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Boosting the electrocatalytic activities of SnO2 electrodes for remediation of aqueous pollutants by doping with various metals

Title
Boosting the electrocatalytic activities of SnO2 electrodes for remediation of aqueous pollutants by doping with various metals
Authors
Yang, So YoungChoo, Yeon SikKim, SoonhyunLim, Sang KyooLee, JaesangPark, Hyunwoong
DGIST Authors
Kim, SoonhyunLim, Sang Kyoo
Issue Date
2012-01-12
Citation
Applied Catalysis B: Environmental, 111, 317-325
Type
Article
Article Type
Article
Keywords
AntimonyBiodegradationCatalyst ActivityCo-DopantsDegradationDegradation of PhenolsDegradation RateDirect Electron TransferDopingDoping (Additives)Doping LevelsElectro-Chemical ElectrodesElectrocatalysisElectrocatalystsElectrocatalyticElectrocatalytic ActivityElectrocatalytic ReactionsElectrochemical PropertiesElectrode SurfacesFree Radical ReactionsFree RadicalsIron CompoundsN,N-Dimethyl-P-NitrosoanilineOH RadicalOptimal CombinationOptimizationPalladium CompoundsPhenolsPollutionProbe MoleculesReaction IntermediatesReaction MechanismSb-SnO2Substrate DegradationTOC RemovalWater TreatmentXRD
ISSN
0926-3373
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/5368
DOI
10.1016/j.apcatb.2011.10.014
Publisher
Elsevier B.V.
Related Researcher
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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