Direct and continuous generation of pure acetic acid solutions via electrocatalytic carbon monoxide reduction

Peng Zhu, Chuan Xia, Chun Yen Liu, Kun Jiang, Guanhui Gao, Xiao Zhang, Yang Xia, Yongjiu Lei, Husam N. Alshareef, Thomas P. Senftle, Haotian Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)

Abstract

Electrochemical CO2 or CO reduction to high-value C2+ liquid fuels is desirable, but its practical application is challenged by impurities from cogenerated liquid products and solutes in liquid electrolytes, which necessitates cost- and energy-intensive downstream separation processes. By coupling rational designs in a Cu catalyst and porous solid electrolyte (PSE) reactor, here we demonstrate a direct and continuous generation of pure acetic acid solutions via electrochemical CO reduction. With optimized edge-to-surface ratio, the Cu nanocube catalyst presents an unprecedented acetate performance in neutral pH with other liquid products greatly suppressed, delivering a maximal acetate Faradaic efficiency of 43%, partial current of 200 mA·cm−2, ultrahigh relative purity of up to 98 wt%, and excellent stability of over 150 h continuous operation. Density functional theory simulations reveal the role of stepped sites along the cube edge in promoting the acetate pathway. Additionally, a PSE layer, other than a conventional liquid electrolyte, was designed to separate cathode and anode for efficient ion conductions, while not introducing any impurity ions into generated liquid fuels. Pure acetic acid solutions, with concentrations up to 2 wt% (0.33 M), can be continuously produced by employing the acetate-selective Cu catalyst in our PSE reactor.

Original languageEnglish
Article numbere2010868118
JournalProceedings of the National Academy of Sciences of the United States of America
Volume118
Issue number2
DOIs
Publication statusPublished - 12 Jan 2021
Externally publishedYes

Keywords

  • CO reduction
  • Pure acetic acid
  • Solid electrolyte

ASJC Scopus subject areas

  • General

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