WEI Bingbo YANG Gencang ZHOU Yaohe Northwestern Polytechnical University
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Xi'an
,
China
金属学报(英文版)
Undercoolings up to 397 K(0.283 T_E)have been obtained for Ni-32.5% Sn eutectic alloy melted by superheating-cooling cycles and denucleating with inorganic glasses.The predomi- nant dissipation of heat for highly undercooled alloy melt is through radiation.An approxi- mate method is consequently derived to calculate its mean specific heat from measured cooling curves.With the aid of high speed cinematography,it is revealed that the surface or interface heterogeneous nucleation takes place in preference to homogeneous nucleation even though the undercooling has exceeded 0.2 T_E.
关键词:
undercooling
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伊昭宇
,
贺冲
,
朱君秋
,
邵艳群
,
唐电
中国有色金属学报
采用热分解法制备Ti/Ru0.4Mn(0.6-x)SnxO2(x=0,0.3,0.6)三元氧化物电极材料.通过扫描电子显微镜(SEM)、X射线衍射(XRD)、循环伏安(CV)、交流阻抗谱(EIS)和恒流充放电分析Ti/Ru0.4Sn(0.6-x)MnxO2电极材料的组织结构和电容性能.结果表明:三元氧化物电极中SnO2的加入能抑制RuO2表面析出,且有利于形成Ru-Mn-Sn-O固溶体氧化物;而MnO2的加入可以降低氧化钌的结晶度.三组元相互配合降低离子扩散阻力,提高活性材料的利用率,从而提高Ti/Ru0.4Mn(0.6-x)SnxO2电极材料的电荷存储能力.Ti/Ru0.4Mn0.3Sn0.3O2三元电极的比电容可达682 F/g,约为Ti/RuO2-SnO2和Ti/RuO2-MnO2二元氧化物电极的2～3倍.
关键词:
二氧化锰
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二氧化锡
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比电容
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交流阻抗
