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Co-deposits of Pt and Bi on Au disk toward formic acid oxidation
Journal of Solid State Electrochemistry ( IF 2.6 ) Pub Date : 2020-08-11 , DOI: 10.1007/s10008-020-04794-w
Hyein Lee , Young Jun Kim , Youngku Sohn , Choong Kyun Rhee

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.



中文翻译:

Au盘上Pt和Bi的共沉积对甲酸氧化

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。

更新日期:2020-08-11
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