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通过添加聚苯胺和化学沉积聚苯胺对La_(0.94)Mg_(0.06)Ni_(3.49)Co_(0.73)Mn_(0.12)Al_(0.20)储氢合金进行表面改性。XRD和SEM分析表明,无论是添加聚苯胺还是化学沉积聚苯胺,合金的相结构均未发生改变;添加聚苯胺改性合金的表面包覆上了珊瑚状的聚苯胺,化学沉积聚苯胺改性合金的表面较粗糙。添加聚苯胺改性合金电极的最大放电比容量由未改性合金的346.4mA·h/g提高到354.8mA·h/g,50个循环后的容量保持率由69.5%提高到73.0%;化学沉积聚苯胺改性合金电极的最大放电比容量降低至307.8mA·h/g,容量保持率提高到82.6%。动力学测试结果表明,添加聚苯胺改性合金的动力学性能得到提高,而化学沉积聚苯胺改性的合金动力学性能有所降低,但其抗腐蚀能力较强。因此,选择合适的聚苯胺改性方法十分关键。
The surface modification of La_ (0.94) Mg_ (0.06) Ni_ (3.49) Co_ (0.73) Mn_ (0.12) Al_ (0.20) hydrogen storage alloy was achieved by adding polyaniline and electroless deposition polyaniline. XRD and SEM analysis showed that the phase structure of the alloy did not change whether polyaniline or polyaniline was added. The surface of polyaniline-modified alloy was coated with coral polyaniline and polyaniline modified by chemical deposition The surface of the alloy is rough. The maximum discharge capacity of polyaniline-modified alloy electrode increased from 346.4mA · h / g to 354.8mA · h / g for unmodified alloy, and the capacity retention rate increased from 69.5% to 73.0% after 50 cycles. The chemical The maximum discharge specific capacity of the deposited polyaniline modified alloy electrode decreased to 307.8mA · h / g, the capacity retention rate increased to 82.6%. The kinetic test results show that the kinetic properties of polyaniline modified alloys are improved, while the kinetic properties of chemically deposited polyaniline modified alloys are reduced, but their corrosion resistance is stronger. Therefore, the selection of suitable polyaniline modification method is very crucial.