Ni-B-C对La_(0.94)Mg_(0.06)Ni_(3.49)Co_(0.73)Mn_(0.12)Al_(0.20)储氢合金电化学性能的影响
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摘要
为提高新型AB_3型储氢合金La_(0.94)Mg_(0.06)Ni_(3.49)Co_(0.73)Mn_(0.12)Al_(0.20)的电化学性能,将球磨法制备的Ni-B-C粉末按不同质量分数添加到合金中。采用X射线粉末衍射仪(XRD)和扫描电子显微镜(SEM)分析合金的相结构和表面形貌。结果表明,添加Ni-B-C粉末后,合金相结构没有变化,仍由LaNi_5相和La_2Ni_7相2个相组成,但合金表面出现了细小颗粒。添加Ni-B-C粉末后,合金电极的最大放电容量和放电容量保持率均提高。当添加质量分数为10%的Ni-B-C粉末后,电极的最大放电容量从346 mAh/g增加到363 mAh/g,50个循环后的放电容量保持率从70%提高到77%,交换电流密度I0与极限电流密度IL分别为106和987 mA/g。动电位极化测试表明,电极的抗腐蚀能力也有所增强。综上,Ni-B-C可以提高AB_3型储氢合金的综合电化学性能。
Ni-B-C powder prepared by ball milling was introduced to improve the electrochemical properties of new AB_3-type hydrogen storage alloy La_(0.94)Mg_(0.06)Ni_(3.49)Co_(0.73)Mn_(0.12)Al_(0.20). The phase structure and surface morphology of the alloy were investigated by X-ray diffraction(XRD)and scanning electron microscope(SEM). The results show that the alloy remains the original LaNi_5 and La_2Ni_7 phases and some little particles appear on the surface of alloy after adding Ni-B-C. The addition of Ni-B-C improves the maximum discharge capacity and capacity retention rate.After adding a mass fraction of 10% Ni-B-C, the maximum discharge capacity increases from 346 mAh/g to 363 mAh/g, and the capacity retention rate after 50 cycles increases from 70% to 77%. The exchange current density I0 and the limiting current density IL reach 106 and 987 m A/g,respectively. Potentiodynamic polarization indicates that the corrosion resistance of the electrodes is enhanced. The Ni-B-C powder can improve the comprehensive electrochemical properties of the hydrogen storage alloy.
Ni-B-C powder prepared by ball milling was introduced to improve the electrochemical properties of new AB_3-type hydrogen storage alloy La_(0.94)Mg_(0.06)Ni_(3.49)Co_(0.73)Mn_(0.12)Al_(0.20). The phase structure and surface morphology of the alloy were investigated by X-ray diffraction(XRD)and scanning electron microscope(SEM). The results show that the alloy remains the original LaNi_5 and La_2Ni_7 phases and some little particles appear on the surface of alloy after adding Ni-B-C. The addition of Ni-B-C improves the maximum discharge capacity and capacity retention rate.After adding a mass fraction of 10% Ni-B-C, the maximum discharge capacity increases from 346 mAh/g to 363 mAh/g, and the capacity retention rate after 50 cycles increases from 70% to 77%. The exchange current density I0 and the limiting current density IL reach 106 and 987 m A/g,respectively. Potentiodynamic polarization indicates that the corrosion resistance of the electrodes is enhanced. The Ni-B-C powder can improve the comprehensive electrochemical properties of the hydrogen storage alloy.
引文
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[2]Dong Zhenwei,Wu Yaoming,Ma Liqun et al.Journal of Alloys and Compounds[J],2011,509(17):5280
[3]Giza K,Adamczyk L,Hackemer A et al.Journal of Alloys and Compounds[J],2015,645(S1):490
[4]Liu Yixin,Xu Liqin,Jiang Weiqing et al.International Journal of Hydrogen Energy[J],2009,34(7):2986
[5]Shen Wenzhou,Han Shumin,Li Yuan et al.Applied Surface Science[J],2012,258(17):6316
[6]Dong Zhenwei,Ma Liqun,Shen Xiaodong et al.International Journal of Hydrogen Energy[J],2011,36(1):893
[7]Li Rongfeng,Xu Peizhen,Zhao Yamin et al.Journal of Power Sources[J],2014,270:21
[8]Zhang Yanghuan,Li Penxing,Yang Tai et al.Transactions of Nonferrous Metals Society of China[J],2014,24(12):4012
[9]Lim K L,Liu Y N,Zhang Q A et al.International Journal of Hydrogen Energy[J],2017,42(37):23 737
[10]Li Yuan,Tao Yang,Ke Dandan et al.Applied Surface Science[J],2015,357:1714
[11]Hatano Y,Tachiakawa T,Mu D et al.Journal of Alloys and Compounds[J],2002,330-332:816
[12]Wang Yi,Qiao Shizhang,Wang Xin.International Journal of Hydrogen Energy[J],2008,33(3):1023
[13]Li Guohui(李国辉),Huang Hongxia(黄红霞),Wang Xinying(王新颖)et al.Chinese Journal of Inorganic Chemistry(无机化学学报)[J],2016,32(8):1358
[14]Huang Hongxia,Li Guohui,Wang Xinying et al.Rare Metals[J],2015,34(5):338
[15]Gao Peng,Yang Shaoqiang,Xue Zhu et al.Journal of Alloys and Compounds[J],2012,539:90
[16]Wang Yadong,Ai Xinping,Yang Hanxi.Chemistry of Materials[J],2004,16(24):5194
[17]Wang Qinghong,Jiao Lifang,Du Hongmei et al.International Journal of Hydrogen Energy[J],2010,35(15):8357
[18]Cao Yuliang,Zhou Wenchao,Li Xiaoyan et al.Electrochimica Acta[J],2006,51(20):4285
[19]Zhang Yunyun,Jiao Lifang,Yuan Huatang et al.Journal of Alloys and Compounds[J],2009,467(1-2):16
[20]Feng Yan,Jiao Lifang,Yuan Huatang et al.International Journal of Hydrogen Energy[J],2007,32(13):2325
[21]Feng Yan,Jiao Lifang,Yuan Huatang et al.International Journal of Hydrogen Energy[J],2007,32(14):2836
[22]Gao Zhijie,Luo Yongchun,Li Rongfeng et al.Journal of Power Sources[J],2013,241:509
[23]Fan Yanping,Peng Xianyun,Liu Baozhong et al.International Journal of Hydrogen Energy[J],2014,39(13):7042
[24]Dong Xiaoping,Yang Liying,Li Xiaoting et al.Journal of Rare Earths[J],2011,29(2):143
[25]Chu Hailiang,Qiu Shujun,Tian Qifeng et al.International Journal of Hydrogen Energy[J],2007,32(18):4925
[26]Zhang Yanghuan,Ren Huiping,Cai Ying et al.Transcation of Nonferrous Metal Society of China[J],2014,24(2):406
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