A comparative study on layered cobalt hydroxides in water oxidation

作者：Leng Xue; Wu Kuang Hsu; Zeng Qingcong; Gentle Ian R; Wang Da Wei^*

来源：Asia-Pacific Journal of Chemical Engineering, 2016, 11(3): 415-423.

DOI：10.1002/apj.2005

• oxygen evolution reaction
• electrocatalysis
• metal hydroxide
• layered structures
• intercalate compounds

Oxygen evolution reaction has attracted extensive attention in energy conversion and storage technology (e.g. water splitting and rechargeable metal-air batteries). Its sluggish kinetics demands effective electrocatalysts to minimize the reaction barrier. Transition metal (oxy) hydroxides with a layered structure are one of the most active non-noble electrocatalysts. In this study, we compared the oxygen evolution performance of alpha-Co(OH)(2), beta-Co(OH)(2) and beta-CoOOH. Our results showed that alpha-type hydroxide is more active than beta-type with 60mV lower overpotential at 10mA/cm(2) and three times higher current density at 450mV overpotential. The plausible reason of this superior oxygen evolution activity is likely relevant to the large interlayer space in a-type hydroxide.

• 出版日期2016-6