Copper Aluminum Layered Double Hydroxides with Different Compositions and Morphologies as Electrocatalysts for the Carbon Dioxide Reduction Reaction

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Abstract

Electrochemical CO2 reduction (CO2RR) is a key technology to convert greenhouse gas CO2 to value-added products, such as CO and formic acid (HCOOH). In the present study, two-dimensional Cu- and Al-based layered double hydroxides (Cu−Al/LDHs) were applied as CO2RR catalysts. The catalysts were synthesized using a simple co-precipitation method employing sodium carbonate solutions with different pH and synthesis temperatures. The elemental ratio of Cu and Al, and sheet size were controlled. The most active Cu−Al/LDH showed a faradaic efficiency for CO generation of 42 % and one for formate generation of 22 % at the current density of 50 mA using a gas diffusion electrode system under galvanostatic conditions. Our result indicates that the sheet size of the LDH sheet is a critical parameter for determining CO2RR activity.

Original languageEnglish
JournalChemSusChem
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • copper
  • electrocatalysis
  • heterogeneous catalysis
  • layered double hydroxides
  • non-noble-metals

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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