Ternary Co-Ni-B amorphous alloy with a superior electrochemical performance in a wide temperature range
Ternary Co-Ni-B amorphous alloy with a superior electrochemical performance in a wide temperature range
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三元Co-Ni-B非晶合金在宽温度范围内具有优异的电化学性能
DOI：
10.1016/j.ijhydene.2016.01.020
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发表时间：
2016-02-19
影响因子：
7.2
通讯作者：
Zhou, Huaiying
中科院分区：
文献类型：
--
作者：
Qiu, Shujun;Huang, Jianling;Zhou, Huaiying
采用化学还原法制备了Co-Ni-B三元非晶态合金。该合金用作碱性二次电池的负极，在-30~50℃的温度范围内表现出良好的电化学性能，特别是在-15℃、0℃和25℃下，100次循环后的放电容量分别保持在395.2、403.7和379.1毫安时/克。即使在-30摄氏度的低得多的温度下，最大放电容量仍保持在408.3毫安/克，并在100次循环后缓慢衰减至317.1毫安/克。当温度升高到50℃时，Co-Ni-B合金电极的放电容量从675.6 mAh/g下降到283.1 mAh/g。在相同温度下，这些性能明显优于传统的储氢合金电极。循环伏安(CV)、交流阻抗谱(EIS)和阳极极化(AP)测试表明，温度对Co-Ni-B合金电极的电化学动力学有重要影响。版权所有(C)2016，氢能源出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
Ternary Co-Ni-B amorphous alloy was synthesized by a chemical reduction method. Used as a negative electrode in the alkaline rechargeable batteries, the as-prepared alloy exhibits an excellent electrochemical performance in the temperature range of -30 to 50 degrees C. Specifically, the discharge capacity after 100 cycles still keeps up at 395.2, 403.7, and 379.1 mAh/g at -15, 0 and 25 degrees C, respectively. Even at a much lower temperature of -30 degrees C, the maximum discharge capacity remains to be 408.3 mAh/g and slowly decays to 317.1 mAh/g after 100 cycles. Moreover, the high-rate dischargeability at 900 mA/g is 29.6% at -30 degrees C. When the temperature increases to 50 degrees C, the discharge capacity of the Co-Ni-B alloy electrode decreases from 675.6 to 283.1 mAh/g after 100 cycles. These properties are very superior to those of conventional hydrogen storage alloy electrodes at the corresponding temperatures. The cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and anodic polarization (AP) tests show that the temperature has a crucial effect on the electrochemical kinetics of the Co-Ni-B alloy electrode. Copyright (C) 2016, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.