材料科学
催化作用
电催化剂
化学工程
化学
纳米技术
物理化学
电化学
电极
有机化学
工程类
作者
Peter M. Schneider,Kathrin L. Kollmannsberger,Cristiana Cesari,Rachit Khare,Maxime Boniface,Beatriz Roldán Cuenya,Thomas Lunkenbein,Martin Elsner,Stefano Zacchini,Aliaksandr S. Bandarenka,Julien Warnan,Roland A. Fischer
标识
DOI:10.1002/celc.202300476
摘要
Abstract To reduce the costs of proton exchange membrane fuel cells, the amount of Pt necessary to drive efficient oxygen reduction reaction (ORR) should be minimized. Particle nanostructuring, (nano‐)alloying, and metal‐doping can yield higher activities per Pt mass through tailoring catalysts owning a high number of active sites and precise electronic properties. In this work, the atom‐precise [NBnMe 3 ] 2 [Co 8 Pt 4 C 2 (CO) 24 ] ( Co 8 Pt 4 ) cluster is encapsulated and activated in a zeolitic imidazolate framework (ZIF)‐8, which unlocks the access to defined, bare Pt−Co nanoclusters, Co 8±x Pt 4±y NC@ZIF‐8, for the fabrication of highly active ORR catalysts. Upon controlled C‐interfacing and ZIF‐8‐digestion, Co‐doped Pt NPs (Pt 27 Co 1 ) with a homogenous and narrow size distribution of (1.1±0.4) nm are produced on Vulcan® carbon. Restructuring of the Pt 27 Co 1 /C catalyst throughout the ORR measurement was monitored via high‐angle annular dark field‐scanning transmission electron microscopy and X‐ray photoelectron spectroscopy. The measured ORR mass activity of (0.42±0.07) A mg Pt −1 and the specific activity of (0.67±0.06) mA cm ECSA −2 compare favourably with the catalyst obtained by direct C‐interfacing the pristine Co 8 Pt 4 cluster and with state‐of‐the‐art Pt/C reference catalysts. Our results demonstrate the potential of ZIF‐8‐mediated Pt−Co NP synthesis toward devising ORR catalysts with high Pt‐mass activity.
科研通智能强力驱动
Strongly Powered by AbleSci AI