摘要
本文采用电镀的方法制得了一种低氢超电压的 Ni-Co-W 合金阴极.在25℃和12%NaOH 水溶液中,其析氢反应超电压在电流密度250mA/cm^2时约为200mV.其析氢反应的交换电流密度为8.6×10^(-1)mA/cm^2.它比铁电极、镍钨电极优越.Ni-Co-W 阴极中,镍为主要成份.镍和钴以纯金属状态存在.钨以金属钨和兰钨形式存在.用所制得的阴极在大电流密度下进行电解.其析氢过电位长时间保持稳定,并且实验前后形貌基本上不变.与镍钨电极比较,Ni-Co-W 活性层与基体结合较牢.应有较长的使用寿命.
Ni-Co-W alloy cathode with low hydrogen overpotential was prepared by plating.When used as a cathode in electrolysis in aqueous solution of 12% NaOH at 25℃,the hydrogen evolution overpotential was about 200mV at cathodic current density of 250mA/cm^2. The exchange current density was about 8.6×10^(-1)mA/cm^2.The cathode was found to be supperior to Fe electrodes and Fe-supported Ni-W electrodes. Nickel was the chief component of the Ni-Co-W cathode.The nickel and cobalt in Ni-Co-W alloy were in metallic state.Tungsten is present in both metallic tungsten and.blue tungsten. This electrode was tested as a cathode in 12% NaOH solution at 25℃ with 1A/cm^2 current density applied for 7 days and no change of the appearance of the electrode surface was found. As compared with the Fe supported Ni-W cathode,the active layer of the Ni-Co-W was more firmly adhered to the Fe base and the new electrode was expected to have long service life.
出处
《化工冶金》
CSCD
北大核心
1992年第2期118-125,共8页
基金
国家自然科学基金
关键词
活性阴极
镍钴钨合金
Nickel Cobalt Tungsten Cathode
