, Wang W, Xue W. Metal-organic framework-derived self-supporting metal boride for efficient electrocatalytic oxygen evolution reaction. J Colloid Interface Sci 2022; 618:34-43. [DOI: 10.1016/j.jcis.2022.03.067] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/13/2022] [Accepted: 03/15/2022] [Indexed: 11/25/2022]
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