Journal
NANO-MICRO LETTERS
Volume 13, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-021-00639-x
Keywords
Interfacial and doping engineering; Heterostructured electrocatalyst; Solar-driven; Hydrogen evolution; Urea-assisted water splitting
Funding
- National Natural Science Foundations of China [21878061]
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Non-noble metal-based catalysts with heterostructure and multi-metal synergistic effects show promise for efficient water electrolysis to produce hydrogen, with improved activity and electron transfer efficiency.
To achieve high efficiency of water electrolysis to produce hydrogen (H-2), developing non-noble metal-based catalysts with considerable performance have been considered as a crucial strategy, which is correlated with both the interphase properties and multi-metal synergistic effects. Herein, as a proof of concept, a delicate NiCo(OH)(x)-Co-y W catalyst with a bush-like heterostructure was realized via gas-template-assisted electrodeposition, followed by an electrochemical etching-growth process, which ensured a high active area and fast gas release kinetics for a superior hydrogen evolution reaction, with an overpotential of 21 and 139 mV at 10 and 500 mA cm(-2), respectively. Physical and electrochemical analyses demonstrated that the synergistic effect of the NiCo(OH)(x)/Co-y W heterogeneous interface resulted in favorable electron redistribution and faster electron transfer efficiency. The amorphous NiCo(OH)(x) strengthened the water dissociation step, and metal phase of CoW provided sufficient sites for moderate H immediate adsorption/H-2 desorption. In addition, NiCo(OH)(x)-CoyW exhibited desirable urea oxidation reaction activity for matching H-2 generation with a low voltage of 1.51 V at 50 mA cm(-2). More importantly, the synthesis and testing of the NiCo(OH)(x)-CoyW catalyst in this study were all solar-powered, suggesting a promising environmentally friendly process for practical applications.
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