Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7720290 | International Journal of Hydrogen Energy | 2014 | 5 Pages |
Abstract
Ba0.9Co0.5Fe0.4Nb0.1O3 (BCFN) perovskite has been synthesized by a solid-state reaction method, and characterized by XRD, SEM, BET. This oxide has a porous structure and a specific surface area of 10.24Â m2Â gâ1 after ball-milled 24Â h. The catalytic activity of the oxide for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in 0.1Â M KOH solution has been studied by using a rotating ring-disk electrode (RRDE) technique. RRDE results show that the ORR mainly favors a direct four electron pathway, and a maximum cathodic current density of â5.70Â mAÂ cmâ2 at 2500Â rpm was obtained, which is close to that of Pt/C (20Â wt.% Pt on carbon) electrocatalyst in the same testing conditions. Compared with behaviors of pure C and Pt/C electrode, a lower onset potential of BCFN for OER is observed, and a bigger anodic current at the same applied potential is obtained. Considering small surface area of the BCFN catalyst, a big overpotential is given in the discharge-charge curves. However, the outputs of 2032 coin Li-air batteries in a dry gas mixture composed of 80Â vol.% pure N2 and 20Â vol.% pure O2 demonstrated that BCFN could be a potential bifunctional catalyst for the Li-air battery.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Chao Jin, Zhibin Yang, Xuecheng Cao, Fanliang Lu, Ruizhi Yang,