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Saad A, Gao Y, Owusu KA, Liu W, Wu Y, Ramiere A, Guo H, Tsiakaras P, Cai X. Ternary Mo 2 NiB 2 as a Superior Bifunctional Electrocatalyst for Overall Water Splitting. Small 2022; 18:e2104303. [PMID: 35142066 DOI: 10.1002/smll.202104303] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/16/2021] [Indexed: 06/14/2023]
Abstract
Transition metal borides are considered as promising electrocatalysts for water splitting due to their metallic conductivity and good durability. However, the currently reported monometallic and noncrystalline multimetallic borides only show generic and monofunctional catalytic activity. In this work, the authors design and successfully synthesize highly crystalline ternary borides, Mo2 NiB2 , via a facile solid-state reaction from pure elemental powders. The as-synthesized Mo2 NiB2 exhibits very low overpotentials for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), that is, 280 and 160 mV to reach a current density of 10 mA cm-2 , in alkaline media. These values are much lower from the ones observed over monometallic borides, that is, Ni2 B and MoB, and the lowest among all nonprecious metal borides. By loading Mo2 NiB2 onto Ni foams as both cathode and anode electrode for overall water splitting applications, a low cell voltage of 1.57 V is required to achieve a current density of 10 mA cm-2 , comparable with the value required from the Pt/C||IrO2 /C couple (1.56 V). The proposed synthesis strategy can be used for the preparation of cost-effective, multi-metallic crystalline borides, as multifunctional electrocatalysts.
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Affiliation(s)
- Ali Saad
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Yang Gao
- College of Materials Science and Engineering, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, 410082, PR China
| | - Kwadwo Asare Owusu
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Wei Liu
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Yanyan Wu
- School of Science, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Aymeric Ramiere
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Haichuan Guo
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
| | - Panagiotis Tsiakaras
- Laboratory of Alternative Energy Conversion Systems, Department of Mechanical Engineering, School of Engineering, University of Thessaly, 1 Sekeri Str., Pedion Areos, 38834, Greece
- Laboratory of Materials and Devices for Clean Energy, Department of Technology of Electrochemical Processes, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation
- Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry (RAS), Yekaterinburg, 620990, Russian Federation
| | - Xingke Cai
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
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