Solar-Driven Interfacial Evaporation Accelerated Electrocatalytic Water Splitting on 2D Perovskite Oxide/MXene Heterostructure
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Date
2023
Authors
Lu, Y.
Zhang, H.
Wang, Y.
Zhu, X.
Xiao, W.
Xu, H.
Li, G.
Li, Y.
Fan, D.
Zeng, H.
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Journal article
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Advanced Functional Materials, 2023; 33(21)
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<jats:title>Abstract</jats:title><jats:p>The rational design of economic and high‐performance electrocatalytic water‐splitting systems is of great significance for energy and environmental sustainability. Developing a sustainable energy conversion‐assisted electrocatalytic process provides a promising novel approach to effectively boost its performance. Herein, a self‐sustained water‐splitting system originated from the heterostructure of perovskite oxide with 2D Ti<jats:sub>3</jats:sub>C<jats:sub>2</jats:sub>T<jats:sub>x</jats:sub> MXene on Ni foam (La<jats:sub>1‐x</jats:sub>Sr<jats:sub>x</jats:sub>CoO<jats:sub>3</jats:sub>/Ti<jats:sub>3</jats:sub>C<jats:sub>2</jats:sub>T<jats:sub>x</jats:sub> MXene/Ni) that shows high activity for solar‐powered water evaporation and simultaneous electrocatalytic water splitting is presented. The all‐in‐one interfacial electrocatalyst exhibits highly improved oxygen evolution reaction (OER) performance with a low overpotential of 279 mV at 10 mA cm<jats:sup>−2</jats:sup> and a small Tafel slope of 74.3 mV dec<jats:sup>−1</jats:sup>, superior to previously reported perovskite oxide‐based electrocatalysts. Density functional theory calculations reveal that the integration of La<jats:sub>0.9</jats:sub>Sr<jats:sub>0.1</jats:sub>CoO<jats:sub>3</jats:sub> with Ti<jats:sub>3</jats:sub>C<jats:sub>2</jats:sub>T<jats:sub>x</jats:sub> MXene can lower the energy barrier for the electron transfer and decrease the OER overpotential, while COMSOL simulations unveil that interfacial solar evaporation could induce OH<jats:sup>−</jats:sup> enrichment near the catalyst surfaces and enhance the convection flow above the catalysts to remove the generated gas, remarkably accelerating the kinetics of electrocatalytic water splitting.</jats:p>
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Copyright 2023 Wiley-VCH GmbH
Access Condition Notes: Accepted manuscript available after 1 April 2024