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.

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。