Realising the activity benefits of Pt preferential (111) surfaces for ethanol oxidation in a nanowire electrocatalyst

Abstract

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Overview on the Vital Step toward Addressing Platinum Catalyst Poisoning Mechanisms in Acid Media of Direct Ethanol Fuel Cells (DEFCs)

“…In this regard, Pt nanowires were synthesized and supported on Vulcan XC-72 R carbon. 113 In that study, the catalytic activity of Pt nanowires (Pt/C NWs) toward the electrooxidation of CO and ethanol was compared with a Pt nanoparticle (Pt/C NPs). Figure 9 shows the first CO monolayer stripping voltammograms with both catalysts in a 0.5 M H 2 SO 4 electrolyte solution.…”

“…0.45, 0.73, and 0.83 V. An explanation for this discrepancy could be due to the various morphology of the Pt nanowires as compared with the Pt nanoparticle. 113,118 The first peak at 0.45 V is called the CO peroxidation peak, which might also be attributed to preferential oxidation of weakly bridgebonded CO. 68,109 The second peak at 0.73 V might be associated with the effect of Pt agglomeration on CO stripping. 125 Figure 10 shows the CVs for the EOR performed with 0.5 M ethanol in a 0.5 M H 2 SO 4 solution at room temperature.…”

“…Figure 11 displays the corresponding IR spectra for the EOR recorded at room temperature in a 0.5 M ethanol + 0.5 M H 2 SO 4 solution with Pt/C NPs and Pt/C NWs during the positively scanned potential. 113 The CO 2 formation starts on Pt/C NWs at less positive potentials than on Pt/C NPs. Furthermore, the CO band for the Pt nanowire catalyst is more intense than the Pt nanoparticle catalyst.…”

“…Energy & Fuels During the cathodic scan and the second anodic scan, there are two reversible current peaks at lower potentials that might be ascribed to the adsorption and/or desorption of hydrogen on various types of Pt sites, revealing the complete oxidation of adsorbed CO. 29,32,63,105,113,114 In addition, simultaneously recorded CVs and MSCVs for the EOR with Pt in different concentrations of ethanol (0.01, 0.1, and 1.0 M) + 0.5 M H 2 SO 4 solution are shown in Figure 3. 59 Herein, other signals can be used to distinguish between products such as CO 2 + and CH 3 CHO + , which both have m/z = 44, to avoid interference.…”

Synthesis of Alloyed Pd−Pb Nanowire Networks for Electrocatalytic Ethanol Oxidation with High Stability

“…Consequently, it is urgent to find an efficient catalyst to lower the activation energy of the reaction to make the fuel cell better applied [13–16] . Although Pt was confirmed as an excellent electrocatalyst, it is not suitable for large‐scale use owing to its low storage [17–20] . Great efforts have transferred to seek for other alternative catalysts, like Pd, the same family as Pt, which has attracted great interests in recent years [21–26] …”