Is iron involved in the lack of stability of Fe/N/C electrocatalysts used to reduce oxygen at the cathode of PEM fuel cells?

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• 作者：Gaixia Zhang^a ; ¹ ; ^{gaixia.zhang@emt.inrs.ca}Author Vitae ; Ré ; gis Chenitz^a ; ¹ ; ^{chenitz@emt.inrs.ca}Author Vitae ; Michel Lefè ; vre^b ; ^{michel.lefevre@canetique.com}Author Vitae ; Shuhui Sun^a ; ^{shuhui@emt.inrs.ca}Author Vitae ; Jean-Pol Dodelet^a ; ^{dodelet@emt.inrs.ca}Author Vitae
• 关键词：Non-noble catalysts ; Non-noble metal ; ORR ; Instability ; Durability ; Carbon electro-oxidation
• 刊名：Nano Energy
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：29
• 期：Complete
• 页码：111-125
• 全文大小：1422 K
• 卷排序：29

文摘

H2/O2 PEM fuel cell current density curves of Fe/N/C catalysts at 0.6V and 80 °C show a fast decay of about 15h. H2O2 is not the cause of the fast decay, either by direct or indirect (Fenton) reaction with the catalytic sites. The electro-oxidation of the catalyst’s carbon supports induces water flooding in these initially hydrophobic catalysts. The characteristics of a catalyst that would perform ORR with a large majority of CNx catalytic sites were also defined.