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Alkali metal cations critically influence electrocatalysis, affecting reaction rates and efficiency. Understanding these cation effects on interfacial properties is key to optimizing reactions like hydrogen evolution and CO2 reduction.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Surface Chemistry

Background:

  • Alkali metal cations in electrolytes significantly impact electrocatalytic reaction kinetics and efficiency.
  • Understanding cation effects at the molecular level is crucial for optimizing electrocatalytic processes.

Purpose of the Study:

  • To review recent advances in understanding cation effects on electrocatalytic reactions.
  • To summarize the influence of alkali metal cations on hydrogen evolution (HER), oxygen evolution (OER), and CO2 electroreduction (CO2 RR).

Main Methods:

  • Literature review of molecular-level understanding of cation effects.
  • Analysis of cation influence on interfacial electric fields, water structure, active site blocking, intermediate stabilization, and interfacial pH.
  • Discussion of experimental and theoretical findings.

Main Results:

  • Cation-induced interfacial phenomena, including electric fields and water structuring, affect electrocatalytic performance (activity, selectivity, stability).
  • General agreement exists on the relationship between alkali cation size and reaction activity for HER, OER, and CO2 RR.
  • Mechanisms of cation influence on electrocatalytic performance are still under debate.

Conclusions:

  • Alkali metal cations are pivotal in tailoring electrocatalysis, influencing interfacial properties and reaction outcomes.
  • While cation size-activity trends are recognized, the precise mechanisms require further investigation.
  • Targeting cation-electrolyte interactions offers a pathway for designing advanced electrocatalytic systems.