Performance Improvement by Tungsten Oxides of the Pt-RuOxHy Electrocatalyst for Methanol Oxidation

The dissolution of hydrous ruthenium oxide (RuOxHy) from a Pt-RuOxHy anode catalyst supported on multi-walled carbon nanotubes (MWCNTs) during pretreatment over an extended potential range (−0.20–0.96 V vs SCE) can be dramatically reduced from 70% to 15% by the addition of WOm. The Pt-RuOxHy-WOm catalyst did not lose activity according to chronoamperometric measurement of methanol oxidation after an extended potential range pretreatment compared with that pretreated in a narrow potential range (−0.20–0.46 V vs SCE) where no ruthenium dissolution occurred. In contrast, the activity loss of the reference Pt-RuOxHy catalyst was as high as 50%.

摘要：在多壁碳纳米管负载的 Pt-RuOxHy 样品中引入氧化钨 (WOm), 能有效抑制样品中水合氧化钌 (RuOxHy) 在酸性电解质溶液中的溶解. 在扩展电势 (–0.20∼0.96 V vs SCE) 的电化学预处理过程中, RuOxHy 的溶解程度从 Pt-RuOxHy 中的 70% 降至 Pt-RuOxHy-WOm 中的 15%. 计时电流曲线测试结果表明, 与窄电势区间 (–0.20∼0.46 V vs SCE) 预处理的钌物种没有流失的样品相比, 经扩展电势区间预处理的 Pt-RuOxHy-WOm 样品上甲醇电氧化反应的活性没有下降, 而 Pt-RuOxHy 样品的活性则下降 50%.

The dissolution of hydrous ruthenium oxide (RuOxHy) from a Pt-RuOxHy anode catalyst can be dramatically reduced by the incorporation of WOm. The resultant Pt-RuOxHy-WOm catalyst exhibited high stability for methanol electro-oxidation.Figure optionsDownload as PowerPoint slide