Palladium-Copper Electrocatalyst for Promotion of Oxidation of Formate and Ethanol in Alkaline Media
Palladium-Copper Electrocatalyst for Promotion of Oxidation of Formate and Ethanol in Alkaline Media
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DOI：
10.1016/j.electacta.2014.04.188
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发表时间：
2014-08
影响因子：
6.6
通讯作者：
Jennifer Noborikawa;J. Lau;Jennine Ta;Shouzhen Hu;L. Scudiero;S. Derakhshan;S. Ha;J. Haan
中科院分区：
文献类型：
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作者：
Jennifer Noborikawa;J. Lau;Jennine Ta;Shouzhen Hu;L. Scudiero;S. Derakhshan;S. Ha;J. Haan
采用金属盐还原法制备了Pd-Cu/C和Pd/C催化剂。这两种催化剂的物理，化学和电化学表征进行了比较，并用于了解在碱性介质中甲酸盐和乙醇的电化学氧化过程中铜对钯表面的影响。循环伏安法和计时电流法显示，在碱性介质中，Pd-Cu/C合金催化剂对甲酸盐和乙醇的氧化速率和稳定性均高于Pd/C催化剂。与Pd/C催化剂相比，在Pd-Cu/C催化剂的情况下，Pd 3d的芯能级和Pd的d带中心的结合能上移，表明这两种金属之间的电荷转移。这些结果表明，Cu的添加诱导了Pd表面上的电子效应，显著地促进了甲酸盐和乙醇在碱性介质中的氧化速率的增加
Pd-Cu/C and Pd/C catalysts were synthesized via a metal salt reduction method. Physical, chemical, and electrochemical characterizations of these two catalysts were compared and used to understand the impact of copper on the palladium surface during the electrochemical oxidation of formate and ethanol in alkaline media. Cyclic voltammetry and chronoamperometry display an enhanced oxidation rate and stability for Pd-Cu/C alloy catalyst toward formate and ethanol in alkaline media when compared to Pd/C catalyst. The binding energy of the core level of Pd 3d and the d-band center of Pd were upshifted in the case of Pd-Cu/C catalyst compared to the Pd/C catalyst indicating a charge transfer between these two metals. These results demonstrate that the addition of Cu induces an electronic effect on the Pd surface significantly contributing to the increase in oxidation rates for both formate and ethanol in alkaline media