2 research outputs found

    Corrosion Behavior of Mg_(1.85)Mm_(0.15)Ni Hydrogen Storage Alloy Modified by Electroless Cu in CH_3OH·H_2O Solutions

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     采用稳态极化曲线法和交流阻抗法研究了在甲醇 水不同含量镀液中化学镀铜的Mg1.85Mm0.15Ni(Mm∶富铈混合稀土)储氢合金于强碱性溶液中的抗腐蚀性能.结果表明,对甲醇_水体系化学镀铜,合金的抗腐蚀性可进一步改善.其中以甲醇体积比含量为40%的镀液施镀的抗腐蚀效果最佳.稳态极化曲线测试给出,此时合金的腐蚀电流密度只有5.6mA·cm-2,相应的电化学反应阻抗为22.25Ω·cm2,而原粉的两者之值分别为11.7mA·cm-2和1.99Ω·cm2.The corrosion behavior of the Mg1.85Mm0.15Ni (Mm:Ce_rich mischmetal) alloy modified by electroless Cu coating in different CH3OH_H2O solutions has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. These results showed that the corrosion behavior was improved after electroless Cu. The potentiodynamic polarization and electrochemical impedance spectroscopy results showed that the alloy electrode had more promising anti_corrosion behavior after coated in a 40%CH3OH_H2O solution. The values of corrosion current density and electrode reaction resistance were 5.6 mA·cm-2(11.7 mA·cm-2 for uncoated alloy electrode) and 22.25 Ω·cm2 (1.99 Ω·cm2 for the uncoated alloy electrode), respectively.作者联系地址:南开大学能源材料化学研究所,南开大学能源材料化学研究所,南开大学能源材料化学研究所,南开大学能源材料化学研究所,南开大学能源材料化学研究所 天津300071 ,天津300071 ,天津300071 ,天津300071 ,天津300071Author's Address: College of Chemistry Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071,Chin

    Preparation and Electrochemical Preformance of Zn-La Alloys

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     采用固相扩散法合成Zn_La合金,并研究La对锌电极化学性能的影响.实验表明:La的适量添加能抑制锌电极的枝晶及腐蚀等问题,从而明显改善锌电极的循环性能,其中以0.5at.%La的添加量为最佳.在100mA/g电流密度下,循环80周期后,其放电容量仍达520mAh/g,XPS测试表明,La主要以La2O3/La(OH)3的形式附着在锌电极表面上.正是由于La2O3/La(OH)3的存在,显著改善了锌电极的循环充放电寿命.Zn_La alloys were prepared by solid phase diffusion method and the effects of La on the electrochemical performance of zinc electrodes were investigated using potentiostatic polarization technique and charging/discharging cycle test. The results showed that adding La to zinc electrode remarkably suppressed the zinc dendrite, the shape of zinc electrode and zinc corrosion, and hence, markedly improved the cycle performance of zinc electrodes. The discharging capacity of the zinc electrode containing 0.5at.% La which was the optimum was still 520 mAh/g after it cycled 80s at the current of 100 mA. The XPS showed that La element mainly adhered on the surface of the zinc electrode in the form of La2O3/La(OH)3 that evidently enhanced the cycle life of the secondary zinc electrode.作者联系地址:南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所 天津300071 ,天津300071 ,天津300071 ,天津300071 ,天津300071 ,天津300071 ,天津300071Author's Address: Institute of the New Energy Material Chemistry,Nankai University,Tianjin 300071,Chin
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