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Manipulating Interfacial Charge Distribution for Water Reduction.

Jing Wu1,2, Xin Wang1,2, Wenhao Zheng1,2

  • 1Academy for Advanced Interdisciplinary Science and Technology, Beijing Key Laboratory for Advanced Energy Materials and Technologies, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, P. R. China.

Journal of the American Chemical Society
|October 15, 2025
PubMed
Summary
This summary is machine-generated.

Researchers engineered lattice strain in NiCo2S4 to optimize interfacial charge distribution for enhanced hydrogen evolution reaction (HER) catalysis. This method synergistically boosts non-Faradaic and Faradaic processes, offering a new route for electrocatalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Heterogeneous electrocatalysis involves complex non-Faradaic and Faradaic processes at the electrode/electrolyte interface.
  • Reaction kinetics typically depend exponentially on applied bias, complicating independent tuning of these processes.
  • Synergistically regulating multiple reaction steps via a unified mediator is a significant challenge.

Purpose of the Study:

  • To precisely manipulate interfacial charge distribution to overcome challenges in heterogeneous electrocatalysis.
  • To investigate the effect of lattice strain engineering on NiCo2S4 for the alkaline hydrogen evolution reaction (HER).
  • To establish a synergistic optimization route for kinetic multisteps in electrocatalytic reactions.

Main Methods:

  • Lattice strain engineering of NiCo2S4.
  • Investigating interfacial charge distribution.
  • Analyzing the alkaline hydrogen evolution reaction (HER).
  • Correlating e_g orbital filling with Faraday charge.

Main Results:

  • Achieved optimal matching between non-Faradaic and Faradaic charges in NiCo2S4 via lattice strain.
  • Alleviated electrostatic potential restrictions on water molecule reorganization.
  • Strengthened chemical potential's contribution to water molecule dissociation.
  • Identified moderate e_g orbital filling as key to increased Faraday charge, exhibiting a volcanic relationship.

Conclusions:

  • Interfacial charge redistribution via lattice strain engineering provides a synergistic optimization route for electrocatalytic kinetic multisteps.
  • This approach is effective for the hydrogen evolution reaction (HER) and potentially applicable to other heterogeneous electrocatalytic reactions.