材料科学
电化学
热分解
阳极
电极
热液循环
化学工程
无机化学
化学
有机化学
物理化学
工程类
作者
Shuaishuai Man,Xuzhong Zeng,Zhan Yin,Haifeng Yang,Hebin Bao,Ke Xu,Li Wang,Xiaotian Ge,Zhihong Mo,Wenjing Yang,Xueming Li
标识
DOI:10.1016/j.electacta.2022.140066
摘要
Nanostructured Sb-SnO2 electrodes with high electrochemical activity and stability are urgently desired for electrochemical oxidation of refractory organics in wastewater treatment, yet hard to be controlled and synthesized. Hence, we combined the hydrothermal method and thermal decomposition technologies to prepare a novel Ce and Sb co-doped SnO2 nanoflowers electrode (Ti/Ce-Sb-SnO2NFs). The incorporation of Ce endowed the Ti/Ce-Sb-SnO2NFs anode with an increased oxygen evolution over-potential (OEP) (1.99 V vs.SCE), lower charge transfer resistance (7.54 Ω⋅cm2), large specific electrochemical active surface area (141.83), a great number of active sites and superior •OH generation ability. Consequently, nearly 100% decolorization efficiency and 91.45% chemical oxygen demand (COD) mineralization efficiency of methylene blue (MB) (20 mg/L) were achieved by the Ti/Ce-Sb-SnO2NFs anode within 90 min. Additionally, the Ti/Ce-Sb-SnO2NFs anode stability was also improved with a longer accelerated lifetime (15.5 h) than the given Ti/Sb-SnO2NFs electrode (8.2 h). We also prepared other nanostructured (nanoparticles, nanoclusters and nanosheets) Sb-SnO2 electrodes with high oxidation capacity utilizing this two-step method, which demonstrated its great versatility. Accordingly, this work could provide a new strategy for fabricating efficient and stable rare earth elements (Ce, Nd, La, etc.) and Sb co-doped SnO2 nanostructured electrodes for decomposition organic pollutants in the field of wastewater treatment.
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