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Temperature-dependent pathways in carbon dioxide electroreduction.

Shiqiang Liu1, Yaoyu Yin2, Jiahao Yang2

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This summary is machine-generated.

Lowering electrolyte temperature significantly enhances CO2 electroreduction to multicarbon products over copper catalysts. This study reveals temperature

Keywords:
Adsorption thermodynamicsCO(2) reduction reactionElectrocatalysisElectrolyte temperatureReaction kinetic

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Surface Science

Background:

  • Temperature's role in thermocatalysis is well-established.
  • Its impact on electrocatalysis, particularly CO2 electroreduction, is often overlooked.
  • Understanding temperature effects is crucial for optimizing electrochemical reactions.

Purpose of the Study:

  • To investigate the influence of electrolyte temperature on CO2 electroreduction over copper (Cu) catalysts.
  • To elucidate the underlying mechanisms governing temperature-dependent performance.
  • To correlate theoretical predictions with experimental observations.

Main Methods:

  • Density Functional Theory (DFT) calculations to study intermediate adsorption thermodynamics and reaction pathways.
  • Electrochemical experiments using various Cu catalysts.
  • Analysis of Faradaic efficiency (FE) and product selectivity (e.g., C2+ products, ethylene, methane).

Main Results:

  • Temperature significantly impacts *CO and *H intermediate adsorption thermodynamics and the water microenvironment.
  • Low temperatures favor Faradaic efficiency towards multicarbon (C2+) products.
  • A Cu nanorod electrode achieved 90.1% FE for C2+ products at -3°C and ~400 mA cm-2.
  • Ethylene and methane selectivities showed opposite trends with decreasing temperature.

Conclusions:

  • Electrolyte temperature is a critical parameter for tuning CO2 electroreduction selectivity on Cu catalysts.
  • Optimizing temperature can enhance the production of valuable multicarbon products.
  • Theoretical insights align with experimental findings, validating the proposed mechanisms.