期刊
JOURNAL OF POWER SOURCES
卷 389, 期 -, 页码 249-259出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.04.027
关键词
Bimetal embedded nitrogen-doped carbon framework; Metal-organic framework derivatives; Bifunctional electrocatalysts; Overall water splitting
资金
- National Natural Science Foundation of China [21575021]
Rational synthesis and development of earth-abundant materials with efficient electrocatalytic activity and stability for water splitting is a critical but challenging step for sustainable energy application. Herein, a family of bimetal (CoFe, CoCu, CoNi) embedded nitrogen-doped carbon frameworks is developed through a facile and simple thermal conversion strategy of metal-doped zeolitic imidazolate frameworks. Thanks to collaborative superiorities of abundant M-N-C species, modulation action of secondary metal, cobalt-based electroactive phases, template effect of MOFs and unique porous structure, bimetal embedded nitrogen-doped carbon frameworks materials manifest good oxygen and hydrogen evolution catalytic activity. Especially, after modulating the species and molar ratio of metal sources, optimal Co(0.7)sFe(0.25) nitrogen-doped carbon framework catalyst just requires a low overpotential of 303 mV to achieve 10 mA cm(-2) with a low Tafel slope (39.49 mV dec(-1)) for oxygen evolution reaction, which even surpasses that of commercial RuO2. In addition, the optimal catalyst can function as an efficient bifunctional electrocatalyst for overall water splitting with satisfying activity and stability. This development offers an attractive direction for the rational design and fabrication of porous carbon materials for electrochemical energy applications.
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