Proton sponge promotion of electrochemical CO2 reduction to multi-carbon products

Lei Fan, Chun Yen Liu, Peng Zhu, Chuan Xia, Xiao Zhang, Zhen Yu Wu, Yingying Lu, Thomas P. Senftle, Haotian Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

High alkaline electrolytes have shown the potential to promote high-value C2+ products in the electrochemical CO2 reduction reaction (CO2RR), but the practical application is challenged by their strong CO2 absorption with the electrolyte to form carbonate. By modifying the Cu catalyst surface with water-insoluble organosuperbases, such as thebis(dimethylamino)naphthalene “proton sponge,” here, we change the interfacial microenvironment to stabilize adsorbed CO through a locally enhanced electrostatic field while maintaining a neutral pH electrolyte. Molecular dynamics (MD) with a reactive force field and density functional theory (DFT) calculations show that the CO intermediate is stabilized on the Cu surface by protonated organosuperbases, which promotes C2+ product formation over CO desorption. The organosuperbase-modified commercial Cu nanoparticle presented a 20-fold improvement in C2+ to C1 ratio compared with its pristine performance, delivering a maximal C2+ faradic efficiency of ∼80% and large partial current of over 270 mA cm−2 in neutral electrolyte.

Original languageEnglish
Pages (from-to)205-220
Number of pages16
JournalJoule
Volume6
Issue number1
DOIs
Publication statusPublished - 19 Jan 2022
Externally publishedYes

Keywords

  • carbonate formation issues
  • electrochemical CO reduction
  • multi-carbon products
  • organosuperbases
  • proton sponge

ASJC Scopus subject areas

  • Energy(all)

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