Modification of CO 2 reduction activity of nanostructured silver electrocatalysts by surface halide anions

Yu Chi Hsieh, Luis E. Betancourt, Sanjaya D. Senanayake, Enyuan Hu, Yu Zhang, Wenqian Xu, Dmitry Polyansky

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper describes the effect of halide anions (X = Cl, Br, I) immobilized on the surface of nanostructured silver electrocatalysts on the efficiency and the mechanism of CO 2 reduction to CO in aqueous carbonate solutions. A simple oxidation-reduction cycle on Ag foil in the presence of halide anions produces high-surface-area nanostructured catalysts mainly composed of metallic Ag with a small amount of halide anions attached to the electrode surface (X-Ag) as demonstrated by XPS, XRD, and SEM studies. The activity of X-Ag electrocatalysts in 0.1 M NaHCO 3 at pH 6.8 is significantly higher than that of Ag foil or Ag nanoparticles with comparable surface area and morphology. The activity enhancement is attributed to the formation of active catalytic sites, presumably Cl - -Ag n + clusters on the surface of metallic Ag, as evidenced by XPS analysis. The activity of X-Ag catalysts is in the order Cl > Br > I, which is consistent with the proposed model of an active site. The Tafel analysis of electrochemical CO 2 reduction points to the sensitivity of the mechanism of electrocatalysis on the nature of X.

Original languageEnglish
Pages (from-to)102-109
Number of pages8
JournalACS Applied Energy Materials
Volume2
Issue number1
DOIs
Publication statusPublished - Jan 28 2019

Fingerprint

Electrocatalysts
Carbon Monoxide
Silver
Anions
Negative ions
Metal foil
X ray photoelectron spectroscopy
Electrocatalysis
Catalysts
Carbonates
Nanoparticles
Scanning electron microscopy
Electrodes

Keywords

  • CO reduction
  • Electrocatalysis
  • Halide modifier
  • Silver catalyst
  • Silver cathode

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Chemical Engineering (miscellaneous)
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Modification of CO 2 reduction activity of nanostructured silver electrocatalysts by surface halide anions . / Hsieh, Yu Chi; Betancourt, Luis E.; Senanayake, Sanjaya D.; Hu, Enyuan; Zhang, Yu; Xu, Wenqian; Polyansky, Dmitry.

In: ACS Applied Energy Materials, Vol. 2, No. 1, 28.01.2019, p. 102-109.

Research output: Contribution to journalArticle

Hsieh, Yu Chi ; Betancourt, Luis E. ; Senanayake, Sanjaya D. ; Hu, Enyuan ; Zhang, Yu ; Xu, Wenqian ; Polyansky, Dmitry. / Modification of CO 2 reduction activity of nanostructured silver electrocatalysts by surface halide anions In: ACS Applied Energy Materials. 2019 ; Vol. 2, No. 1. pp. 102-109.
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