Effect of Synergistic Anticorrosion Treatments on Cycling Stability of Mg-Based Hydrogen Storage Electrode
来源期刊：JOURNAL OF RARE EARTHS2006年增刊第2期
论文作者：Li Baoquan Xiong Wei Kong Fanqing Yan Huizhong An Shengli Wang Yan Li Jin
Key words：hydrogen storage materials; MgNi; La2Mg17; anti-corrosion agent; hydride electrode; cycling stability; rare earths;
Abstract: In this paper, any two of the three anticorrosion agents, that is emulsifier (OP-10), soluble glass (Na2O·nSiO2) and glycerin (C3H8O3), were treated simultaneously on the surface of amorphous (a-) MgNi+5% Ml2Mg17 (Ml denotes the lanthanum-rich mish metal) electrode and the electrolyte. Effect of the synergistic anticorrosion treatment on charging/discharging cycle stability of the electrode was investigated. Contrasted with single treatment method, the cycling stability of the electrodes was further improved. The desirable synergistic anticorrosion method was that the electrode was treated by the soluble glass, and that OP-10 was added into the electrolyte. The cyclic voltammogram (CV) results of the electrode show clearly that the anticorrosion agent can change the electrochemical activity and mechanism of the electrode. The concentration of the anticorrosion agent in the electrolyte treated by the synergistic anticorrosion method was also investigated. The appropriate concentration of the anticorrosion agents in the electrolyte is 0.143%.
Li Baoquan1，Xiong Wei1，Kong Fanqing1，Yan Huizhong1，An Shengli2，Wang Yan1，Li Jin1
(1.Baotou Research Institute of Rare Earths, Baotou 014010, China;
2.College of Material and Metallurgy Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
3.College of Mechanical Engineering, South China University of Technology, Guangzhou 510641, China)
Abstract:In this paper, any two of the three anticorrosion agents, that is emulsifier (OP-10), soluble glass (Na2O·nSiO2) and glycerin (C3H8O3), were treated simultaneously on the surface of amorphous (a-) MgNi+5% Ml2Mg17 (Ml denotes the lanthanum-rich mish metal) electrode and the electrolyte. Effect of the synergistic anticorrosion treatment on charging/discharging cycle stability of the electrode was investigated. Contrasted with single treatment method, the cycling stability of the electrodes was further improved. The desirable synergistic anticorrosion method was that the electrode was treated by the soluble glass, and that OP-10 was added into the electrolyte. The cyclic voltammogram (CV) results of the electrode show clearly that the anticorrosion agent can change the electrochemical activity and mechanism of the electrode. The concentration of the anticorrosion agent in the electrolyte treated by the synergistic anticorrosion method was also investigated. The appropriate concentration of the anticorrosion agents in the electrolyte is 0.143%.
Key words:hydrogen storage materials; MgNi; La2Mg17; anti-corrosion agent; hydride electrode; cycling stability; rare earths;
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