Ai Tianyu, Bao Shuo, Lu Jinlin
School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, China.
Front Chem. 2021 Apr 30;9:667754. doi: 10.3389/fchem.2021.667754. eCollection 2021.
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.
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。
