当前位置: X-MOL 学术Electrochim. Acta › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Platinum nanoparticles with TiO2–skin as a durable catalyst for photoelectrochemical methanol oxidation and electrochemical oxygen reduction reactions
Electrochimica Acta ( IF 5.5 ) Pub Date : 2020-03-29 , DOI: 10.1016/j.electacta.2020.136119
Shuai Kang , Fan Xia , Zhuofeng Hu , Wei Hu , Yin She , Liang Wang , Xie Fu , Wenqiang Lu

Performance degradation of Pt nanoparticles is considered to be among the most severe problems for electrochemical reactions. Pt–TiO2 catalysts are widely studied due to the optical effect of TiO2, which is beneficial for electron transfer during methanol oxidation. However, different configurations of these catalysts are insufficient in research. Here, we report rationally designed Pt nanoparticles with TiO2-skin as electrocatalysts for methanol oxidations and oxygen reduction reactions. Methanol oxidation current densities of the Pt–TiO2 nanoparticles are largely improved under irradiation. When the catalysts are tortured successive at ultrahigh current up to 1.0 mA cm−2, the potential-increase is as small as 90 mV. It shows good stability with a peak current fades of 4% after 250 cycles under illumination, compared with 13% in the dark. It also exhibits a much better oxygen reduction durability compared with Pt/C. By mechanism analysis, we believe the excellence in photoelectrochemistry is attributed to the TiO2-skin. The electrons generated in TiO2 spontaneously migrate to Pt nanoparticles, which provide a partially reducing atmosphere to prevent Pt nanoparticles from ionization and dissolution.



中文翻译:

带有TiO 2-皮肤的铂纳米颗粒可作为光电化学甲醇氧化和电化学氧还原反应的耐用催化剂

Pt纳米颗粒的性能下降被认为是电化学反应最严重的问题之一。由于TiO 2的光学效应,对Pt–TiO 2催化剂进行了广泛的研究,这有利于甲醇氧化过程中的电子转移。然而,这些催化剂的不同构型在研究中是不足的。在这里,我们报告了合理设计的,带有TiO 2皮肤的Pt纳米颗粒作为甲醇甲醇氧化和氧还原反应的电催化剂。Pt–TiO 2纳米粒子的甲醇氧化电流密度在辐照下得到了很大的改善。当催化剂在高达1.0 mA cm -2的超高电流下连续折磨时,电位增加低至90 mV。它显示出良好的稳定性,在光照下250个循环后峰值电流衰减为4%,而在黑暗中则为13%。与Pt / C相比,它还具有更好的氧还原耐久性。通过机理分析,我们认为光电化学的卓越性归因于TiO 2-皮肤。TiO 2中产生的电子自发迁移至Pt纳米粒子,从而提供了部分还原的气氛,以防止Pt纳米粒子电离和溶解。

更新日期:2020-03-30
down
wechat
bug