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Fang B, Jin J, Li Y, Dang H, Shao M, Zhao L, Yin N, Wang W. Interfacial Electronic Modulation of Mo 5 N 6 /Ni 3 S 2 Heterojunction Array Boosts Electrocatalytic Alkaline Overall Water Splitting. Small 2024:e2310825. [PMID: 38342581 DOI: 10.1002/smll.202310825] [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] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/21/2024] [Indexed: 02/13/2024]
Abstract
Bifunctional electrocatalysts with excellent activity and durability are highly desirable for alkaline overall water splitting, yet remain a significant challenge. In this contribution, palm-like Mo5 N6 /Ni3 S2 heterojunction arrays anchored in conductive Ni foam (denoted as Mo5 N6 -Ni3 S2 HNPs/NF) are developed. Benefiting from the optimized electronic structure configuration, hierarchical branched structure and abundant heterogeneous interfaces, the as-synthesized Mo5 N6 -Ni3 S2 HNPs/NF electrode exhibits remarkably stable bifunctional electrocatalytic activity in 1 m KOH solution. It only requires ultralow overpotentials of 59 and 190 mV to deliver a current density of 10 mA cm-2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1 m KOH solution, respectively. Importantly, the overall water splitting electrolyzer assembled by Mo5 N6 -Ni3 S2 HNPs/NF exhibits an exceptionally low cell voltage (1.48 V@10 mA cm-2 ) and outstanding durability, surpassing most of the reported Ni-based bifunctional materials. Density functional theory (DFT) further confirms the heterostructure can optimize the Gibbs free energies of H and O-containing intermediates (OH, O, OOH) during HER and OER processes, thereby accelerating the catalytic kinetics of electrochemical water splitting. The findings provide a new design strategy toward low-cost and excellent catalysts for overall water splitting.
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Affiliation(s)
- Bin Fang
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, P. R. China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China
| | - Jutao Jin
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, P. R. China
| | - Yanqin Li
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, P. R. China
| | - Haifeng Dang
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, P. R. China
| | - Mengmeng Shao
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, P. R. China
| | - Liyuan Zhao
- School of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan, Guangdong, 523808, P. R. China
| | - Nianliang Yin
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, P. R. China
| | - Wenlong Wang
- School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong, 523808, P. R. China
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