微型多孔材料
电解
氧气
选择性
传质
化学
活性炭
电极
钛
化学工程
阴极
碳纤维
气体扩散电极
氧化还原
无机化学
材料科学
催化作用
复合材料
电化学
复合数
色谱法
有机化学
物理化学
电解质
吸附
工程类
作者
Fengxia Deng,Shilin Yang,Baojian Jing,Shan Qiu
出处
期刊:Chemosphere
[Elsevier]
日期:2023-04-01
卷期号:321: 138147-138147
标识
DOI:10.1016/j.chemosphere.2023.138147
摘要
In the electro-Fenton process, there still suffers concern of low H2O2 generation caused by inadequate mass transfer of oxygen and low selectivity of oxygen reduction reaction (ORR). To solve it, in this study, various particle sizes (850 μm, 150 μm, and 75 μm) of granular activated carbon filled in a microporous titanium-foam substate was used to develop a gas diffusion electrode (AC@Ti–F GDE). This facile-prepared cathode has seen a 176.15% improvement in H2O2 formation compared to the conventional one. Aside from a much higher oxygen mass transfer by creating gas-liquid-solid three-phase interfaces coupled with much high dissolved oxygen, the filled AC played a significant role in H2O2 accumulation. Among these particle sizes of AC, the one in 850 μm has observed the highest H2O2 accumulation, reaching 1487 μM in 2 h electrolysis. Because there is a balance between chemical nature for H2O2 formation and micropore-dominant porous structure for H2O2 decomposition, resulting in an electron transfer of 2.12 and H2O2 selectivity of 96.79% during ORR. In a word, the facial AC@Ti–F GDE configuration is promising for H2O2 accumulation.
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