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Improved electrochemical hydrogen storage performance of Ti49Zr26Ni25 quasicrystal alloy by doping with mesoporous α-Fe2O3 particles
International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2018-03-17 , DOI: 10.1016/j.ijhydene.2018.02.149
Heng Liu , Xiaojie Zhai , Zhe Li , Xing Tao , Wanqiang Liu , Jianxun Zhao

A Ti49Zr26Ni25 quasicrystal alloy was prepared by mechanical alloying and subsequent annealing. Mesoporous α-Fe2O3 particles were obtained via a hydro-thermal procedure using chitosan as the template. Composites of Ti49Zr26Ni25 mixed with different amounts of mesoporous α-Fe2O3 were synthesized to enhance the electrochemical properties of Ti49Zr26Ni25. The structural characteristics of the alloy and composites were investigated using XRD, SEM, TEM and BET analysis. The electrochemical properties of the composite electrodes were tested using a three-electrode battery system at room temperature. The discharge capacities for the composites were higher than those for the Ti49Zr26Ni25 alloy and reached a maximum (259.6 mAh/g) for 5% additive content of α-Fe2O3. Moreover, the composites showed enhanced high-rate dischargeability. The capacity decay rate and charge-transfer resistance decreased after α-Fe2O3 loading. The preferable performance of the composite alloys may be attributed to the doping of mesoporous α-Fe2O3, which may play a catalytic effect in the kinetics of the electrochemical reactions. The large surface area and mesoporous structure of α-Fe2O3 may also be advantageous for rapid transmission of hydrogen in the interior of the alloy, thus improving the discharge capacity of the alloy electrode.



中文翻译:

钛改善电化学储氢性能49的Zr 2625通过与孔掺杂准晶合金的α-Fe 2 ö 3个颗粒

通过机械合金化和随后的退火来制备Ti 49 Zr 26 Ni 25准晶体合金。介孔的α-Fe 2 ö 3个经由使用壳聚糖作为模板水热方法得到颗粒。钛的复合材料49的Zr 2625与不同量的中孔的混合的α-Fe 2 ö 3合成,以提高钛的电化学性质49的Zr 2625。使用XRD,SEM,TEM和BET分析研究了合金和复合材料的结构特征。在室温下使用三电极电池系统测试了复合电极的电化学性能。用于复合材料的放电容量比用于较高的Ti 49 Zr的2625合金和达到的α-Fe的5%的添加剂含量的最大(259.6毫安/克)2 ö 3。此外,该复合材料显示出较高的高倍率放电性能。后的α-Fe的容量衰减率和电荷转移电阻降低2 ö 3加载中。复合合金的优选的性能可以归因于介孔的α-Fe的掺杂2 Ó 3,其可以在电化学反应的动力学中发挥催化作用。的大的表面积和的α-Fe的介孔结构2 ö 3也可以是用于在合金内部的氢快速传输是有利的,从而提高了合金电极的放电容量。

更新日期:2018-03-17
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