Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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The Ways for Bi on Pt to Enhance Formic Acid Oxidation

  • Hyein Lee (Department of Chemistry, Chungnam National University) ;
  • Young Jun Kim (Department of Chemistry, Chungnam National University) ;
  • Youngku Sohn (Department of Chemistry, Chungnam National University) ;
  • Choong Kyun Rhee (Department of Chemistry, Chungnam National University)
  • Received : 2022.06.30
  • Accepted : 2022.08.13
  • Published : 2023.02.28
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Abstract

This work presents a correlation between the behavior of formic acid oxidation (FAO) on various Bi-modified Pt(poly) disk electrodes and their morphologies observed on Bi-modified Pt(111) disk electrodes using electrochemical scanning tunneling microscopy (EC-STM) to understand the effects of Bi on Pt. To distinguish the FAO activities of Bi on Pt and plain Pt around Bi, additional Pt was intentionally deposited using two different routes: direct route and iodine route. In direct route, Pt was directly deposited on Bi islands and plain Pt sites around Bi islands, while in iodine route, Pt was exclusively deposited on Bi islands by protecting plain Pt sites with adsorbed iodine. Thus, a comparison of FAO performances on the two Bi-modified Pt electrodes with additional Pt (deposited in the different ways) disclosed a difference in FAO performances on plain Pt sites and Bi islands. When Bi coverage was ~0.04, the Bi deposits were scattered Bi islands enhancing FAO on Pt(poly). The additional Pt deposits using direct route increased FAO efficiency, while the ones using iodine route slightly decreased FAO current. The EC-STM observations indicated that Pt deposits around Bi islands, not on Bi islands, were responsible for the FAO current increase on Bi-modified Pt(poly). The FAO efficiency on Bi-modified Pt(poly) with a Bi coverage of ~0.25 increased by a factor of 2. However, the additional Pt deposits using the two Pt deposition routes notably decreased the FAO current. The dependency of FAO on Bi coverage was discussed in terms of electronic effect and ensemble effect.

Keywords

Acknowledgement

This work was supported by Chungnam National University (2021-0865-01).

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