期刊
SMALL METHODS
卷 6, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202200515
关键词
honeycomb-like networks; hydrogen evolution; NiCoP nanoplates; pH-universal electrocatalysts; water-splitting
资金
- National Natural Science Foundation of China [52171203, 51872051]
- National Key Research and Development Program of China [2021YFB2400400]
- 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 proposes a strategy of Ni-Co carbonate-hydroxide induced metal-organic framework transformation to grow porous NiCoP nanoplates with high-performance, pH-universal hydrogen evolution reaction. The resulting catalyst exhibits promising electroactivity, surpassing commercial Pt/Cs. This work may provide new insights for the design of nonprecious, pH-universal electrocatalysts.
Developing a low-cost, pH-universal electrocatalyst is desirable for electrochemical water splitting but remains a challenge. NiCoP is a promising non-noble hydrogen-evolving electrocatalyst due to its high intrinsic electrical conductivity, fast mass transfer effects, and tunable electronic structure. Nevertheless, its hydrogen evolution reaction (HER) activity in full pH-range has been rarely developed. Herein, a Ni-Co carbonate-hydroxide induced metal-organic framework transformation strategy is proposed to in situ grow porous, honeycomb-like NiCoP nanoplates on Ni foam for high-performance, pH-universal hydrogen evolution reaction. The resultant NiCoP catalyst exhibits a highly 2D nanoporous network in which 20-50 nm, well-crystalline nanoparticles are interconnected with each other closely, and delivers versatile HER electroactivity with eta(10) of 98, 105, and 97 mV in 1 M KOH, 0.5 M H2SO4 , and 1 M phosphate buffer solution electrolytes, respectively. This overpotential remarkably surpasses the one of commercial Pt/Cs in both neutral and alkaline media at a large current density (>100 mA cm(-2)). The corresponding full water-splitting electrolyzer constructed from the 2D porous NiCoP cathode requires only a cell voltage of 1.43 V at 10 mA cm(-2) , superior to most recently reported electrocatalysts. This work may open up a new avenue on the rational design of nonprecious, pH-universal electrocatalyst.
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