DataVXAdvanced MaterialsPaper
journal article·2023-02

Ultrastable Fe–N–C Fuel Cell Electrocatalysts by Eliminating Non‐Coordinating Nitrogen and Regulating Coordination Structures at High Temperatures

Dongsheng Xia, Xuan Tang, Sheng Dai, Rile Ge, Alexander Rykov, Junhu Wang, Tzu‐Hsi Huang, Kuan‐Wen Wang, Yinping Wei, Kai Zhang, Jia Li, Lin Gan, Feiyu Kang

Advanced Materials· Volume 35· Issue 5
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Source abstract

Abstract

Abstract Pyrolyzed Fe–N–C materials have attracted considerable interest as one of the most active noble‐metal‐free electrocatalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). Despite significant progress is made in improving their catalytic activity during past decades, the Fe–N–C catalysts still suffer from fairly poor electrochemical and storage stability, which greatly hurdles their practical application. Here, an effective strategy is developed to greatly improve their catalytic stability in PEMFCs and storage stability by virtue of previously unexplored high‐temperature synthetic chemistry between 1100 and 1200 °C. Pyrolysis at this rarely adopted temperature range not only enables the elimination of less active nitrogen‐doped carbon sites that generate detrimental peroxide byproduct but also regulates the coordination structure of Fe–N–C from less stable D1 (O–FeN4C12) to a more stable D2 structure (FeN4C10). The optimized Fe–N–C catalyst exhibits excellent stability in PEMFCs (>80% performance retention after 30 h under H2/O2 condition) and no activity loss after 35 day storage while maintaining a competitive ORR activity and PEMFC performance.
Source: crossref · Quality: baseline

Research context

Catalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shenzhen Geim Graphene Research Center Institute of Materials Research Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 P. R. China

Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Centre Frontiers Science Center for Materiobiology and Dynamic Chemistry Institute of Fine Chemicals School of Chemistry and Molecular Engineering East China University of Science & Technology Shanghai 200237 P. R. China

Center for Advanced Mössbauer Spectroscopy Mössbauer Effect Data Center Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China

Institute of Materials Science and Engineering National Central University Taoyuan 320 Taiwan

Funding

National Natural Science Foundation of China · China Postdoctoral Science Foundation · Fundamental Research Funds for the Central Universities

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