Electrochemical CO2 Reduction on Bimetallic Surface Alloys: Enhanced Selectivity to CO for Co/Au(110) and to H2 for Sn/Au(110)

Naoto Todoroki, Hiroki Tei, Taku Miyakawa, Hiroto Tsurumaki, Toshimasa Wadayama

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We investigated electrochemical CO2 reduction (ECR) on 0.1 monolayer-thick-Co and Sn-deposited Au(110) surfaces (Co/Au(110), and Sn/Au(110)). Scanning tunneling microscopic images showed quasi-one-dimensional Co and Sn islands with different aspect ratios growing along the trenches of the missing-row direction of the (1×2) reconstructed Au(110) surface. The selectivity and partial current density of the CO and H2 evolutions correlated with those of the deposited metals. CO evolution selectivity of the former Co/Au(110) increased compared with that of the Au(110), while that of the Sn/Au(110) significantly decreased. Co/Au(110) showed 1.4-fold higher CO evolution activity than that of the clean Au(110) at −1.35 V vs. reversible hydrogen electrode. In contrast, the H2 evolution of the latter surface was significantly enhanced at a potential lower than −0.1 V. The results showed that site separations of Au and alloying elements of Co and Sn at the topmost surface determine the ECR product selectivity of alloy electrodes.

Original languageEnglish
Pages (from-to)3101-3107
Number of pages7
Issue number12
Publication statusPublished - 2019 Jun 14


  • carbon monoxide
  • electrochemical CO reduction
  • gold single crystal
  • online electrochemical mass spectrometry
  • surface alloy

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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