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- Title
Self-supported NiFe-LDH nanosheets on NiMo-based nanorods as high-performance bifunctional electrocatalysts for overall water splitting at industrial-level current densities.
- Authors
Zhang, Yan; Feng, Biao; Yan, MingLei; Shen, Zhen; Chen, Yiqun; Tian, Jingyi; Xu, Fengfei; Chen, Guanghai; Wang, Xizhang; Yang, Lijun; Wu, Qiang; Hu, Zheng
- Abstract
Efficient, durable and economic electrocatalysts are crucial for commercializing water electrolysis technology. Herein, we report an advanced bifunctional electrocatalyst for alkaline water splitting by growing NiFe-layered double hydroxide (NiFe-LDH) nanosheet arrays on the conductive NiMo-based nanorods deposited on Ni foam to form a three-dimensional (3D) architecture, which exhibits exceptional performances for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In overall water splitting, only the low operation voltages of 1.45/1.61 V are required to reach the current density of 10/500 mA·cm−2, and the continuous water splitting at an industrial-level current density of 500 mA·cm−2 shows a negligible degradation (1.8%) of the cell voltage over 1000 h. The outstanding performance is ascribed to the synergism of the HER-active NiMo-based nanorods and the OER-active NiFe-LDH nanosheet arrays of the hybridized 3D architecture. Specifically, the dense NiFe-LDH nanosheet arrays enhance the local pH on cathode by retarding OH− diffusion and enlarge the electrochemically active surface area on anode, while the conductive NiMo-based nanorods on Ni foam much decrease the charge-transfer resistances of both electrodes. This study provides an efficient strategy to explore advanced bifunctional electrocatalysts for overall water splitting by rationally hybridizing HER- and OER-active components.
- Subjects
OXYGEN evolution reactions; ELECTROCATALYSTS; NANORODS; FOAM; NANOSTRUCTURED materials; HYDROGEN evolution reactions; WATER electrolysis
- Publication
Nano Research, 2024, Vol 17, Issue 5, p3769
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-023-6303-9