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Large‐Scale, Bottom‐Up Synthesis of Binary Metal–Organic Framework Nanosheets for Efficient Water Oxidation
Author(s) -
Li FeiLong,
Wang Pengtang,
Huang Xiaoqing,
Young David James,
Wang HuiFang,
Braunstein Pierre,
Lang JianPing
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201902588
Subject(s) - tafel equation , overpotential , oxygen evolution , metal organic framework , chemical engineering , materials science , metal , water splitting , density functional theory , exfoliation joint , catalysis , nanotechnology , chemistry , inorganic chemistry , electrochemistry , organic chemistry , graphene , metallurgy , computational chemistry , electrode , adsorption , engineering , photocatalysis
Ultrathin metal–organic framework (MOF) nanosheets (NSs) offer potential for many applications, but the synthetic strategies are largely limited to top‐down, low‐yield exfoliation methods. Herein, Ni–M–MOF (M=Fe, Al, Co, Mn, Zn, and Cd) NSs are reported with a thickness of only several atomic layers, prepared by a large‐scale, bottom‐up solvothermal method. The solvent mixture of N , N ‐dimethylacetamide and water plays key role in controlling the formation of these two‐dimensional MOF NSs. The MOF NSs can be directly used as efficient electrocatalysts for the oxygen evolution reaction, in which the Ni–Fe–MOF NSs deliver a current density of 10 mA cm −2 at a low overpotential of 221 mV with a small Tafel slope of 56.0 mV dec −1 , and exhibit excellent stability for at least 20 h without obvious activity decay. Density functional theory calculations on the energy barriers for OER occurring at different metal sites confirm that Fe is the active site for OER at Ni–Fe–MOF NSs.