N-doping SrTiO3@SrCO3 heterostructure electrode: Synthesis,electrochemical characterization,and varistor application |
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| Affiliation: | 1. Materials Engineering Department, Federal University of São Carlos, São Carlos, SP, Rodovia Washington Luís, Km 235, s/n - Jardim Guanabara, São Carlos , SP CEP: 13565-905, Brazil;2. São Paulo State University (Unesp), Institute of Chemistry, Araraquara, Rua Prof. Francisco Degni, 55, Quitandinha, Araraquara, SP CEP: 14800-06, Brazil;3. Embrapa Instrumentação, São Carlos, SP, Rua XV de Novembro, 1452, São Carlos, SP CEP: 13560-970, Brazil;4. Chemistry Department, Federal University of São Carlos, São Carlos, SP, Rodovia Washington Luís, Km 235, s/n - Jardim Guanabara, São Carlos, SP CEP: 13565-90, Brazil;1. Department of Natural and Mathematic Sciences, Turin Polytechnic University in Tashkent, Malaya Kolsevaya 17, Tashkent, 100095, Uzbekistan;2. Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt, Jovanka-Bontschits-str. 2, Darmstadt, 64287, Germany;1. INCTMN, LIEC, Chemistry Department, Federal University of São Carlos, P.O. Box 676, 13565-905 São Carlos, SP, Brazil;2. Instituto de Ciência e Engenharia do Mar-Federal University of São Paulo-UNIFESP/Campus Baixada Santista, Av. Alm. Saldanha da Gama, 89 – Ponta da Praia, Santos, SP CEP: 11030-400, Brazil;3. UNIFESP, Federal University of São Paulo, Rua Prof. Artur Riedel, 275, SP, 09972-270 Diadema, SP, Brazil;4. INCTMN, LIEC, Chemistry Institute, State University of São Paulo, UNESP, P.O. Box 355, 14800-900 Araraquara, SP, Brazil;1. Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea;2. School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-713, Republic of Korea;1. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan;2. Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan;1. Department of Environmental Engineering, National Chung Hsing University, Taichung 402, Taiwan, ROC;2. Taiwan Research Institute, Taipei 251, Taiwan, ROC |
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| Abstract: | Optical traditional techniques, such as diffusive reflectance spectroscopy, are used to confirm absorption behavior modification after anion doping process. However, the doping process in some materials as a SrTiO3 semiconductor was not clearly proved in different anions doping cases through traditional techniques. In this case, supporting technique as electrochemical measurements could prove a great help in elucidating the doping process modifications in the semiconductor material. In this paper, the electrochemical characterization was applied to analyze changes in energy bands produced by N-doping in SrTiO3@SrCO3 composite thin film electrodes. SrTiO3@SrCO3 and N-doped SrTiO3@SrCO3 nanoparticles were first characterized by X-ray diffraction to confirm a perovskite crystalline structure in both materials, whereas diffusive reflectance spectroscopy was used to demonstrate that no modification in the absorption spectrum is evident after doping. The thin films were observed by FESEM/SEM, and its deposition parameters were electrochemically evaluated. The electrochemical profiles of SrTiO3@SrCO3 and N doped SrTiO3@SrCO3 thin film electrodes were compared in dark and under UV-C light to determine the photocurrent. These measurements presented distinct results for the undoped and the doped materials, such as modification in photocurrent under UV-C illumination. SrTiO3@SrCO3 composite electrodes show important characteristics which could be classified as a potential candidate in varistor uses, especially in the low-voltage protection system. The presented results confirm that electrochemical methods are useful to analyze the synthesis efficiency to produce N-doped structures. |
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| Keywords: | Composite electrodes Photoelectrodes Characterization Photocatalyst Doping process |
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