Abstract
Co–Mn oxides are a group of highly effective non-precious metal oxygen reduction reaction (ORR) catalysts for alkaline polymer electrolyte fuel cells (APEFCs). Despite being widely studied in alkaline solutions, limited studies of them have been developed in APEFCs. In this work, we evaluate the performance of a rock-salt-type Co–Mn composite oxides (CoMnO 2 /C) in both alkaline solution and APEFCs. Other than that, we also test its durability in APEFCs and investigate its degradation mechanism. CoMnO 2 /C exhibits a high ORR activity in both rotate disk electrode (RDE) study and APEFCs test. The ORR half-wave potential is 0.86 V in 1 M KOH, and the peak power density (PPD) reaches 1.2 W/cm 2 in H 2 –O 2 APEFCs when using PtRu as anode. In air (CO 2 -free) condition, APEFC reaches a PPD of 0.83 W/cm 2 , and can operate over 40 h at a constant current density of 200 mA/cm 2 . Further experiments reveal that the cell performance degradation can be ascribed to the dissolution and valence increase of Mn from +3 to +3.6 on the catalysts surface. • CoMnO 2 /C exhibits high performance in both alkaline solution and APEFCs. • In air (CO 2 -free) condition, CoMnO 2 /C reaches a PPD of 0.83 W/cm 2 . • APEFCs using CoMnO 2 /C cathode can operate over 40 h at 200 mA/cm 2 . • Cell performance degradation is due to the dissolution and valence increase of Mn.
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