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

Preparation of C@WC Supporter with a Core-shell Structure and Pd /C@WC Catalyst for Formic Acid Electrooxidation

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。

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 of 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 mE/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.