Improved kinetics of methanol oxidation on Pt/hollow carbon sphere catalysts
Improved kinetics of methanol oxidation on Pt/hollow carbon sphere catalysts
复制标题
改进 Pt/空心碳球催化剂上甲醇氧化的动力学
DOI：
10.1016/j.electacta.2008.06.051
复制
发表时间：
2008-11-30
影响因子：
6.6
通讯作者：
Shen, Pei Kang
中科院分区：
文献类型：
--
作者：
Wu, Jin;Hu, Fengping;Shen, Pei Kang
采用水热法和间歇微波加热技术相结合的方法制备了空心碳球。研究了影响hcs性能的制备因素。结果表明，在微波加热3 min后，HCS （Pt/HCS）上负载的Pt纳米粒子对甲醇的氧化性能最好。Pt/HCS催化剂具有较高的电化学活性表面积，在相同的Pt负载下，与商用Pt/C催化剂相比，其甲醇氧化活性更高。在Pt/HCS催化剂上观察到更高的交换电流密度和更低的反应激活自由能，表明反应动力学得到改善。人们认为，Pt/HCS具有开放的小孢子和纳米通道的空心结构是甲醇氧化具有较高催化活性的原因。(c) 2008 Elsevier Ltd.版权所有。
Hollow carbon spheres (HCSs) have been prepared by combining the hydrothermal method and intermittent microwave heating (IMH) technique. The preparation factors affecting the performance of the HCSs are studied. The results show that Pt nanoparticles supported on HCSs (Pt/HCS), which were heated for 3 min in a microwave oven, give the best performance for methanol oxidation.The higher electrochemical active surface area of the Pt/HCS catalysts results in higher catalytic activity for methanol oxidation compared to that of the commercial Pt/C catalyst at the same Pt loadings. Higher exchange current density and lower reaction activation free energy are observed on Pt/HCS catalysts, indicating improved kinetics. It is recognized that the hollow structure of the Pt/HCS with open microspores and nanochannels is responsible for this higher catalytic activity for methanol oxidation. (c) 2008 Elsevier Ltd. All rights reserved.