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arXiv · 2510.10555

Breaking the Sabatier Principle by Dynamic Adsorption-Desorption Decoupling in Electrocatalytic Hydrogen Evolution

Zi-Xuan Yang·Lei Li·Tao Huang·Hui Wan·X. S. Wang·Gui-Fang Huang·Wangyu Hu·Wei-Qing Huang
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Abstract

The Sabatier principle establishes a fundamental trade-off in heterogeneous electrocatalysis.In the hydrogen evolution reaction (HER), this trade-off is manifested by the coupling of Volmer step, which requires strong hydrogen adsorption, with the Heyrovsky/Tafel step, which favors facile desorption, thus giving rise to the classical volcano relationship and limiting activity even at $ΔG=0$. Here, we demonstrate a ferroelectric platform with dynamic tunability -- monolayer GeS$_2$ decorated with transition metal atoms as a proof-of-concept -- where polarization-driven surface electronic reconstruction enables real-time modulation of intermediate binding strength, thereby breaking the Sabatier constraint. Reversible control of hydrogen adsorption allows strong H binding to accelerate the Volmer step, followed by weakened adsorption to promote the Heyrovsky/Tafel step.This dynamic adsorption-desorption decoupling not only surpasses the volcano limit to achieve unprecedented HER activity, but also establishes a general paradigm for designing adaptive electrocatalysts capable of reconfiguring under operating conditions.

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Zi-Xuan Yang, Lei Li, Tao Huang, Hui Wan, X. S. Wang, Gui-Fang Huang, Wangyu Hu, Wei-Qing Huang. 2025-10-12. Breaking the Sabatier Principle by Dynamic Adsorption-Desorption Decoupling in Electrocatalytic Hydrogen Evolution. https://arxiv.org/abs/2510.10555

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