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Metal‐Organic Frameworks Derived Nanotube of Nickel–Cobalt Bimetal Phosphides as Highly Efficient Electrocatalysts for Overall Water Splitting
Author(s) -
Yan Liting,
Cao Lei,
Dai Pengcheng,
Gu Xin,
Liu Dandan,
Li Liangjun,
Wang Ying,
Zhao Xuebo
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201703455
Subject(s) - phosphide , materials science , bimetal , water splitting , bimetallic strip , oxygen evolution , catalysis , nickel , cobalt , bifunctional , chemical engineering , electrolyte , anode , inorganic chemistry , electrolysis , electrolysis of water , electrocatalyst , metal , electrochemistry , chemistry , metallurgy , electrode , photocatalysis , organic chemistry , engineering
The design of highly efficient, stable, and noble‐metal‐free bifunctional electrocatalysts for overall water splitting is critical but challenging. Herein, a facile and controllable synthesis strategy for nickel–cobalt bimetal phosphide nanotubes as highly efficient electrocatalysts for overall water splitting via low‐temperature phosphorization from a bimetallic metal‐organic framework (MOF‐74) precursor is reported. By optimizing the molar ratio of Co/Ni atoms in MOF‐74, a series of Co x Ni y P catalysts are synthesized, and the obtained Co4Ni1P has a rare form of nanotubes that possess similar morphology to the MOF precursor and exhibit perfect dispersal of the active sites. The nanotubes show remarkable hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalytic performance in an alkaline electrolyte, affording a current density of 10 mA cm −2 at overpotentials of 129 mV for HER and 245 mV for OER, respectively. An electrolyzer with Co4Ni1P nanotubes as both the cathode and anode catalyst in alkaline solutions achieves a current density of 10 mA cm −2 at a voltage of 1.59 V, which is comparable to the integrated Pt/C and RuO 2 counterparts and ranks among the best of the metal‐phosphide electrocatalysts reported to date.