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Multimetal Borides Nanochains as Efficient Electrocatalysts for Overall Water Splitting
Author(s) -
Li Yingjie,
Huang Bolong,
Sun Yingjun,
Luo Mingchuan,
Yang Yong,
Qin Yingnan,
Wang Lei,
Li Chunji,
Lv Fan,
Zhang Weiyu,
Guo Shaojun
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201804212
Subject(s) - overpotential , water splitting , materials science , tafel equation , oxygen evolution , bifunctional , anode , chemical engineering , electrochemistry , electrolysis of water , cathode , electrocatalyst , electrolysis , catalysis , nanotechnology , inorganic chemistry , electrode , chemistry , photocatalysis , engineering , electrolyte , biochemistry
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 NaBH 4 reduction of Co 2+ , Ni 2+ , and Fe 2+ 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.