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Nano Research

Article Title

In situ decomposition of metal-organic frameworks into ultrathin nanosheets for the oxygen evolution reaction

Keywords

oxygen evolution reaction, metal-organic frameworks(MOFs), in situ decomposition, ultrathin nanosheets, electrocatalyst

Abstract

The oxygen evolution reaction (OER) is a pivotal process for water-splitting andmany other energy technologies involving oxygen electrodes. Herein, a newsynthesis strategy is proposed to prepare OER catalysts based on a simple yetflexible in situ decomposition of Co-based acetate hydroxide metal-organicframeworks (MOFs). This process allows straightforward fabrication of various 2Dhydroxide ultrathin nanosheets (UNSs) with excellent component controllability.The as-obtained Co-based hydroxide UNSs demonstrate superior catalytic activityfor the OER due to the exposure of numerous active sites. In particular, the CoNihydroxide UNSs exhibit low overpotentials (η) of 324 and 372 mV at currentdensities of 10 and 100 mA·cm–2, respectively; a large turnover frequency (TOF)of 0.16 s–1 at η = 380 mV; and a small Tafel slope of 33 mV·dec–1 in an alkalineenvironment. Importantly, these values are superior to those of the state-of-theartIrO2 commercial electrocatalyst. This facile strategy enables the exploration ofmore efficient and economic OER electrocatalysts with various constituents andopens a promising avenue for large-scale fabrication of functional nanocatalystsfor use in clean energy technologies

Graphical Abstract

Publisher

Tsinghua University Press

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