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Electrocatalytic activities of Sb-SnO2 and Bi-TiO2 anodes for water treatment: Effects of electrocatalyst composition and electrolyte

Title
Electrocatalytic activities of Sb-SnO2 and Bi-TiO2 anodes for water treatment: Effects of electrocatalyst composition and electrolyte
Authors
Ahn, YY[Ahn, Yong Yoon]Yang, SY[Yang, So Young]Choi, C[Choi, Chimyung]Choi, W[Choi, Wonyong]Kim, S[Kim, Soonhyun]Park, H[Park, Hyunwoong]
DGIST Authors
Kim, S[Kim, Soonhyun]
Issue Date
2017-03-15
Citation
Catalysis Today, 282, 57-64
Type
Article
Article Type
Article; Proceedings Paper
Keywords
AnodesCarbon DioxideCatalysisCatalyst ActivityChemicals Removal (Water Treatment)Chloride ElectrolytesChlorineChlorine CompoundsCrystalline PhasisElectrocatalystsElectrocatalytic ActivityElectrocatalytic BehaviorElectrodesElectrolytesFabrication ProcedureFree RadicalsInorganic CompoundsMetal OxidesPerchlorate ElectrolytesPhenolsReaction IntermediatesReactive SpeciesTitanium DioxideWater Treatment
ISSN
0920-5861
Abstract
This study compares the electrocatalytic behavior and performance of metal-doped oxide anodes in widely employed electrolytes (i.e., Na2SO4, NaClO4, and NaCl). Sb-doped SnO2 (Sb-SnO2), Bi-doped SnO2 (Bi-SnO2), or Bi-doped TiO2 (Bi-TiO2) are coated onto a Ta-doped IrO2 (Ta-IrO2) electrode using identical fabrication procedures involving coating and annealing cycles. The resultant electrodes display porous morphologies with interparticle connections. Crystalline phases of Sb-associated oxides are not evident in Sb-SnO2, whereas distinct Bi2O3 phases are observed in Bi-SnO2 and Bi-TiO2 because the radius of Bi3+ is larger than those of the base metals. Sb-SnO2 exhibits the highest electrocatalytic activity for the decomposition of phenol irrespective of the type of electrolyte, whereas the activity of Bi-SnO2 is always poor. The activity of Bi-TiO2 is poor in sulfate and perchlorate electrolytes; in contrast, it is remarkably enhanced and comparable to that of Sb-SnO2 in chloride electrolyte. Such chloride-specific activity of Bi-TiO2 is attributed to the effective generation of reactive chlorine species, whereas the generation of OH radicals is limited. On the other hand, Sb-SnO2 effectively catalyzes the generation of OH radicals, leading to mediated generation of reactive chlorine species. The decomposition of phenol is further examined in terms of reaction intermediates and CO2 production using Sb-SnO2 and Bi-TiO2 anodes in sulfate and chloride electrolytes. The electrocatalyst and electrolyte-dependent mechanism is discussed. © 2016 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/2038
DOI
10.1016/j.cattod.2016.03.011
Publisher
Elsevier B.V.
Related Researcher
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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