A catalyst design for selective electrochemical reactions: direct production of hydrogen peroxide in advanced electrochemical oxidation

Young Jin Ko, Keunsu Choi, Boram Yang, Woong Hee Lee, Jun Yong Kim, Jae Woo Choi, Keun Hwa Chae, Jun Hee Lee, Yun Jeong Hwang, Byoung Koun Min, Hyung Suk Oh, Wook Seong Lee

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2 Citations (Scopus)

Abstract

Hydrogen peroxide production by enhanced electrocatalysts is an attractive alternative to the present commercial process. While the subnano/atomic dispersion in noble metal nanocatalysts is known to strongly enhance their catalytic efficiency and chemoselectivity, their excessive surface energy and consequent coarsening seriously compromise their physical/chemical stability. Here, we report a subnano/atomically dispersed Pt-Ag alloy (by a simply modified polyol process) that is resistant to agglomeration/Ostwald ripening. This catalyst does not follow a conventional four-electron oxygen reduction reaction (ORR) but selectively produces H2O2without excessive degradation of its activity. We clarified the role of the alloying element, Ag, as follows: (1) selective activation of two-electron ORR by inhibiting O2dissociation and (2) suppression of H2O2decomposition by preventing the H2O2adsorption. The present approach provides a convenient route for the direct generation of H2O2as a simple byproduct of electricity generation by fuel-cell systems.

Original languageEnglish
Pages (from-to)9859-9870
Number of pages12
JournalJournal of Materials Chemistry A
Volume8
Issue number19
DOIs
Publication statusPublished - 2020 May 21

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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    Ko, Y. J., Choi, K., Yang, B., Lee, W. H., Kim, J. Y., Choi, J. W., Chae, K. H., Lee, J. H., Hwang, Y. J., Min, B. K., Oh, H. S., & Lee, W. S. (2020). A catalyst design for selective electrochemical reactions: direct production of hydrogen peroxide in advanced electrochemical oxidation. Journal of Materials Chemistry A, 8(19), 9859-9870. https://doi.org/10.1039/d0ta01869d