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Chemical vapour deposition of Fe-N-C oxygen reduction catalysts with full utilization of dense Fe-N 4 sites

Nature materials, 2021-10, Vol.20 (10), p.1385 [Peer Reviewed Journal]

2021. The Author(s), under exclusive licence to Springer Nature Limited. ;EISSN: 1476-4660 ;DOI: 10.1038/s41563-021-01030-2 ;PMID: 34112977

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  • Title:
    Chemical vapour deposition of Fe-N-C oxygen reduction catalysts with full utilization of dense Fe-N 4 sites
  • Author: Jiao, Li ; Li, Jingkun ; Richard, Lynne LaRochelle ; Sun, Qiang ; Stracensky, Thomas ; Liu, Ershuai ; Sougrati, Moulay Tahar ; Zhao, Zipeng ; Yang, Fan ; Zhong, Sichen ; Xu, Hui ; Mukerjee, Sanjeev ; Huang, Yu ; Cullen, David A ; Park, Jae Hyung ; Ferrandon, Magali ; Myers, Deborah J ; Jaouen, Frédéric ; Jia, Qingying
  • Is Part Of: Nature materials, 2021-10, Vol.20 (10), p.1385
  • Description: Replacing scarce and expensive platinum (Pt) with metal-nitrogen-carbon (M-N-C) catalysts for the oxygen reduction reaction in proton exchange membrane fuel cells has largely been impeded by the low oxygen reduction reaction activity of M-N-C due to low active site density and site utilization. Herein, we overcome these limits by implementing chemical vapour deposition to synthesize Fe-N-C by flowing iron chloride vapour over a Zn-N-C substrate at 750 °C, leading to high-temperature trans-metalation of Zn-N sites into Fe-N sites. Characterization by multiple techniques shows that all Fe-N sites formed via this approach are gas-phase and electrochemically accessible. As a result, the Fe-N-C catalyst has an active site density of 1.92 × 10 sites per gram with 100% site utilization. This catalyst delivers an unprecedented oxygen reduction reaction activity of 33 mA cm at 0.90 V (iR-corrected; i, current; R, resistance) in a H -O proton exchange membrane fuel cell at 1.0 bar and 80 °C.
  • Publisher: England
  • Language: English
  • Identifier: EISSN: 1476-4660
    DOI: 10.1038/s41563-021-01030-2
    PMID: 34112977
  • Source: ProQuest Central
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