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Issue 3, 2020
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Photo-induced charge kinetic acceleration in ultrathin layered double hydroxide nanosheets boosts the oxygen evolution reaction

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Abstract

The oxygen evolution reaction (OER) is vital for a series of renewable energy solutions including water splitting and metal–air batteries. Great effort focused on nanostructure engineering has enabled a substantial advance in cost-efficient OER catalysts. In contrast, this work reports a simple and feasible strategy to improve OER performance via integrating photo-electro activation. Herein, for the first time, we present an interesting photo-enhanced effect on electrocatalytic OER activity for layered double hydroxides (LDHs). Defect-rich ultrathin CoFe-LDH nanosheets (NSs) are demonstrated as a typical semiconducting catalyst to exhibit a nearly 3-fold increase in mass activity upon 1 sun irradiation (100 mW cm−2), higher than those of the most advanced OER catalysts. Photo-induced charge kinetic analyses reveal dynamic optimization in terms of photon harvesting, charge separation and transfer, and surface catalysis. This work describes the compatibility of photo-electro activation over semiconducting LDHs, opening a new avenue to improve catalytic activity with free solar energy.

Graphical abstract: Photo-induced charge kinetic acceleration in ultrathin layered double hydroxide nanosheets boosts the oxygen evolution reaction

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Article information


Submitted
11 Nov 2019
Accepted
11 Dec 2019
First published
11 Dec 2019

J. Mater. Chem. A, 2020,8, 1105-1112
Article type
Communication

Photo-induced charge kinetic acceleration in ultrathin layered double hydroxide nanosheets boosts the oxygen evolution reaction

P. Ding, F. Luo, P. Wang, W. Xia, X. Xu, J. Hu and H. Zeng, J. Mater. Chem. A, 2020, 8, 1105
DOI: 10.1039/C9TA12377F

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