Pt Deposits on Bi-Modified Pt Electrodes of Nanoparticle and Disk: A Contrasting Behavior of Formic Acid Oxidation

Lee, Hyein; Kim, Young Jun; Sohn, Youngku; Rhee, Choong Kyun

doi:10.33961/jecst.2021.00178

Cited by 6 publications

(2 citation statements)

References 40 publications

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“…5), indicating that the current is certainly ascribable to an FAO path occurring on oxidized surfaces of I/Bi/Pt(poly) and Pt/I/Bi/Pt(poly). This particular FAO process occurring at a high potential of ~0.8 V should be distinguished from the well-known FAO routes taking place on metallic surfaces of Pt and Bimodified Pt below 0.4 V. Therefore, the FAO process of interest has been proposed to be oxidized surface path by us [31,36]. On such oxidized electrode surfaces, some surface oxygen anions formed in the presence of Bi may promote FAO via bifunctional mechanism: for instance, surface oxygen anions (e.g., O δ-, δ ≤ 2) may assist to de-hydrogenate HCOOH in some way (or HCOOH + 2O δ-→ CO 2 + 2OH (δ-1)-+ 2e).…”

Section: Resultsmentioning

confidence: 96%

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The Ways for Bi on Pt to Enhance Formic Acid Oxidation

Lee

Kim

Sohn

et al. 2023

J. Electrochem. Sci. Technol

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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.

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Section: Resultsmentioning

confidence: 96%

“…In direct route (Fig. 1(b)), additional Pt would deposit on two different places: Bi islands and plain Pt sites around Bi islands [31,36]. The FAO behavior on this particular Pt-modified Bi/Pt disk (designated Pt/Bi/Pt disk) is anticipated to simultaneously come from the Pt deposits on Bi islands and the Pt deposits on plain Pt sites.…”

Section: Introductionmentioning

confidence: 99%

The Ways for Bi on Pt to Enhance Formic Acid Oxidation

Lee

Kim

Sohn

et al. 2023

J. Electrochem. Sci. Technol

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Selective Synthesis of Formyl‐2‐Furancarboxylic Acid via Enhanced Adsorption of 5‐Hydroxymethylfurfural on Composite Catalysts

Wang,

Lu,

et al. 2024

ChemCatChem

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5‐Hydroxymethylfurfural (HMF) is a widely used biomass platform chemical that plays a crucial role in bridging biomass and fossil resources. Electrocatalytic oxidation of HMF provides an efficient way to obtain high‐value‐added biomass‐derived chemicals, among which the intermediate product 5‐formyl‐2‐furan carboxylic acid (FFCA) has attracted considerable attention. However, the weak adsorption ability of monometallic nickel oxide (NiOx) to HMF in neutral electrolyte restricts its further development, resulting in low HMF conversion and FFCA yield. In this study, we successfully constructed a novel nickel oxide‐platinum oxide hybrid catalyst supported on carbon felt (NiOx‐PtOx/CF), which exhibits an optimized adsorption ability of HMF, leading to the outstanding FFCA yield up to 77% in the neutral media. The high activity of the NiOx‐PtOx/CF catalyst can be attributed to the redistribution of the electrons and the optimization of the electronic structure on the Ni active site due to the introduction of PtOx on NiOx nanosheets. This study offers valuable insights for the design of efficient multicomponent electrocatalysts for electrocatalytic biomass refinery systems.

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