Cobalt hydroxide, often used as an additive in nickel electrode, is rarely studied as active material for supercapacitors. In this paper, the Co(OH)2 with the particle size less than 20nm by deposition transformation ...Cobalt hydroxide, often used as an additive in nickel electrode, is rarely studied as active material for supercapacitors. In this paper, the Co(OH)2 with the particle size less than 20nm by deposition transformation was synthesized. Its single electrode specific capacitance was measured to be 92F·g-1, and the electrode resistance was so low that the initial potential drop when discharging is unobvious even the discharge current increased to 200mA for a 1cm2 electrode. After ten thousand cycles, Co(OH)2 on the electrode changes to Co3O4 gradually, the resistance of the electrode does not increase much, while the specific capacitance increases to 133F·g-1 at 10mA。展开更多
以Ag2O为前驱体,葡萄糖为还原剂,聚乙烯吡咯烷酮(PVP)等为分散剂,对沉淀转化法制备超细银粉进行了研究。试验考察了反应体系pH值、分散剂、葡萄糖浓度及反应温度对银粉形貌与粒度的影响。结果表明,随着pH值的增加,银粉粒径呈先减小后增...以Ag2O为前驱体,葡萄糖为还原剂,聚乙烯吡咯烷酮(PVP)等为分散剂,对沉淀转化法制备超细银粉进行了研究。试验考察了反应体系pH值、分散剂、葡萄糖浓度及反应温度对银粉形貌与粒度的影响。结果表明,随着pH值的增加,银粉粒径呈先减小后增大的趋势,偏酸性体系中银粉粒径分布较宽,而偏碱性体系中颗粒团聚明显且其粒径分布宽;以PVP为分散剂可制备出分散性良好的类球形超细银粉;提高葡萄糖浓度,银粉粒径减小;温度升高银粉粒径增大且团聚严重。在100mL高纯水中加入8 g Ag2O和0.08 g PVP,控制反应温度为30℃,接着并流加入0.35 mol/L葡萄糖溶液和0.18 mol/L氨水溶液,控制体系pH值为8的条件下,可制备出粒径在1μm左右且分散良好的类球形超细银粉,其粒度可调。展开更多
文摘Cobalt hydroxide, often used as an additive in nickel electrode, is rarely studied as active material for supercapacitors. In this paper, the Co(OH)2 with the particle size less than 20nm by deposition transformation was synthesized. Its single electrode specific capacitance was measured to be 92F·g-1, and the electrode resistance was so low that the initial potential drop when discharging is unobvious even the discharge current increased to 200mA for a 1cm2 electrode. After ten thousand cycles, Co(OH)2 on the electrode changes to Co3O4 gradually, the resistance of the electrode does not increase much, while the specific capacitance increases to 133F·g-1 at 10mA。
文摘以Ag2O为前驱体,葡萄糖为还原剂,聚乙烯吡咯烷酮(PVP)等为分散剂,对沉淀转化法制备超细银粉进行了研究。试验考察了反应体系pH值、分散剂、葡萄糖浓度及反应温度对银粉形貌与粒度的影响。结果表明,随着pH值的增加,银粉粒径呈先减小后增大的趋势,偏酸性体系中银粉粒径分布较宽,而偏碱性体系中颗粒团聚明显且其粒径分布宽;以PVP为分散剂可制备出分散性良好的类球形超细银粉;提高葡萄糖浓度,银粉粒径减小;温度升高银粉粒径增大且团聚严重。在100mL高纯水中加入8 g Ag2O和0.08 g PVP,控制反应温度为30℃,接着并流加入0.35 mol/L葡萄糖溶液和0.18 mol/L氨水溶液,控制体系pH值为8的条件下,可制备出粒径在1μm左右且分散良好的类球形超细银粉,其粒度可调。
