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Effect of Intrinsic Ferroelectric Phase Transition on Hydrogen Evolution Electrocatalysis

journal contribution
posted on 2024-11-17, 13:51 authored by Fengmei Wang, Lin Ju, Binglan Wu, Shuhui Li, Jian Peng, Yetao Chen, Marshet Getaye Sendeku, Kairui Wang, Yuchen Cai, Jun Yi, Ying Yang, Zhenxing Wang, Xiaoming Sun
Heterogeneous electrocatalysis closely relies on the electronic structure of the catalytic materials. The ferroelectric-to-paraelectric phase transition of the materials also involves a change in the state of electrons that could impact the electrocatalytic activity, but such correlation remains unexplored. Here, we demonstrate experimentally and theoretically that the intrinsic electrocatalytic activity could be regulated as exampled by hydrogen evolution reaction catalysis over two-dimensional ferroelectric CuInP2S6. The obvious discontinuity in the overpotential and apparent activation energy values for CuInP2S6 electrode are illustrated during the ferroelectric-to-paraelectric phase transition caused by copper displacement around Tc point (318 K), revealing the ferroelectro-catalytic effect on thermodynamics and kinetics of electrocatalysis. When loading Pt single atom on the CuInP2S6, the paraelectric phase one showed an improved hydrogen evolution activity with smaller apparent activation energy over the ferroelectric phase counterpart. This is attributed to the copper hopping between two sulfur planes, which alternate between strong and weak H adsorption at the Pt sites to simultaneously promote H+ reactant adsorption and H2 product desorption.

Funding

Natural Science Foundation of Henan Province (232300420128)

History

Journal title

Angewandte Chemie - International Edition

Language

English

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