Presented in this work is an investigation of co-deposits of Pt and Bi on Au disk (Pt-Bi/Au) toward formic acid oxidation (FAO) using voltammetry and X-ray photoelectron spectroscopy (XPS). The co-deposits of Pt and Bi on Au were prepared using an irreversible method in a mixed solution of Pt ion (1 mM) and Bi ion (5 mM), and the amount of co-deposits was controllable by the number of deposition cycles. The voltammetric studies revealed that the Pt-Bi/Au surfaces presented the characteristics of Pt, Bi, and Au depending on the number of deposition cycles. A detailed analysis of semi-quantitative results of XPS combined with hydrogen coverage on Pt and covered fraction of Au surface suggested two aspects of Pt-Bi co-deposits. One is that during co-adsorption, Bi adsorbing with a low efficiency enhanced irreversible adsorption of Pt. The other is that the Pt-Bi co-deposits would be an alloy of Pt-Bi when the Pt amount was low or Pt deposits enriched with Bi in surface regions when the Pt amount was high. The best FAO catalytic efficiency among the investigated Pt-Bi/Au surfaces was ~ 14 mA/cm², which was higher than that of plain Pt deposits on Au (~ 6 mA/cm²) and comparable to that of sequentially prepared Bi-modified Pt deposits on Au (Bi/Pt/Au, ~ 20 mA/cm²). Because of a similarity in compositions and catalytic performances of the best Pt-Bi/Au and Bi/Pt/Au, the preparation procedure was concluded not to be critical so that the co-deposition method was more beneficial in terms of the number of deposition cycles in manufacturing electrocatalysts toward FAO.

这项工作介绍了使用伏安法和X射线光电子能谱（XPS）研究Au盘上Pt和Bi的共沉积物（Pt-Bi / Au）对甲酸氧化（FAO）的研究。Pt和Bi在Au上的共沉积是通过不可逆的方法在Pt离子（1 mM）和Bi离子（5 mM）的混合溶液中制备的，并且可通过沉积循环数来控制共沉积量。伏安研究表明，Pt-Bi / Au表面具有Pt，Bi和Au的特征，这取决于沉积循环的次数。对XPS的半定量结果的详细分析，结合氢在Pt上的覆盖率和Au表面的覆盖率，提出了Pt-Bi共沉积的两个方面。一种是在共吸附过程中，低效率的Bi吸附会增强Pt的不可逆吸附。另一个是当Pt量低时，Pt-Bi共沉积物将是Pt-Bi的合金，或者当Pt量高时，Pt-Bi共沉积物将是在表面区域富集Bi的Pt-Bi合金。在研究的Pt-Bi / Au表面中，最佳的FAO催化效率为〜14 mA / cm²，这比在Au纯铂沉积物的更高（约6毫安/厘米²），并比得上在Au（BI /铂/金，约20毫安/厘米顺序制备的Bi改性的Pt沉积的²）。由于最好的Pt-Bi / Au和Bi / Pt / Au的组成和催化性能相似，因此得出结论，制备过程并不关键，因此，共沉积方法在沉积数量方面更为有利粮农组织生产电催化剂的周期。