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Alkali‐Etched Ni(II)‐Based Metal–Organic Framework Nanosheet Arrays for Electrocatalytic Overall Water Splitting
Author(s) -
Zhou Jian,
Dou Yibo,
Wu XueQian,
Zhou Awu,
Shu Lun,
Li JianRong
Publication year - 2020
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.201906564
Subject(s) - nanosheet , materials science , water splitting , electrolyte , alkali metal , conductivity , metal organic framework , chemical engineering , catalysis , inorganic chemistry , platinum , nanotechnology , electrode , chemistry , photocatalysis , organic chemistry , adsorption , engineering
The exploration of efficient electrocatalysts is the central issue for boosting the overall efficiency of water splitting. Herein, pertinently creating active sites and improving conductivity for metal–organic frameworks (MOFs) is proposed to tailor electrocatalytic properties for overall water splitting. An Ni(II)‐MOF nanosheet array is presented as an ideal material model and a facile alkali‐etched strategy is developed to break its NiO bonds accompanied with the introduction of extra‐framework K cations, which contribute to creating highly active open metal sites and largely improving the electrical conductivity. As a result, the assembled defect‐Ni‐MOF||defect‐Ni‐MOF electrolyte cell delivers a lower and stable voltage of 1.50 V at 10 mA cm −2 in alkaline medium for overall water splitting, comparable to the combination of iridium and platinum as benchmark catalysts.