Journal
NANO RESEARCH
Volume 14, Issue 10, Pages 3489-3496Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3559-9
Keywords
interface engineering; doping; water dissociation; hydrogen adsorption; alkaline hydrogen electrocatalysis
Categories
Funding
- National Key R&D Program of China [2017YFA0700104]
- National Natural Science Foundation of China (NSFC) [21701124, 21911530255]
- Tianjin Municipal Science and Technology Commission [18TCQNJC71500, 17JCZDJC38000]
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry [2019-6]
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This study fabricated a V-doped Ni3N/Ni heterostructure catalyst through nitridation treatment, showing comparable high activity and durability to commercial Pt/C under alkaline conditions.
Alkali-water electrolyzers and hydroxide exchange membrane fuel cells are emerging as promising technologies to realize hydrogen economy. Developing cost-effective electrode materials with high activities towards corresponding hydrogen evolution (HER) and oxidation (HOR) reactions plays a crucial role in commercial hydrogen production and utilization. Herein, we fabricated a V-doped Ni3N/Ni heterostructure (V-Ni3N/Ni) through a controlled nitridation treatment on a V-incorporated nickel hydroxide precursor. The resultant catalyst exhibits comparable catalytic activity and durability to commercial Pt/C in terms of both HER (a low overpotential of 44 mV at the current density of 10 mA.cm(-2)) and HOR (a high current density of 1.54 mA.cm(-2) at 0.1 V versus reversible hydrogen electrode) under alkaline conditions. The superior activity of V-Ni3N/Ni grown on different substrates further implies its intrinsic performance. Density functional theory (DFT) calculations reveal that the coupled metallic Ni and doped V can promote the water adsorption, accelerate the Volmer step of alkaline HER, as well as optimize the adsorption and desorption of hydrogen intermediate (H*) to reach a balanced Delta GH* value.
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