Gas diffusion electrodes(GDEs)with Ag/y-MnCb bimetallic catalytic composition for metal hydride/air batteries

摘要

The gas diffusion electrode(GDE)consists of a carbon-based gas diffusion layer(GDL)and an active layer(AL).In this study GDE with bimetallic AL containing Ag/γ-MnO2 was investigated and compared with previously optimized GDE with Ag/Co3O4 composition.The catalytic structure was created by depositing of a mixture of catalysts containing γ-MnO2 and Ag with a weight ratio between the two components of 1:1.The prepared electrodes were examined before and after work by XRD phase analysis.The morphology of the above-studied ALs and GDL was investigated with scanning electron microscopy(SEM)and BET analysis,respectively.The polarization,charge/discharge tests and impedance analysis were carried out in a half-cell configuration in 6M KOH.Long-term tests of the two GDEs showed good mechanical and electrochemical stability of over 300-500 charge/discharge cycles.