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通过反相微乳液合成的用于燃料电池甲醇电氧化的核壳结构PtMo@TiO纳米颗粒

Core-Shell Structured PtMo@TiO Nanoparticles Synthesized by Reverse Microemulsion for Methanol Electrooxidation of Fuel Cells.

作者信息

Ai Tianyu, Bao Shuo, Lu Jinlin

机构信息

School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, China.

出版信息

Front Chem. 2021 Apr 30;9:667754. doi: 10.3389/fchem.2021.667754. eCollection 2021.

Abstract

The high price of catalyst and poor durability still restrict the development of fuel cells. In this work, core-shell structured PtMo@TiO nanoparticles with low Pt content are prepared by a reverse microemulsion method. The morphologies, particle size, structure, and composition of PtMo@TiO nanoparticles are examined by several techniques such as X-ray Diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy, etc. The PtMo@TiO electrocatalysts show significantly higher catalytic activity and better durability for methanol oxidation than the commercial Pt/C (ETEK). Compared to Pt/C catalyst, the enhancement of the electrochemical performance of PtMo@TiO electrocatalysts can be attributed to the core-shell structure and the shift of the d-band center of Pt atoms, which can weaken the adsorption strength toward CO molecules, facilitate the removal of the CO groups and improve electrocatalytic activity. The development of PtMo@TiO electrocatalysts is promising to reduce the use of noble metal Pt and has a great potential for application in fuel cells.

摘要

催化剂的高成本和较差的耐久性仍然制约着燃料电池的发展。在这项工作中,通过反相微乳液法制备了具有低铂含量的核壳结构PtMo@TiO纳米颗粒。采用X射线衍射、X射线光电子能谱和透射电子显微镜等多种技术对PtMo@TiO纳米颗粒的形貌、粒径、结构和组成进行了研究。PtMo@TiO电催化剂对甲醇氧化表现出明显更高的催化活性和更好的耐久性,优于商业Pt/C(ETEK)。与Pt/C催化剂相比,PtMo@TiO电催化剂电化学性能的提高可归因于核壳结构和Pt原子d带中心的移动,这可以削弱对CO分子的吸附强度,促进CO基团的去除并提高电催化活性。PtMo@TiO电催化剂的开发有望减少贵金属Pt的使用,在燃料电池中具有巨大的应用潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/07c4/8120002/a7e38ef8ac5c/fchem-09-667754-g0001.jpg

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