核壳结构C@WC载体的制备及Pd/C@WC催化剂对甲酸的电催化氧化

doi:10.3724/SP.J.1095.2014.30631

摘要/Abstract

摘要： 以活性碳为碳源，在碳表面原位生成碳化钨包覆的核壳结构的碳基材料(C@WC)。 TEM结果表明，制备的C@WC是具有核壳结构的碳材料，且WC中也有少量单质W。 BET比表面测量结果表明，C@WC较活性碳比表面小，但具有更多的介孔结构。以C@WC为载体制备的Pd/C@WC催化剂电极的电化学比表积较大，为65.47 m2/g。 Pd/C@WC对甲酸的电催化氧化活性较高，氧化峰电流密度为0.222 A/cm2，比Pd/C电极上的氧化峰电流密度增加了0.128 A/cm2。多周期循环伏安曲线的结果也表明，Pd/C@WC催化剂电极比Pd/C具有更高的活性和稳定性。

关键词: 钯, 碳化钨, 甲酸氧化, 载体

Abstract: The support of C@WC core-shell structure is prepared with activated carbon as carbon source, in situ generation tungsten carbide coating on the surface of carbon material. TEM results confirm that the prepared C@WC is coreshell structure. The composition of the shell is mainly WC containing a small amount of W. BET specific surface measurement results show that the specific surface area of C@WC is smaller than that of XC-72R, but with more of the mesoporous structure. The electrochemical surface area of Pd/C@WC is 65.47 m2/g. The Pd/C@WC catalyst electrode is more active for formic acid oxidation than Pd/C. The peak current density on Pd/C@WC is 0.222 A/cm2 which is about 0.128 A/cm2 higher than that on Pd/C. The multiple cyclic voltammograms results show that Pd/C@WC catalyst electrode has higher activity and stability compared with Pd/C for formic acid electrooxidation.

Key words: palladium, tungsten carbide, formic acid oxidation, support

中图分类号:

O646

齐增新, 邓超, 邬冰, 高颖. 核壳结构C@WC载体的制备及Pd/C@WC催化剂对甲酸的电催化氧化[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30631.

QI Zengxin, DENG Chao, WU Bing, GAO Ying*. Preparation of C@WC Supporter with a Core-shell Structure and Pd/C@WC Catalyst for Formic Acid Electrooxidation[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30631.

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