标题：In situ decomposition of metal-organic frameworks into ultrathin nanosheets for the oxygen evolution reaction
作者：He, Kai; Cao, Zhen; Liu, Ruirui; Miao, Ya; Ma, Houyi; Ding, Yi
作者机构：[He Kai] School of Chemistry and Chemical Engineering, Shandong University, Key Laboratory of Colloid and Interface Chemistry of State Education Minis 更多
通讯作者地址：[Ding, Y]Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Adv Funct Porous Mat, Tianjin 300384, Peoples R China.
关键词：oxygen evolution reaction; metal-organic frameworks (MOFs); in situ; decomposition; ultrathin nanosheets; electrocatalyst
摘要：The oxygen evolution reaction (OER) is a pivotal process for water-splitting and many other energy technologies involving oxygen electrodes. Herein, a new synthesis strategy is proposed to prepare OER catalysts based on a simple yet flexible in situ decomposition of Co-based acetate hydroxide metal-organic frameworks (MOFs). This process allows straightforward fabrication of various 2D hydroxide ultrathin nanosheets (UNSs) with excellent component controllability. The as-obtained Co-based hydroxide UNSs demonstrate superior catalytic activity for the OER due to the exposure of numerous active sites. In particular, the CoNi hydroxide UNSs exhibit low overpotentials (eta) of 324 and 372 mV at current densities of 10 and 100 mA center dot cm(-2), respectively; a large turnover frequency (TOF) of 0.16 s(-1) at eta = 380 mV; and a small Tafel slope of 33 mV center dot dec(-1) in an alkaline environment. Importantly, these values are superior to those of the state-of-theart IrO2 commercial electrocatalyst. This facile strategy enables the exploration of more efficient and economic OER electrocatalysts with various constituents and opens a promising avenue for large-scale fabrication of functional nanocatalysts for use in clean energy technologies.