不同空气阴极表面结构之锌-空气燃料电池性能

Performance of zinc-air fuel cells with different cathode surface structures

本论文主要针对锌-空气燃料电池之空气阴极表面结构进行改善.锌-空气燃料电池主要以氢氧化钾为电解液,利用不同空气电极表面结构进行空气阴极性能与寿命研究.实验中进行了开回路电压性能测试与定电流放电测试,并讨论其两者电压-电流性能及功率密度差异,比较不同表面结构阴极的对电解液的抗蚀能力,针对放电完的电池电极进行材料分析.由实验结果得知,如此类似保护膜功用之电极表面结构在电池反应时,能够减少电解液本身以及阳极金属氧化物对空气电极表面的影响,提供较长时间稳定电流输出,大大地提升锌-空气燃料电池空气电极之使用寿命.

This paper presents a cathode surface structure to improve the performance of a zinc-air fuel cell（ZAFC）.The electrolyte of the zinc-air fuel cell was made by mixing organic inhibitor with a potassium hydroxide solution.Open-circuit voltage performance test and constant-current discharge test were carried out to investigate the differences in voltage-current characteristics and power density of the zinc-air fuel cells with different cathode surface structures and to compare the corrosion resistances of different air-cathodes in the electrolyte.The materials analysis and microstructure observation of air-cathodes after discharging were performed by X-ray diffraction（XRD） and scanning electron microscopy（SEM）,respectively.Experimental results show that a protection layer on the air-cathode can increase the durability and corrosion resistance of the electrode.This electrode structure is able to decrease corrosion damage occurred at the air-cathode surface and provide a stable electrochemical reaction.It can improve the utilization of the air-cathode greatly in the zinc-air fuel cell.