期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 11, 页码 5984-5993出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202014362
关键词
heterointerfaces; hydrazine electro-oxidation; hydrogen evolution; nickel; overall hydrazine splitting
资金
- National Natural Science Foundation of China [52072359, 21890750]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB36030300]
- Recruitment Program of Global Experts
- Fundamental Research Funds for the Central Universities [WK2060000016]
- National Key R&D Program of China [2017YFA0207301]
This study reports hierarchical porous nanosheet arrays with abundant Ni3N-Co3N heterointerfaces on Ni foam, showing superior activity in hydrogen evolution reaction (HER) and hydrazine oxidation reaction (HzOR). Research indicates that optimizing heterointerfaces can improve hydrogen adsorption free energy and promote hydrazine dehydrogenation kinetics.
Electrochemical water splitting for H-2 production is limited by the sluggish anode oxygen evolution reaction (OER), thus using hydrazine oxidation reaction (HzOR) to replace OER has received great attention. Here we report the hierarchical porous nanosheet arrays with abundant Ni3N-Co3N heterointerfaces on Ni foam with superior hydrogen evolution reaction (HER) and HzOR activity, realizing working potentials of -43 and -88 mV for 10 mA cm(-2), respectively, and achieving an industry-level 1000 mA cm(-2) at 200 mV for HzOR. The two-electrode overall hydrazine splitting (OHzS) electrolyzer requires the cell voltages of 0.071 and 0.76 V for 10 and 400 mA cm(-2), respectively. The H-2 production powered by a direct hydrazine fuel cell (DHzFC) and a commercial solar cell are investigated to inspire future practical applications. DFT calculations decipher that heterointerfaces simultaneously optimize the hydrogen adsorption free energy (Delta G(H*)) and promote the hydrazine dehydrogenation kinetics. This work provides a rationale for advanced bifunctional electrocatalysts, and propels the practical energy-saving H-2 generation techniques.
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