期刊
SMALL METHODS
卷 6, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202200459
关键词
bifunctional electrocatalysts; charge transfer; Co0.85Se-NiSe nanograins; superhydrophilicity; water splitting
资金
- National Natural Science Foundation of China [51872051, 52171203]
- Natural Science Foundation of Jiangsu Province [BK20211516]
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF202102]
- Fundamental Research Funds for the Central Universities [2242022R10090]
This study introduces a one-dimensional nanowire electrocatalyst composed of Co0.85Se-NiSe nanograin heterojunctions, which demonstrates efficient overall water splitting behavior in alkaline solution with high activity, durability, and low cost.
Electrochemical overall water splitting using renewable energy input is highly desirable for large-scale green hydrogen generation, but it is still challenged due to the lack of low-cost, durable, and highly efficient elec trocatalysts. Herein, 1D nanowires composed of numerous 2 nm Co0.85Se-NiSe nanograin heterojunctions as efficient precious metal-free bifunctional electrocatalyst are reported for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution with the merits of high activity, durability, and low cost. The abundant microinterface among the ultrafine nanograins and the presence of lattice distortion around nanograin interface is found to create a superhydrophilic surface of the electrocatalyst, which significantly facilitate the fast diffusion of electrolytes and the release of the formed H-2 and O-2 from the catalyst surface. Furthermore, synergic effect between Co0.85Se and NiSe grain on adjusting the electronic structure is revealed, which enhances electron mobility for fast electron transport during the HER/OER process. Owing to these merits, the rationally designed Co0.85Se-NiSe heterostructures display efficient overall water splitting behavior with a low voltage of 1.54 V at 10 mA cm(-2) and remarkable long-term durability for the investigated period of 50 h.
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