This study investigates the performance of Ag/C and a range of AgPt/C nanoparticles as electrocatalysts for glycerol electrooxidation reaction (GEOR). Low amounts of Pt (<2 %) were spontaneously deposited on Ag-supported nanoparticles using Ag as a sacrificial metal. The primary aim of the study is to determine the impact of adding a small amount of Pt to the Ag/C catalyst. Cyclic voltammetry is employed to assess the electrocatalyst's performance, while in situ Fourier Transform Infrared (FTIR) spectroscopy is used to examine the formed reaction intermediates and products. Additionally, physical characterization techniques such as XRD and XPS are applied to analyze the material structure. The AgPt/C series of catalysts show a significant improvement in the glycerol oxidation process with the addition of 0.25 % of Pt to the material composition compared to pure Ag. It is observed that the enhancement performance reaches a limit at a Pt composition of approximately 7 % in the metallic nanoparticles, indicating that further increases in Pt content do not yield additional improvements. The in situ FTIR studies reveal that the presence of Pt on the Ag surface leads to a distinct glycerol electrooxidation mechanism compared to using Ag alone. Small amounts of Pt deposits promote C−C−C bond breaking, as evidenced by the selective formation of formic acid and CO. FTIR results demonstrate a preference for carboxylic acid formation, with no significant evidence of dihydroxyacetone (DHA) production. The findings emphasize the critical role of Pt composition in the electrooxidation of glycerol paving the way for the design and development of more efficient and sustainable electrooxidation catalysts.

中文翻译：

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揭示 Pt 添加对 Ag/C 催化剂增强甘油电氧化的影响

本研究研究了 Ag/C 和一系列 AgPt/C 纳米粒子作为甘油电氧化反应 (GEOR) 电催化剂的性能。使用 Ag 作为牺牲金属，少量 Pt (<2%) 自发沉积在 Ag 支撑的纳米颗粒上。该研究的主要目的是确定向 Ag/C 催化剂添加少量 Pt 的影响。循环伏安法用于评估电催化剂的性能，而原位傅里叶变换红外（FTIR）光谱用于检查形成的反应中间体和产物。此外，还应用 XRD 和 XPS 等物理表征技术来分析材料结构。与纯银相比，AgPt/C 系列催化剂在材料成分中添加了 0.25% 的 Pt，显示出甘油氧化过程的显着改善。据观察，增强性能在金属纳米颗粒中 Pt 成分约为 7% 时达到极限，表明 Pt 含量的进一步增加不会产生额外的改进。原位 FTIR 研究表明，与单独使用 Ag 相比，Ag 表面上 Pt 的存在导致了独特的甘油电氧化机制。少量的 Pt 沉积物促进 C−C−C 键断裂，选择性形成甲酸和 CO 就证明了这一点。FTIR 结果表明优先形成羧酸，但没有明显证据表明二羟基丙酮 (DHA) 的产生。研究结果强调了 Pt 成分在甘油电氧化中的关键作用，为设计和开发更高效和可持续的电氧化催化剂铺平了道路。