Abstract
Integration of highly active electrocatalysts and three-dimensional (3D) conductive frameworks to create a stable and highly efficient air electrode with low overpotential under high discharge current density is a key approach to realize the commercialization of metal air batteries, which involve the oxygen reduction reaction (ORR) at the cathode end. We develop a self-reduction synthesis method for the fabrication of silver-carbon fiber paper (Ag-CFP) as an air electrode of aluminum air (Al-air) batteries. The obtained Ag-CFP is characterized as oxygen electrode by using Cyclic voltammograms (CVs), linear sweep voltammograms (LSVs) and Rotating Disk Electrode (RDE) voltammetrys techniques. The results demonstrated that the Ag-CFP exhibited promising ORR performance. Kouteckye-Levich analysis indicated that a two-electron reaction was favored for the ORR mechanism of the Ag-CFP electrode. A home-built Al-air cell was used to further determine the cathode performance under real operation condition. The resulting primary Al-air battery showed an impressive discharge peak power density of 108.1 mW cm−2, specific capacity of 2917 mA h g−1 and energy density of 4346 W h kg−1, outperforming that of commercial Ag powder air electrode.
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