Pt-Like Oxygen Reduction Activity Induced by Cost-Effective MnFeO2/N-Carbon

Zhou, QX (Zhou, Qixing)[ 1 ] ; Su, ZB (Su, Zhangbin)[ 1 ] ; Tang, YD (Tang, Yidan)[ 1 ] ; Ai, L (Ai, Li)[ 1 ] ; Fu, GT (Fu, Gengtao)[ 1,3 ]*; Wu, ZX (Wu, Zexing)[ 2 ] ; Sun, DM (Sun, Dongmei)[ 1 ]*（孙冬梅）; Tang, YW (Tang, Yawen)[ 1 ]*（唐亚文）

[ 1 ] Nanjing Normal Univ, Jiangsu Key Lab New Power Batteries, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Sch Chem & Mat Sci, Nanjing 210023, Jiangsu, Peoples R China

[ 2 ] Qingdao Univ Sci & Technol, Key Lab Base Ecochem Engn, Coll Chem & Mol Engn, Qingdao 266042, Shandong, Peoples R China

[ 3 ] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637459, Singapore

CHEMISTRY-A EUROPEAN JOURNAL，201904,25(24),6226-6232

The development of effective and affordable electrocatalysts for the oxygen reduction reaction (ORR) is critical for the renewable-energy technologies. Here, we present a new manganese iron oxide (MnFeO2) as a cost-effective material for the ORR with Pt-like electrochemical properties. Pyrolysis of hybrid agar hydrogel on NaCl nanocrystals furnishes a unique structure in which the active MnFeO2 particles are uniformly immobilized in the nitrogen-doped porous carbon aerogels (MnFeO2/NPC). Nitrogen-doped carbon is introduced to construct porous mass-transfer channels and reduce self-aggregation of the MnFeO2 particles. It is found that the formation of the MnFeO2 phase greatly depends on the pyrolysis temperature. Benefiting from the synergy of MnFeO2 and NPC, the MnFeO2/NPC can actually be as good as the Pt/C catalyst for the ORR, with an onset-potential of 0.98 V and a half-wave potential of 0.86 V, combined with demonstrating a superior stability and tolerance to methanol.

文章链接：

https://onlinelibrary.wiley.com/doi/full/10.1002/chem.201900638

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