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In order to investigate the effect of different B-site additions on phase structure and electrochemical properties of cobalt-free La-Mg-Ni based alloys, La0.80Mg0.20Ni2.85Al0.11M0.53 (M=Ni, Si, Cr, Cu, Fe) hydrogen storage alloys were prepared and studied systemati-cally. X-ray powder diffraction showed that the alloys consisted mainly of LaNi3 phase and LaNi5 phase except that Cr addition caused a minor Cr phase. Electrochemical testing indicated that alloys with additional Ni, Cr, Cu or Fe were activated within only 1-2 cycles, while that with Si addition needed 4 cycles. Adding Si, Cu and Fe increased cycling stability of La-Mg-Ni based alloys. However, maximum discharge capacity decreased from 362 mAh/g to 215 mAh/g in the order of Ni>Fe>Cu>Cr>Si. In addition, electrochemical kinetics of alloy electrodes was also researched by measuring high rate discharge ability (HRD), hydrogen diffusion coefficient (D) and limiting current density (IL). 相似文献
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为了提高产品质量,扩大山梨醇的用途,使用SBH处理粗液体山梨醇,可以降低其残糖和总糖含量。SBH使用方法简单,操作方便。 相似文献
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本文在参阅国内外文献的基础上就多聚磷酸钠和三氯氧磷在改性淀粉中的应用作些介绍,重点介绍淀粉磷酸酯的制备、性质及其用途。 相似文献
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酒精副产物—杂醇油的开发利用 总被引:2,自引:0,他引:2
就发酵酒精副产物杂醇油的分离、精制出的各种醇类及酯化产品的制备和在工业上的应用作系统的介绍。 相似文献
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一、前言在生产聚醋酸乙烯乳液(以下简称,PVAC)过程中,多采用聚乙烯醇作保护胶体,水作分散介质。水的冰点是0℃,PVAC 乳液在冬季低温条件下贮存易冻结.如适当提高温度和加以搅拌,冻结的乳胶可消融,恢复其流动性,可继续使用。但消融后的乳胶,会影响以后乳液的贮存稳定性,轻则造成乳液表现粘度变大,重则造成乳液的凝聚。冻结之所以会影响乳液的稳定 相似文献
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1,3;2,4—二苄叉山梨醇的制备及应用 总被引:1,自引:0,他引:1
1,3;2,4—二苄叉山梨醇是用途广泛的精细化工产品。本文介绍了该产品的三种制备方法及其优缺点比较;详细叙述了其在塑料、油墨、涂料、粘合剂、日用化学品等方面的应用情况。 相似文献
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