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A highly stable microporous boron-doped diamond electrode etched by oxygen plasma for enhanced electrochemical ozone generation
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2021-09-15 , DOI: 10.1016/j.jece.2021.106369
Fangmu Liu 1 , Zejun Deng 2 , Dongtian Miao 1 , Weipeng Chen 1 , Yijia Wang 3 , Kechao Zhou 1 , Li Ma 1 , Qiuping Wei 1
Affiliation  

The boron-doped diamond (BDD) electrode, having ultra-high oxygen evolution potential and anodic stability, is potentially considered the ideal candidate for the next-generation ozone generator despite the relatively low current efficiency. In this work, we first report using a microporous BDD electrode etched by oxygen plasma, denoted as p-BDD, to improve the performance of electrochemical ozone generation. Two parameters, including O2 plasma etching temperature and time, are experimentally optimized. We demonstrated that the electrochemically active surface area (ECSA) of the optimal p-BDD is 2.51 times that of the bare BDD, and this p-BDD shows about one-quarter lower charge transfer resistance than the latter. Under the same unit energy consumption, the p-BDD has 3.76 times the ozone generation capacity compared to the latter. The p-BDD shows excellent long-term stability, only having 4.2% of the decrease in the current density up to 40 h of consecutive water electrolysis under the steady-state period, and it also remains a 100% recovery rate in its capability of electrochemical performance after mild treatment by cycling at a diluted sulfuric acid solution for 200 s



中文翻译:

氧等离子体蚀刻的高度稳定的微孔掺硼金刚石电极,用于增强电化学臭氧生成

尽管电流效率相对较低,但掺硼金刚石 (BDD) 电极具有超高的析氧电位和阳极稳定性,有可能被认为是下一代臭氧发生器的理想选择。在这项工作中,我们首先报告了使用由氧等离子体蚀刻的微孔 BDD 电极(表示为 p-BDD)来提高电化学臭氧生成的性能。两个参数,包括O 2等离子蚀刻温度和时间经过实验优化。我们证明了最佳 p-BDD 的电化学活性表面积 (ECSA) 是裸 BDD 的 2.51 倍,并且该 p-BDD 的电荷转移电阻比后者低约四分之一。在单位能耗相同的情况下,p-BDD的臭氧产生能力是后者的3.76倍。p-BDD 显示出优异的长期稳定性,在稳态期间连续电解 40 小时电流密度仅下降 4.2%,并且在其能力方面仍保持 100% 的回收率。通过在稀硫酸溶液中循环 200 秒进行温和处理后的电化学性能

更新日期:2021-09-22
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