Статья

Encapsulating Pt Nanoparticles inside a Derived Two-Dimensional Metal–Organic Frameworks for the Enhancement of Catalytic Activity

Wei WuCollege of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, ChinaZeyi ZhangCollege of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, ChinaZhao LeiCollege of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, ChinaXiaoyue WangCollege of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, ChinaYangyang TanCollege of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, ChinaNiancai ChengCollege of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, ChinaXueliang SunDepartment of Mechanical and Materials Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada

2020en

ABI

Аннотация

The development of highly active and stable electrocatalysts toward oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is a key for commercial application of fuel cells and water splitting. Here, we report a highly active and stable Pt nanoparticles (NPs) encapsulated in ultrathin two-dimensional (2D) carbon layers derived from the ultrathin 2D metal–organic framework precursor (ZIF-67). Electrochemical tests reveal that our approach not only stabilized Pt NPs successfully but also boosted Pt activities toward ORR and HER. We found that our Pt catalysts encapsulated in ultrathin 2D carbon layers exhibited an ORR activity of 5.9 and 12 times greater than those of the commercial Pt/C and Pt/RGO without 2D carbon layer protection. Our encapsulated Pt catalysts also show more than nine times higher stability than those of Pt/C catalysts. In addition to ORR, our novel encapsulated Pt catalysts display an extraordinary stability and activity toward HER, with a lower overpotential (14.3 mV in acidic media and 37.2 mV in alkaline media) at a current density of 10 mA cm–2 than Pt/C catalysts (23.1 mV in acidic media and 92.1 mV in alkaline media). The enhanced electrochemical activities and stability of our encapsulated Pt catalysts are attributed to the synergistic effect of Pt-based NPs and ultrathin 2D carbon layers derived from ZIF-67 with enriched active sites Co–Nx. First-principles simulations reveal that the synergistic catalysis of Pt-based NPs and Co–Nx derived from ZIF-67 improves the activity for ORR and HER.

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Идентификаторы

DOI: 10.1021/acsami.9b20781

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar