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Boosting the electrocatalytic activities of SnO2 electrodes for remediation of aqueous pollutants by doping with various metals
- Boosting the electrocatalytic activities of SnO2 electrodes for remediation of aqueous pollutants by doping with various metals
- Yang, So Young; Choo, Yeon Sik; Kim, Soonhyun; Lim, Sang Kyoo; Lee, Jaesang; Park, Hyunwoong
- DGIST Authors
- Kim, Soonhyun; Lim, Sang Kyoo
- Issue Date
- Applied Catalysis B: Environmental, 111, 317-325
- Article Type
- Antimony; Biodegradation; Catalyst Activity; Co-Dopants; Degradation; Degradation of Phenols; Degradation Rate; Direct Electron Transfer; Doping; Doping (Additives); Doping Levels; Electro-Chemical Electrodes; Electrocatalysis; Electrocatalysts; Electrocatalytic; Electrocatalytic Activity; Electrocatalytic Reactions; Electrochemical Properties; Electrode Surfaces; Free Radical Reactions; Free Radicals; Iron Compounds; N,N-Dimethyl-P-Nitrosoaniline; OH Radical; Optimal Combination; Optimization; Palladium Compounds; Phenols; Pollution; Probe Molecules; Reaction Intermediates; Reaction Mechanism; Sb-SnO2; Substrate Degradation; TOC Removal; Water Treatment; XRD
- The purpose of this study is to search for effective dopants and their optimal combinations to improve the electrocatalytic activity of the SnO 2 electrode for the remediation of aqueous pollutants. For this purpose, Sb was selected as the primary dopant for SnO 2 and six elements (Fe(III), Ni(II), Co(II), Ru(III), Ce(III), and Pd(II)) were also introduced into the optimized Sb-SnO 2 electrodes. The electrodes were checked for their electrochemical properties at different doping levels and tested for their electrocatalytic activities for the degradation of phenol and Eosin Y. In addition, RNO (N,N-dimethyl-p-nitrosoaniline) was used as a probe molecule for OH radicals to examine the reaction mechanism occurring at the electrodes. Sb with a 5-10at.% was most effective in making SnO 2 an electrocatalyst and Ni (∼1%) enhanced the degradation rate and TOC removal rate of phenol at the Sb-SnO 2 anode by a factor of 14 and 8, respectively. Fe also increased the activity moderately. Enhanced Ni-Sb-SnO 2 activity was also found for Eosin Y. The other co-dopants exhibited various degrees of positive or negative effects depending on the substrate. The lack of a correlation in the kinetics between substrate degradation and the RNO changes indicated that the primary electrocatalytic reactions may proceed via direct electron transfer and/or organic peroxy radical-mediation, not OH radical-mediation. Detailed analyses of the electrode surfaces (SEM, TEM, XRD, and XPS) and quantification of intermediates were carried out to obtain insight into the heterogeneous electrocatalytic reaction. © 2011 Elsevier B.V.
- Elsevier B.V.
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