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Effects of electrolyte on the electrocatalytic activities of RuO2/Ti and Sb-SnO2/Ti anodes for water treatment

Title
Effects of electrolyte on the electrocatalytic activities of RuO2/Ti and Sb-SnO2/Ti anodes for water treatment
Authors
Kim, SoonhyunChoi, Sung KyuYoon, Bok YoungLim, Sang KyooPark, Hyunwoong
DGIST Authors
Kim, SoonhyunLim, Sang Kyoo
Issue Date
2010-06-09
Citation
Applied Catalysis B: Environmental, 97(1-2), 135-141
Type
Article
Article Type
Article
Keywords
4-Chlorophenol (4-Cp)Acid Orange 7Active ChlorineAnodesChlorineComplete OxidationDegradationDegradation RateElectrocatalytic ActivityElectrochemical ExperimentsElectrochemical SensorsElectrolytesHigh EfficiencyIndirect ReactionsMethylene BlueModel SubstratesNa2SO4NaClOxidationPotential RangeRuO2/TiRuthenium AlloysRuthenium CompoundsSb-SnO2/TiSodiumSodium ChlorideStainless SteelStainless Steel CathodesSubstrate OxidationSubstratesSupporting ElectrolyteSurface AnalysisSurface ReactionsSustainable Water SupplyThree ModelsTi ElectrodeWater ConservationWater RecyclingWater SupplyWater TreatmentWater Treatment Systems
ISSN
0926-3373
Abstract
The study of high efficiency electrochemical water treatment systems is of great importance in contributing to a sustainable water supply. In this study, we prepared RuO2/Ti and Sb-SnO2/Ti electrodes and investigated their electrocatalytic activities for the oxidation of water and three model substrates (methylene blue, acid orange 7, and 4-chlorophenol) in two supporting electrolytes: NaCl vs. Na2SO4. Irrespective of the electrolyte, the particulate RuO2/Ti anode was found to oxidize water at ca. 0.8 V lower potential ranges with significantly higher currents than the cracked-mud type of Sb-SnO2/Ti, indicating that the latter is more suitable for substrate oxidation. In the system of Sb-SnO2/Ti anode-stainless steel cathode couple, the degradation rates of all the substrates were highly enhanced in NaCl, whereas their complete oxidation (i.e., CO2 evolution) occurred more markedly in Na2SO4. Additional detailed experimental results indicated that the relative superiority of Sb-SnO2/Ti over RuO2/Ti for treating the model substrates depended greatly on the employed supporting electrolytes, and that the superiority particularly vanished when NaCl was used as the electrolyte. Using this electrolyte, active chlorine species-mediated indirect reactions seemed to occur at both anodes, while in the Na2SO4 electrolyte, the surface-specific reaction occurred. Finally, surface analysis and diverse electrochemical experiments were performed to compare both anodes in a more quantitative way and to investigate the effect of the electrolytes on the electrocatalytic activities of the anodes. © 2010 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/5408
DOI
10.1016/j.apcatb.2010.03.033
Publisher
Elsevier B.V.
Related Researcher
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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