Journal
CHEMCATCHEM
Volume 12, Issue 24, Pages 6401-6409Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202001239
Keywords
hierarchical structures; Layered double hydroxides; hydrogen evolution reaction; Nickel Sulfide
Categories
Funding
- National Natural Science Foundation of China [51872139]
- Natural Science Basic Research Program of Shaanxi [2019JLM-28]
- Six Talent Peak Project of Jiangsu Province [XCL-043]
- NSF of Jiangsu Province [BK20170045]
- Fundamental Research Funds for the Central Universities [31020200QD041]
- Recruitment Program of Global Experts [1211019]
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Designing an electrocatalyst with optimized structure and performance is vital for the electrolysis of water to produce hydrogen. Herein, a three-dimensional (3D) hierarchical composite electrode material is proposed for alkaline hydrogen evolution reaction (HER), consisting of Co-Al hydroxides (CoAl-LDHs) nanosheets decorated with vertically aligned nickel sulfide (Ni3S2) arrays (Ni3S2@CoAl-LDHs/NF). The as-obtained electrocatalyst displays a minimum overpotential of 175 mV at 10 mA cm(-2) toward HER. Electrochemical impedance spectroscopy and Tafel slope further reveals outstanding kinetics in the electrolysis process. The catalytic performance of the electrode can still maintain 90 % capacity after 1000 CV cycles. The outstanding properties of the composite material benefits from its unique 3D hierarchical structure, which promote plentiful active sites and faster electronic transfer rate. This work sheds lights on the current research of noble-metal-free electrocatalysts and the design of overall water splitting.
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