Meng Hui, Shen Pei Kang
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China.
J Phys Chem B. 2005 Dec 8;109(48):22705-9. doi: 10.1021/jp054523a.
Tungsten carbide nanocrystals on carbon (W2C/C) and tungsten carbide nanocrystals and Pt on carbon (Pt-W2C/C) composite electrocatalysts were prepared by the intermittent microwave heating (IMH) method and tested for the electroreduction of oxygen in the acidic media for the first time. The results revealed that the tungsten carbide nanocrystal promoted Pt/C electrocatalyst was very active for ORR with the onset potential of 1.0 V vs SHE at ambient temperature that is over 100 mV more positive compared with that of traditional Pt/C electrocatalyst. The kinetic parameters were determined. The exchange current densities at both high and low overpotential regions are two orders higher for ORR on Pt-W2C/C than that on Pt/C, showing a synergetic effect to improve the activity for ORR. The novel electrocatalysts show a poisoning resistant property toward methanol.
采用间歇微波加热（IMH）法制备了碳载碳化钨纳米晶体（W2C/C）以及碳载碳化钨纳米晶体与铂复合催化剂（Pt-W2C/C），并首次在酸性介质中对其氧电还原性能进行了测试。结果表明，碳化钨纳米晶体促进的Pt/C电催化剂对氧还原反应（ORR）具有很高的活性，在室温下相对于标准氢电极（SHE）的起始电位为1.0 V，比传统Pt/C电催化剂正100 mV以上。测定了动力学参数。在高过电位和低过电位区域，Pt-W2C/C上ORR的交换电流密度比Pt/C上的高两个数量级，显示出协同效应，提高了ORR活性。新型电催化剂对甲醇具有抗中毒性能。
