Tungsten carbide nanocrystal promoted Pt/C electrocatalysts for oxygen reduction
Tungsten carbide nanocrystal promoted Pt/C electrocatalysts for oxygen reduction
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DOI：
10.1021/jp054523a
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发表时间：
2005-12-08
影响因子：
3.3
通讯作者：
Shen, PK
中科院分区：
文献类型：
--
作者：
Meng, H;Shen, PK
采用间歇微波加热（IMH）法制备了碳化钨纳米晶（W2C/C）和碳化钨纳米晶与铂碳（Pt-W2C/C）复合电催化剂，并首次测试了酸性介质中氧的电还原。结果表明，碳化钨纳米晶促进的 Pt/C 电催化剂对 ORR 非常活跃，在环境温度下起始电位为 1.0 V vs SHE，比传统 Pt/C 电催化剂高出 100 mV 以上。测定了动力学参数。 Pt-W2C/C 上的 ORR 在高和低过电势区域的交换电流密度比 Pt/C 上的高两个数量级，显示出提高 ORR 活性的协同效应。新型电催化剂表现出对甲醇的抗中毒特性。
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.