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Title: Iron-Free Cathode Catalysts for Proton-Exchange-Membrane Fuel Cells: Cobalt Catalysts and the Peroxide Mitigation Approach

Abstract

Exploring high-performance and low-cost platinum group metal (PGM)-free catalysts for the oxygen reduction reaction (ORR) is a promising strategic pathway to decrease the cost of current proton exchange membrane fuel cells (PEMFCs). In recent years, transition metals (Fe, Co, etc.) and nitrogen co-doped carbon materials (M-N-C) have demonstrated promising activity and stability. Although significant progress has been achieved for Fe-N-C catalysts, there is a potential concern of Fenton reactions between Fe2+ and H2O2 with the formation of free radicals, which cause the degradation of catalysts, ionomers and membrane used in PEMFCs. Co-N-C catalysts have been explored as an alternative with significantly mitigated Fenton reactions relative to Fe. In this review, we focus on the Co-N-C catalysts in acidic medium relevant to PEMFC applications. Catalyst synthesis, structure/morphology, activity and stability improvement, and reaction mechanism are discussed. Through reviewing experimental and theoretical results, we aim to elucidate the correlations between structure/morphology and activity and provide guidance for rational design of advanced Co catalysts with special emphasis on atomically dispersed Co catalysts. To reduce the peroxide generation during the ORR on Co catalysts, potential strategies are outlined to minimize the detrimental effect of peroxide for the enhancement of fuel cell durability.

Authors:
 [1]; ORCiD logo [2];  [1]; ORCiD logo [2];  [3]
  1. State University of New York at Buffalo
  2. BATTELLE (PACIFIC NW LAB)
  3. State University of New York
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1575418
Report Number(s):
PNNL-SA-141392
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 31; Journal Issue: 31
Country of Publication:
United States
Language:
English

Citation Formats

Wang, Xiao Xia, Prabhakaran, Venkateshkumar, He, Yanghua, Shao, Yuyan, and Wu, Gang. Iron-Free Cathode Catalysts for Proton-Exchange-Membrane Fuel Cells: Cobalt Catalysts and the Peroxide Mitigation Approach. United States: N. p., 2019. Web. doi:10.1002/adma.201805126.
Wang, Xiao Xia, Prabhakaran, Venkateshkumar, He, Yanghua, Shao, Yuyan, & Wu, Gang. Iron-Free Cathode Catalysts for Proton-Exchange-Membrane Fuel Cells: Cobalt Catalysts and the Peroxide Mitigation Approach. United States. doi:10.1002/adma.201805126.
Wang, Xiao Xia, Prabhakaran, Venkateshkumar, He, Yanghua, Shao, Yuyan, and Wu, Gang. Fri . "Iron-Free Cathode Catalysts for Proton-Exchange-Membrane Fuel Cells: Cobalt Catalysts and the Peroxide Mitigation Approach". United States. doi:10.1002/adma.201805126.
@article{osti_1575418,
title = {Iron-Free Cathode Catalysts for Proton-Exchange-Membrane Fuel Cells: Cobalt Catalysts and the Peroxide Mitigation Approach},
author = {Wang, Xiao Xia and Prabhakaran, Venkateshkumar and He, Yanghua and Shao, Yuyan and Wu, Gang},
abstractNote = {Exploring high-performance and low-cost platinum group metal (PGM)-free catalysts for the oxygen reduction reaction (ORR) is a promising strategic pathway to decrease the cost of current proton exchange membrane fuel cells (PEMFCs). In recent years, transition metals (Fe, Co, etc.) and nitrogen co-doped carbon materials (M-N-C) have demonstrated promising activity and stability. Although significant progress has been achieved for Fe-N-C catalysts, there is a potential concern of Fenton reactions between Fe2+ and H2O2 with the formation of free radicals, which cause the degradation of catalysts, ionomers and membrane used in PEMFCs. Co-N-C catalysts have been explored as an alternative with significantly mitigated Fenton reactions relative to Fe. In this review, we focus on the Co-N-C catalysts in acidic medium relevant to PEMFC applications. Catalyst synthesis, structure/morphology, activity and stability improvement, and reaction mechanism are discussed. Through reviewing experimental and theoretical results, we aim to elucidate the correlations between structure/morphology and activity and provide guidance for rational design of advanced Co catalysts with special emphasis on atomically dispersed Co catalysts. To reduce the peroxide generation during the ORR on Co catalysts, potential strategies are outlined to minimize the detrimental effect of peroxide for the enhancement of fuel cell durability.},
doi = {10.1002/adma.201805126},
journal = {Advanced Materials},
number = 31,
volume = 31,
place = {United States},
year = {2019},
month = {8}
}