Anchoring ultrafine Pt electrocatalysts on TiO2-C via photochemical strategy to enhance the stability and efficiency for oxygen reduction reaction
Anchoring ultrafine Pt electrocatalysts on TiO2-C via photochemical strategy to enhance the stability and efficiency for oxygen reduction reaction
复制标题
通过光化学策略将超细Pt电催化剂锚定在TiO2-C上以提高氧还原反应的稳定性和效率
DOI：
10.1016/j.apcatb.2018.05.085
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发表时间：
2018-12
期刊：
影响因子：
--
通讯作者：
Wang Deli
中科院分区：
文献类型：
--
作者：
Wang Jingyu;Xu Min;Zhao Jianquan;Fang Huaifang;Huang Qingzhu;Xiao Weiping;Li Tao;Wang Deli
Pt电催化剂的活性和稳定性是涉及氧还原反应（ORR）的能量转换系统的关键问题。在本工作中，超细Pt纳米颗粒被TiO 2表面的光生电子原位还原，使得它们中的大多数选择性地锚定在TiO 2纳米晶体周围。TiO 2在碳表面的分散增强了金属与载体的相互作用，提高了催化剂的ORR活性，半波电位比市售的20 wt% Pt/C正移了约49 mV。更重要的是，Pt/TiO 2-C催化剂在10，000次循环后表现出更耐用的性能，其电化学表面积下降（0.8%）和质量活性下降（0.9%）远低于Pt/C（10.2%和33.3%）。高温耐久性测试还揭示了ORR活性的高得多的保留。结果表明，锚定Pt上分散良好的二氧化钛修饰的碳将是一个有效的策略，以提高ORR性能的强金属-载体相互作用，这有利于电子转移在催化反应过程中，以及防止Pt聚集在耐久性测试。
The activity and stability of Pt electrocatalysts are crucial issues for energy conversion systems involving oxygen reduction reaction (ORR). In this work, the ultrafine Pt nanoparticles were in situ reduced by the photogenerated electrons on TiO2surface so that most of them selectively anchored around the TiO2nanocrystals. The presence of well-dispersed TiO2on carbon surface strengthened the metal-support interaction, giving rise to the improved ORR catalytic activity with ∼49 mV positive shift of half-wave potential as compared to commercial 20 wt% Pt/C. More importantly, the Pt/TiO2-C catalysts exhibited a more durable performance after 10,000 cycles in terms of the decrease in electrochemical surface area (0.8%) and mass activity (0.9%), much lower than those of Pt/C (10.2% and 33.3%). The high-temperature durability test also revealed a much higher retention of ORR activity. The results demonstrated that anchoring Pt on well-dispersed TiO2-decorated carbon would be an effective strategy to enhance the ORR performance by strong metal-support interaction, which facilitated the electron transfer during catalytic reactions as well as prevented Pt aggregation during durability test.
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