ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
V3.docx (1.95 MB)
0/0

High-Performance Iron-Based ORR Catalysts Synthesized via Chemical Vapor Deposition

preprint
submitted on 29.10.2019 and posted on 31.10.2019 by Li Jiao, Jingkun Li, Lynne K. LaRochelle Richard, Thomas Stracensky, Ershuai Liu, Qiang Sun, Moulay-Tahar Sougrati, Zipeng Zhao, Fan Yang, Sichen Zhong, Hui Xu, Sanjeev Mukerjee, Yu Huang, Deborah J. Myers, Frédéric Jaouen, Qingying Jia
A Fe-N-C catalyst was synthesized via chemical vapor deposition (CVD) of gas phase FeCl3 onto a metal organic framework (MOF)-derived N-doped carbon (N-C) substrate at 750 ℃. This catalyst exhibits an unprecedented current density of 0.033 mA·cm-2 at 0.90 ViR-free (IR-corrected) and 0.044 mA·cm-2 at 0.89 ViR-free in a H2-O2 proton exchange membrane fuel cell under 1.0 bar and 80 ℃ conditions. The exceptional ORR activity of this catalyst is attributed to the ultra-high density of the Fe(II)-N4 sites. The high density of Fe(II)-N4 sites is realized by CVD that allows for the ready formation of Fe(II)-N4 sites via direct incorporation of gas phase FeCl3 into microporous N-C defects at relatively low temperatures. At these low temperatures, the doped N and Fe(II)-N4 are better preserved as compared to those in previous Fe-N-C catalysts synthesized via pyrolysis of the mixture of Fe, N, and C precursors at 1000 ± 100 ℃.

History

Email Address of Submitting Author

q.jia@neu.edu

Institution

Northeastern University

Country

United States

ORCID For Submitting Author

0000-0002-4005-8894

Declaration of Conflict of Interest

The authors declare no competing financial interests.

Exports

Logo branding

Exports