Palladium-vanadium alloy electrocatalysts for oxygen reduction: Effect of heat treatment on electrocatalytic activity and stability
Palladium-vanadium alloy electrocatalysts for oxygen reduction: Effect of heat treatment on electrocatalytic activity and stability
复制标题
DOI：
10.1016/j.apcatb.2010.04.025
复制
发表时间：
2010-07-20
影响因子：
22.1
通讯作者：
Walsh, Darren A.
中科院分区：
文献类型：
--
作者：
Ang, Shee-Yen;Walsh, Darren A.
通过金属氯化物盐的湿化学还原合成了用于氧还原反应（ORR）的炭黑（Vulcan XC72R）负载的钯-钒电催化剂。电催化剂的标称组成为60:40。 70:30 和 80:20（Pd/V 原子比）。电催化剂在 Ar 中的 10% H-2 中在一定温度下进行处理，并使用粉末 X 射线衍射和透射电子显微镜表征热处理对颗粒形态的影响。这些分析表明高温导致平均粒径增加。使用转盘电极伏安法测定电催化剂的ORR电催化活性，结果表明热处理后Pd70V30电催化剂的电催化活性显着增强。使用加速稳定性测试来检查电催化剂的电化学稳定性，该测试显示电化学循环时电化学表面积的损失，其程度取决于电催化剂的标称组成。稳定性测试后的电催化剂测试显示电催化性能损失，显微分析显示稳定性测试后电催化剂颗粒尺寸和碳载体上的分散度发生显着形态变化。 (C) 2010 Elsevier B.V. 保留所有权利。
Carbon black (Vulcan XC72R)-supported palladium-vanadium electrocatalysts for the oxygen reduction reaction (ORR) were synthesized by wet chemical reduction of metal chloride salts. The nominal compositions of the electrocatalysts were 60:40. 70:30 and 80:20 (Pd/V atomic ratio). The electrocatalysts were treated at a range of temperatures in 10% H-2 in Ar and the effect of heat treatment on particle morphology was characterised using powder X-ray diffraction and transmission electron microscopy. These analyses showed that high temperatures caused an increase in the average particle size. The electrocatalytic activities of the electrocatalysts for the ORR were determined using rotating disk electrode voltammetry, which revealed a marked enhancement in the electrocatalytic activity of the Pd70V30 electrocatalyst after heat treatment. The electrochemical stability of the electrocatalysts was examined using an accelerated stability test, which showed a loss of electrochemical surface area upon electrochemical cycling, the extent of which depended on the nominal composition of the electrocatalysts. Electrocatalyst testing after the stability test showed a loss of electrocatalytic performance and microscopic analysis revealed significant morphological changes in the electrocatalyst particle dimensions and dispersion on the carbon support after the stability test. (C) 2010 Elsevier B.V. All rights reserved.