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Influence of Cr doping on the oxygen evolution potential of SnO2/Ti and Sb-SnO2/Ti electrodes
Guangdong Res Inst Rare Met, Guangzhou 510651, Guangdong, Peoples R China.;Beihang Univ, Sch Phys & Nucl Energy Engn, 37 Xueyuan Rd, Beijing 100191, Peoples R China..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0001-5180-9895
Beihang Univ, Sch Phys & Nucl Energy Engn, 37 Xueyuan Rd, Beijing 100191, Peoples R China..
Guangdong Res Inst Rare Met, Guangzhou 510651, Guangdong, Peoples R China..
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2019 (English)In: JOURNAL OF ELECTROANALYTICAL CHEMISTRY, ISSN 1572-6657, Vol. 832, p. 436-443Article in journal (Refereed) Published
Abstract [en]

Oxygen evolution potential is the determining factor affecting the anode efficiency of the wastewater treatment process. In this study, we focus on increasing oxygen evolution potential of Cr-SnO2/Ti and Cr-Sb-SnO2/Ti electrodes with the pyrolytic method. XRD, SEM and XPS techniques had been applied to characterize the microstructures and chemical compositions of the samples. Electrochemical measurements had been performed to evaluate the oxygen evolution potential as a criterion of the wastewater treatment efficiency. The results show that co-doping of Sb and Cr improved the crystallinity and grain size of SnO2 coating, and Cr existed in the form of Cr(III) valence states. The Cr doping treatment improved the electronic conductivity and the electrocatalytic activity of the electrodes. DFT calculation of the band-structure indicates Cr doped SnO2 had a superior electrical conductivity, where Cr atom acts as an acceptor providing vacancies for electron transportation. The DOS diagrams reveal the Cr doped SnO2 showing a p-type conductivity which would subsequently influence the built-in potential on metal-semiconductor interface. We proposed the mechanism of the increase of oxygen evolution potential is the doping of Cr expands the built-in potential.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2019. Vol. 832, p. 436-443
Keywords [en]
Oxygen evolution potential, Cr doping, Wastewater treatment, DFT
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-244136DOI: 10.1016/j.jelechem.2018.11.058ISI: 000456759300054Scopus ID: 2-s2.0-85057783585OAI: oai:DiVA.org:kth-244136DiVA, id: diva2:1289502
Note

QC 20190218

Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-02-18Bibliographically approved

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