The Oxygen evolution reaction on cobalt borides and composite cobalt borides was investigated in a 6M KOH solution (1 M=1 mol dm−3) using the factor of the magnetic properties. In the system of cobalt borides (Co:B=3:1) prepared at various sintering temperatures, the boride having a higher saturation magnetization revealed a higher activity of the oxygen evolution reaction. In the system of composite cobalt borides which have various magnetic moments, μB, a clear correlation between the activity of the oxygen evolution reaction and the saturation magnetization (or magnetic moment, μB) was observed for several composite cobalt boride species (i.e., Co–Fe–B, Co–Ni–B, Co–Mn–B, and Co–B). Among the composite cobalt boride species, the cobalt iron boride (Co:Fe:B=1:2:1) sintered at 450 °C showed the highest activity of oxygen evolution reaction in a 6 M KOH solution. The conditions of oxide formation on Co–Fe–B(1:2:1) and on Co–B(3:1) in a 6 M KOH solution were compared with those on cobalt by means of voltammetry and chronopotentiometry. It was concluded that the ease and stability of oxide films in higher oxidation states are strongly correlated to the activity of the oxygen evolution reaction which occurs on more highly oxidized oxide films.
在6M KOH溶液(1 M=1 mol dm−3)中,利用磁性质因子研究了
钴硼化物和复合
钴硼化物中的氧析出反应。在各种烧结温度下制备的
钴硼化物(Co:B=3:1)体系中,具有更高饱和磁化的
硼化物显示出更高的氧析出反应活性。在具有不同磁矩μB的复合
钴硼化物体系中,观察到几种复合
钴硼化物(即Co–Fe–B、Co–Ni–B、Co–Mn–B和Co–B)的氧析出反应活性与饱和磁化强度(或磁矩μB)之间存在明显的相关性。在复合
钴硼化物中,在450 °C下烧结的
钴铁硼化物(Co:Fe:B=1:2:1)在6 M KOH溶液中显示出最高的氧析出反应活性。通过伏安法和恒电位法,将6 M KOH溶液中Co–Fe–B(1:2:1)和Co–B(3:1)的氧化物形成条件与
钴的氧化物形成条件进行了比较。结果表明,高氧化态下氧化物膜的易形成性和稳定性与氧析出反应