化学镀Ni-P非晶Ti_2Ni_(0.95)Zn_(0.05)的储氢性能

Hydrogen storage performance of amorphous Ti_2Ni_(0. 95)Zn_(0. 05)after electroless Ni-P

采用XRD、SEM及电化学测试,研究化学镀Ni-P对非晶Ti2Ni0.95Zn0.05合金电化学储氢性能的影响。活化处理可除去合金表面的氧化层,合金的最大放电比容量由135.0 mAh/g增加到143.7 mAh/g,阻抗由288.4 mΩ减小到212.7 mΩ;2 h的化学镀可在合金表面形成完整Ni-P镀层,增强合金在25℃及40℃时的耐腐蚀性能,使25℃下30次循环[以60 mA/g的电流充电6 h,放电至-0.6 V(vs.Hg/HgO)]的容量保持率由88.0%增加到93.9%;化学镀也增强了合金的高倍率放电性能,电流为900 mA/g时,最大放电比容量由29.7 mAh/g增加到49.0 mAh/g。

Effects of electroless nickel （ Ni ）-phosphorus （P） on electrochemical hydrogen storage performance of amorphous Ti2 Ni0.95 Zn0.05 alloy were studied by XRD, SEM and electrochemical performance tests. The activation treatment could remove oxide layer on the surface of alloy,the maximum specific discharge capacity of alloy increased from 135. 0 mAh/g to 143.7 mA/g,the impedance decreased from 288.4 mΩ to 212.7 mΩ;a complete Ni-P layer was coated on alloy surface after 2 h electroless,Ni-P layer could enhance the corrosion resistance of alloy at 25 ℃ and 40 ℃, the capacity retention rate in the 30th cycle [ electrodes were charged at 60 mA/g for 6 h,then discharged to -0. 6 V（vs. Hg/HgO） ] at 25 ℃ increased from 88. 0% to 93.9% ,the high-rate discharge performance of the alloy was enhanced after electroless, the specific discharge capacity increased from 29.7 mAh/g to 49. 0 mAh/g when the current was 900 mA/g.