Superior Formic Acid Oxidation Using Carbon Nanotube-Supported Palladium Catalysts

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• 作者：Robert D. Morgan ; Amin Salehi-khojin ; Richard I. Masel
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：October 6, 2011
• 年：2011
• 卷：115
• 期：39
• 页码：19413-19418
• 全文大小：812K
• 年卷期：v.115,no.39(October 6, 2011)
• ISSN：1932-7455

文摘

In the work presented here, we report a palladium-decorated carbon nanotube catalyst that shows enhanced activity for formic acid electrooxidation. At 0.3 V vs RHE, the palladium-decorated carbon nanotube catalyst showed a current of 0.18 mA cm^鈥?, whereas a standard commercial palladium black catalyst only showed a current of 0.082 mA cm^鈥?. Also, during a 12 h chronoamperogram at 0.3 V vs RHE, the palladium-decorated carbon nanotube catalyst showed a factor of 3.5 improvement at the end of 12 h. The current was also much more stable for the palladium-decorated carbon nanotubes. During the last 8.5 h, the palladium-decorated carbon nanotubes show a current loss of 36%, whereas the standard palladium black catalyst showed a current loss of nearly 90%. Lastly, we report that the palladium-decorated carbon nanotubes showed better current stability under potential cycling. After 300 cycles in 12 M HCOOH from 0.02 to 1.45 V vs RHE, the palladium-decorated carbon nanotubes showed only a 33% current loss when measured at 0.3 V vs RHE. However, the standard palladium showed a decay of 60% when also measured at 0.3 V vs RHE.