A Novel Porous Electronic Conducting Ceramics Loaded with Silver Nanoparticles as Cathode for Zinc-Air Batteries

【Author】

WENG Xiao-Lin;LIU Pei-Pei;ZHANG Ya-Peng;LIU Jiang;LIU Mei-Lin

【Institution】

Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology;Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology;Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology;Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology;Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology;School of Materials Science and Engineering, Georgia Institute of Technology

【Abstract】

Zinc-air battery has great advantages such as high energy density, low cost and environmental friendliness. Air electrode plays an important role in electrochemical performance of a zinc-air battery. In this paper, we report our study of a novel air electrode on which a porous perovskite ceramic La 0.7Sr 0.3CoO 3? δ (LSC) with Ag nanoparticles is directly grown. The porous LSC was used as substrate while Ag as catalyst. The porous structure of substrate attributed to the amount and dispersion of Ag nanoparticles which affected the electrochemical performance of air electrode. Therefore, the property of the Ag-LSC electrode was optimized by adjusting the mass content of pore former (starch). The experimental results show that the Ag-LSC electrode, with a porosity of ~32% and a Ag load of ~30 mg/cm 2, exhibits the best performance in all tested samples, and a zinc-air battery assembled with such air electrode gives the maximum power density of 141 mW/cm. What’s more, in order to ensure the gas diffusion channels, the hydrophilicity and hydrophobicity of the cathode are modified with PTFE to prevent flooding. After all that, the lifetime of the zinc-air battery, with optimization by coating a PTFE layer as hydrophobic agent on the surface of the selected Ag-LSC electrode, is prolonged significantly.

【Keywords】

zinc-air battery;air electrode;silver nanoparticle;porous La 0.7Sr 0.3CoO 3? δ substrate

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