煅烧
炭黑
催化作用
材料科学
氧气
电化学
电催化剂
降级(电信)
罗丹明B
矿化(土壤科学)
核化学
化学工程
无机化学
光催化
化学
电极
有机化学
氮气
工程类
物理化学
复合材料
电信
天然橡胶
计算机科学
作者
Haichuan Zhang,Yingjie Li,Yingshuang Zhao,Guanghe Li,Fang Zhang
标识
DOI:10.1021/acsami.9b07765
摘要
Carbon black (CB) has a high conductivity and a large surface area, which are the basis of an excellent electrocatalyst. However, CB itself is usually less active or even inactive toward two-electron oxygen reduction reaction (2e- ORR) due to the absence of highly active functional groups with low oxygen content. To activate commercial CB for 2e- ORR, oxygen-containing functional groups were introduced onto the CB surface by a simple air calcination method. After the oxidation treatment at 600 °C (CB600), the oxygen content increased from the initial 1.17 ± 0.15 to 4.08 ± 0.60%, leading to a dramatic increase of the cathodic current from only -8.1 mA (CB) to -117.6 mA (CB600). The air cathode made of CB600 achieved the maximum H2O2 production of 517.7 ± 2.4 mg L-1 within 30 min, resulting in the removal of ∼91.1% rhodamine B in 2 min and an effective mineralization of ∼76.3% in an electro-Fenton reactor. This performance was much better than that obtained using the CB catalyst (65.3 ± 5.6 mg L-1 H2O2 production, and ∼20.3% mineralization). This excellent activity of CB600 toward 2e- ORR was greatly improved by the introduction of O═C-OH and C-O-C groups. The successful improvement of the 2e- ORR activity of CB using air calcination enables its practical application in electrochemical advanced oxidation processes.
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