双功能
析氧
氧气
电池(电)
碳纤维
电导率
锌
氧化物
催化作用
电极
化学
化学工程
复合数
材料科学
氧化还原
无机化学
作者
Wen-Yang Jao,Yi-Ting Lu,Chi-Yu Lai,Chi-Chang Hu
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2022-01-31
标识
DOI:10.1149/1945-7111/ac5062
摘要
Abstract The oxygen reduction reaction and oxygen evolution reaction (OER) are vital to the operation of rechargeable zinc-air batteries. This work demonstrates that both the intrinsic activity and the electrochemically active surface area (ECSA) of the oxide-carbon composites are key factors determining the overall catalytic activity. Here, we revisit the possible use of mesocarbon microbeads (MCMBs) as a support to improve the bifunctional activity of NiCo 2 O 4 (NCO). Pre-treatments including oxidation and expansion of MCMB have been applied to obtain two types of modified MCMBs. The abundant functional groups on the oxidized MCMB (OMCMB) provide strong interaction between oxide and carbon, although a relatively low electrical conductivity is obtained. Compared to OMCMB, the expanded MCMB with less functional groups shows a much larger surface area and presumably higher conductivity. The three-electrode tests reveal that the composite supported by OMCMB-3h (i.e., 3-h oxidation treatment) has a moderate intrinsic activity of the OER and the highest ECSA, leading to the enhanced bifunctional activities. The charge-discharge test of a rechargeable zinc-air battery at various current densities shows the cycling stability of NCO/OMCMB-3h at 150 mA cm -2 , which also can be cycled at 15 mA cm -2 for 60 h without obvious decay.
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