Electrocatalytic Oxidation of Glycerol to Formic Acid by CuCo2O4Spinel Oxide Nanostructure Catalysts

Xiaotong Han, Hongyuan Sheng, Chang Yu, Theodore W. Walker, George W. Huber, Jieshan Qiu, Song Jin

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

Abstract

The electrochemical oxidation of abundantly available glycerol for the production of value-added chemicals, such as formic acid, could be a promising approach to utilize glycerol more effectively and to meet the future demand for formic acid as a fuel for direct or indirect formic acid fuel cells. Here we report a comparative study of a series of earth-abundant cobalt-based spinel oxide (MCo2O4, M = Mn, Fe, Co, Ni, Cu, and Zn) nanostructures as robust electrocatalysts for the glycerol oxidation to selectively produce formic acid. Their intrinsic catalytic activities in alkaline solution follow the sequence of CuCo2O4 > NiCo2O4 > CoCo2O4 > FeCo2O4 > ZnCo2O4 > MnCo2O4. Using the best-performing CuCo2O4 catalyst directly integrated onto carbon fiber paper electrodes for the bulk electrolysis reaction of glycerol oxidation (pH = 13) at the constant potential of 1.30 V vs reversible hydrogen electrode (RHE), a high selectivity of 80.6% for formic acid production and an overall Faradaic efficiency of 89.1% toward all value-added products were achieved with a high glycerol conversion of 79.7%. Various structural characterization techniques confirm the stability of the CuCo2O4 catalyst after electrochemical testing. These results open up opportunities for studying earth-abundant electrocatalysts for efficient and selective oxidation of glycerol to produce formic acid or other value-added chemicals.

Original languageEnglish (US)
Pages (from-to)6741-6752
Number of pages12
JournalACS Catalysis
Volume10
Issue number12
DOIs
StatePublished - Jun 19 2020
Externally publishedYes

Keywords

  • biomass conversion
  • electrocatalysis
  • formic acid
  • fuel cell
  • glycerol oxidation
  • spinel oxides

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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