淡江大學機構典藏:Item 987654321/124068
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    題名: Concave Pt-Zn nanocubes with high-index faceted Pt skin as highly efficient oxygen reduction catalyst
    作者: M. Liu;B. A. Lu;G. Yang;P. Yuan;H. Xia;Y. Wang;K. Guo;S. Zhao;J. Liu;Y. Yu;W. Yan;C. L. Dong*;J. N. Zhang*
    關鍵詞: Pt-Zn catalyst;high-index facets;oxygen reduction reaction;ultrathin Pt skin
    日期: 2022-02-24
    上傳時間: 2023-05-12 12:08:21 (UTC+8)
    出版者: Wiley-VCH GmbH
    摘要: High dosage of expensive Pt to catalyze the sluggish oxygen reduction reaction (ORR) on the cathode severely impedes the commercialization of proton exchange membrane fuel cells. Therefore, it is urgent to cut down the Pt catalyst by efficiently improving the ORR activity while maintaining high durability. Herein, magic concave Pt–Zn nanocubes with high-index faceted Pt skin (Pt78Zn22) are proposed for high-efficiency catalysis toward proton exchange membrane fuel cells. These unique structural features endow the Pt-skin Pt78Zn22/KB with a mass activity of 1.18 mA μgPt–1 and a specific activity of 3.64 mA cm–2 for the ORR at 0.9 V (vs RHE). Meanwhile, the H2–O2 fuel cell assembled by this catalyst delivers an ultrahigh peak power density of ≈1449 mW cm–2. Both experiments and theoretical calculations show that the electronic structure of the surface is adjusted, thereby shortening the length of the Pt–Pt bond and reducing the adsorption energy of OH*/O* on the Pt surface. This work demonstrates the synergistic effect of the oxidation-resistant metal Zn and the construction of Pt-rich surface engineering. Also, it guides the future development of catalysts for their practical applications in energy conversion technologies and beyond.
    關聯: Advanced Science 9(12), 2200147
    DOI: 10.1002/advs.202200147
    顯示於類別:[電機工程學系暨研究所] 期刊論文

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