Electro-Oxidation of CO Saturated in 0.1 M HClO4 on Basal and Stepped Pt Single-Crystal Electrodes at Room Temperature Accompanied by Surface Reconstruction
Electro-Oxidation of CO Saturated in 0.1 M HClO4 on Basal and Stepped Pt Single-Crystal Electrodes at Room Temperature Accompanied by Surface Reconstruction
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DOI：
10.3390/surfaces2020023
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发表时间：
2019-06-01
期刊：
影响因子：
2
通讯作者：
Inukai, Junji
中科院分区：
文献类型：
--
作者：
Abe, Kiyotaka;Uchida, Hiroyuki;Inukai, Junji
CO在Pt表面的电氧化不仅在电化学中具有重要意义，而且在家用燃料电池中也具有重要的实用价值，可以避免CO对Pt催化剂的毒害。和（431）单晶表面，使用三室电池来理解对在0.1M HClO4中饱和的CO的电氧化的活性和耐久性。在相对于可逆氢电极的0.07和0.95 V之间的电位循环期间，在低于0.5 V的电位下用于CO的电氧化的电流消失，伴随着表面重构。其中Pt（100）电极的起始电位最低，为0.29V，但在一个电位循环后活性突然消失，活性中心极不稳定。为了研究失活过程，还对Pt（111）在CO饱和溶液中进行了电位阶跃测量。重复周期的形成Pt氧化物在高电位和Pt羰基物种在低电位的表面上提出的失活过程。
The electro-oxidation of CO on Pt surface is not only fundamentally important in electrochemistry, but also practically important in residential fuel cells for avoiding the poisoning of Pt catalysts by CO. We carried out cyclic voltammetry on Pt(111), (110), (100), (10 10 9), (10 9 8), (10 2 1), (432), and (431) single-crystal surfaces using a three compartment cell to understand the activity and durability towards the electro-oxidation of CO saturated in 0.1 M HClO4. During the potential cycles between 0.07 and 0.95 V vs. the reversible hydrogen electrode, the current for the electro-oxidation of CO at potentials lower than 0.5 V disappeared, accompanied by surface reconstruction. Among the electrodes, the Pt(100) electrode showed the lowest onset potential of 0.29 V, but the activity abruptly disappeared after one potential cycle; the active sites were extremely unstable. In order to investigate the processes of the deactivation, potential-step measurements were also conducted on Pt(111) in a CO-saturated solution. Repeated cycles of the formations of Pt oxides at a high potential and Pt carbonyl species at a low potential on the surface were proposed as the deactivation process.