Chemical Vapor Deposition for Atomically Dispersed and Nitrogen Coordinated Single Metal Site Catalysts

Angewandte Chemie - International Edition - Tập 59 Số 48 - Trang 21698-21705 - 2020
Shengwen Liu1,2, Maoyu Wang3,2, Xiaoxuan Yang1,2, Qiurong Shi1, Zhi Qiao1, Marcos Lucero3, Qing Ma4, Karren L. More5, David A. Cullen5, Zhenxing Feng3, Gang Wu1
1Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260 USA
2these authors contributed equally to this work
3School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR, 97331 USA
4DND-CAT, Synchrotron Research Center, Northwestern University, Evanston, IL, 60208, USA
5Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.

Tóm tắt

AbstractAtomically dispersed and nitrogen coordinated single metal sites (M‐N‐C, M=Fe, Co, Ni, Mn) are the popular platinum group‐metal (PGM)‐free catalysts for many electrochemical reactions. Traditional wet‐chemistry catalyst synthesis often requires complex procedures with unsatisfied reproducibility and scalability. Here, we report a facile chemical vapor deposition (CVD) strategy to synthesize the promising M‐N‐C catalysts. The deposition of gaseous 2‐methylimidazole onto M‐doped ZnO substrates, followed by an in situ thermal activation, effectively generated single metal sites well dispersed into porous carbon. In particular, an optimal CVD‐derived Fe‐N‐C catalyst exclusively contains atomically dispersed FeN4 sites with increased Fe loading relative to other catalysts from wet‐chemistry synthesis. The catalyst exhibited outstanding oxygen‐reduction activity in acidic electrolytes, which was further studied in proton‐exchange membrane fuel cells with encouraging performance.

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Angewandte Chemie - International Edition

Tập 59 Số 48

21698-21705

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