Journal
SMALL
Volume 15, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201804212
Keywords
Co-based multimetal borides; nanochains; overall water splitting; regulable electronic structure
Categories
Funding
- National Basic Research Program of China [2017YFA0206701]
- National Natural Science Foundation of China (NSFC) [51671003]
- China Postdoctoral Science Foundation [2017M620526, 2017M610022]
- Open Project Foundation of State Key Laboratory of Chemical Resource Engineering
- Young Thousand Talented Program
- Peking University
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The development of cost-efficient, active, and stable electrode materials as bifunctional catalysts for electrochemical water splitting is crucial to high-performance renewable energy storage and conversion devices. In this work, the synthesis of Co-based multi-metal borides nanochains with amorphous structure is reported for boosting the oxygen evolution (OER) and hydrogen evolution reactions (HER) by one-pot NaBH4 reduction of Co2+, Ni2+, and Fe2+ under ambient temperature. In all the investigated Co-based metal borides, NiCoFeB nanochains show the excellent OER performance with a low overpotential of 284 mV at 10 mA cm(-2) and Tafel slope of 46 mV dec(-1), respectively, together with excellent catalytic stability, and robust HER performance with an overpotential of 345 mV at 10 mA cm(-2). The density functional theory (DFT) calculations reveal that the excellent electrocatalytic performance is mainly attributed to optimal electronic structure by tuning the Co-3d band activities by the incorporation of Ni and Fe for enhanced water splitting via the potentially existed Co-0 state. Moreover, the electrolyzer using NiCoFeB nanochains as anode and cathode offers 10 mA cm(-2) at a cell voltage of 1.81 V, comparable to commercial Pt/C // Ir/C, providing a simple method to design and explore highly efficient and cheap bifunctional electrocatalysts for overall water splitting.
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