| WANG Xin-ying,HUANG Hong-xia,LI Guo-hui,XIE Wen-qiang,LIU Zheng.Surface Modification of AB3-type Hydrogen Storage Alloy by Double Schiff Base[J],44(8):49-54 |
| Surface Modification of AB3-type Hydrogen Storage Alloy by Double Schiff Base |
| Received:April 23, 2015 Revised:August 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.08.009 |
| KeyWord:double Schiff base AB3 -type hydrogen storage alloy surface treatment charge-discharge properties kinetic properties |
| Author | Institution |
| WANG Xin-ying |
Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials,Guilin University of Technology, Guilin , China |
| HUANG Hong-xia |
Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials,Guilin University of Technology, Guilin , China |
| LI Guo-hui |
Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials,Guilin University of Technology, Guilin , China |
| XIE Wen-qiang |
Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials,Guilin University of Technology, Guilin , China |
| LIU Zheng |
Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials,Guilin University of Technology, Guilin , China |
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| Abstract: |
| Objective To improve the charge-discharge and kinetic properties of AB3-type hydrogen storage alloy electrode of Ni/ MH rechargeable batteries. Methods A kind of double Schiff base was synthesized. AB3-type hydrogen storage alloy La0. 73Ce0. 18Mg0. 09Ni3. 20Al0. 21Mn0. 10Co0. 60 was modified by using double Schiff base as a modifier, and the effect of adding different amount of double Schiff base on the charge-discharge and kinetic properties of the treated alloy were systematically investigated. Results The UV spectrogram and the infrared spectrogram showed that the target double Schiff base was synthesized. After surface treatment, the phase structure was not changed. The maximum discharge capacity increased from 375. 3 mAh / g to 376. 4 mAh / g, which was not a big change. After 50 cycles, the cycle stability of the alloy electrodes was improved from the original 62. 6% to 81. 1% (adding 5% double Schiff base). Moreover, the corrosion potential Ec increased from -0. 902 V to -0. 853 V, the exchange current density I0 increased from 53. 8 mA / g to 142. 5 mA / g, the limiting current density IL increased from the original 511. 6 mA / g to 872. 8 mA / g, and the electrochemical impedance spectra showed that the charge-transfer resistance between the alloy surface and the electrolyte decreased. Conclusion The comprehensive electrochemical properties such as cycle stability and the corrosion potential were considerably improved after the addition of double Schiff base. The double Schiff enhanced the corrosion resistance of the alloy in the alkali electrolyte. So adding double Schiff base was a good way to improve the comprehensive electro-chemical properties of hydrogen storage alloy. |
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