北京化工大学Fengmei Wang团队经过努力，研究了本征铁电相变对析氢电催化的影响。2024年2月26日出版的《德国应用化学》杂志发表了这项成果。

研究人员从实验和理论上，以二维铁电CuInP₂S₆上的析氢反应催化为例，证明了其固有的电催化活性可以被调节。CuInP₂S₆电极的过电位和表观活化能存在明显的不连续性，这体现在Tc点(318k)附近铜置换形成的铁电-准电相变过程中，揭示了铁电催化效应对电催化热力学和动力学的影响。

当在CuInP₂S₆上加载Pt单原子时，准电相比铁电相表现出更高的析氢活性和更小的表观活化能。这是由于铜在两个硫平面之间跳跃，在Pt位点上交替进行强、弱H吸附，同时促进H⁺反应物吸附和H₂产物脱附。

据悉，多相体电催化与催化材料的电子结构密切相关。材料的铁电到准电相变也涉及到可能影响电催化活性的电子状态的变化，但这种相关性仍未被探索。

附：英文原文

Title: Effect of Intrinsic Ferroelectric Phase Transition on Hydrogen Evolution Electrocatalysis

Author: 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

Issue&Volume: 2024-02-26

Abstract: 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.

DOI: 10.1002/anie.202402033

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202402033