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Using Sorbitol as Electrolyte Additive to Control Interfacial Environments in Electrochemical CO2 Reduction on

Anil Kumar Sihag1,2, Florian Altmann1, Alper T Celebi1

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ACS Catalysis
|October 9, 2025
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Summary

Adding sorbitol to electrolyte solutions enhances electrochemical reduction of carbon dioxide (CO2RR) by improving CO selectivity and reducing hydrogen evolution. Molecular dynamics simulations reveal sorbitol alters the electrode interface, benefiting CO2RR performance.

Keywords:
CO2 electroreductionFlow cellGas diffusion electrodesMolecular dynamics simulationsSilverSorbitol

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Computational Chemistry

Background:

  • Electrolyte additives are crucial for optimizing electrochemical reduction of carbon dioxide (CO2RR).
  • Understanding the molecular mechanisms of additive effects, especially in gas diffusion electrodes (GDEs), remains challenging.
  • Sorbiol's impact on CO2RR at the electrode/electrolyte interface needs further investigation.

Purpose of the Study:

  • To investigate the effect of sorbitol as an electrolyte additive on CO2RR using GDEs.
  • To elucidate the molecular mechanisms behind sorbitol's influence on CO2RR and hydrogen evolution reaction (HER).
  • To explore sorbitol's impact on the electrode/electrolyte interface composition and structure.

Main Methods:

  • Electrochemical reduction of CO2 (CO2RR) experiments using gas diffusion electrodes (GDEs) with silver nanoparticle catalysts.
  • Addition of 100 mM sorbitol to aqueous electrolyte.
  • Molecular dynamics (MD) simulations to analyze electrode/electrolyte interface composition and ion-molecule interactions.

Main Results:

  • Sorbiol addition increased CO faradaic efficiency from 79% to 90% and decreased HER from 15% to 5% at 98 mA·cm⁻².
  • MD simulations showed decreased bicarbonate concentration near the electrode interface with sorbitol.
  • Enhanced coordination between K+ ions and CO2 molecules was observed, potentially stabilizing CO intermediates.

Conclusions:

  • Sorbiol effectively enhances CO2RR performance and suppresses HER in GDEs.
  • The beneficial effects are attributed to sorbitol's influence on the electrode/electrolyte interface, reducing bicarbonate and promoting CO2 activation.
  • This study highlights the potential of nonionic additives in tuning electrocatalytic interfaces for improved CO2 conversion.