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通过NaBH_4还原CoSO_4溶液制备了Co_(0.68)B_(0.32),Co_(0.55)B_(0.45)和Co_(0.50)B_(0.50)一系列超细非晶态Co-B合金粉体.电化学测试表明,在300 mA/g的高电流密度下,3种合金电极的首次放电容量分别高达510.6,666.4和667.2 mA·h/g,经60次循环后,放电容量仍分别有331.6,379.5和390.5 mA·h/g.3种合金电极还表现出良好的高率放电性能,在1200 mA/g的放电电流密度下,放电容量分别为336.2,373.4和390.1 mA·h/g.较高的B含量有助于提高合金的电化学性能,这是因为B的氧化溶解能提高合金电极的实际电化学反应面积.
Co_ (0.68) B_ (0.32), Co_ (0.55) B_ (0.45) and Co_ (0.50) B_ (0.50) Co-B powders were prepared by NaBH_4 reduction of CoSO_4 solution.Electrochemical tests The results showed that the initial discharge capacities of the three alloy electrodes were 510.6, 666.4 and 667.2 mA · h / g, respectively, at a high current density of 300 mA / g. After 60 cycles, the discharge capacities of the three alloy electrodes were still 331.6, 379.5 and 390.5 mA · h / g.3 kinds of alloy electrode also showed good high rate discharge performance, discharge current density of 1200 mA / g, respectively, the discharge capacity of 336.2,373.4 and 390.1 mA · h / g higher B The content helps to improve the electrochemical performance of the alloy, because the oxidative dissolution of B can improve the actual electrochemical reaction area of the alloy electrode.