Characterization of Cu1.4Mn1.6O4/PPy composite electrodes |
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| Institution: | 1. Instituto de Química-Física “Rocasolano”, CSIC, c/ Serrano, 119, 28006 Madrid, Spain;2. Institut de Chimie, LC3-UMR 7177-CNRS/ULP, Laboratoire d''Electrochimie et de Chimie Physique du Corps Solide, rue Blaise Pascal, 67000 Strasbourg, France;3. Departamento de Química de los Materiales, Facultad de Química y Biología, USACH, Avda. Libertador O''Higgins 3363, Santiago, Chile;1. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry (USTHB), BP 32, Algiers, 16111 Algeria;2. Centre Inter-Universitaire de Recherche et d′Ingénierie des Matériaux (CIRIMAT)-UMR CNRS 5085, Toulouse III, 118 Route de Narbonne, Toulouse Cedex 09, 31062 France;1. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences(CAS), Shandong Provincial Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai Shandong, 264003, China;2. Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China;3. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Department of Functional Materials, School of Materials Sciences and Technology, Guangdong University of Petrochemical Technology, Maoming 525000, China;2. Institute of Materials Science and Devices, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;3. School of Chemistry, Guangdong University of Petrochemical Technology, Maoming 525000, China |
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| Abstract: | In this work, we have studied the multilayered polypyrrole(PPy)/oxide composite electrode on glassy carbon (GC) having the structure GC/PPy/PPy(Cu1.4Mn1.6O4)/PPy using X-ray Photoelectron Spectroscopy and Mn K-edge and Cu K-edge XANES and EXAFS. The mixed oxide particles have been incorporated into the PPy matrix simultaneously to the electropolymerization of Py from a solution containing 0.1 M Py + 0.15 M KCl + Cu1.4Mn1.6O4. The XPS data have shown that, prior to the incorporation of the oxide into the PPy matrix, it contains Cu+, Cu2+, Mn3+ and Mn4+. The XPS, XANES and EXAFS results have shown that when the oxide is incorporated into the PPy matrix, the Cu+ present in the original oxide suffers dismutation to give Cu2+ and metallic Cu. The metallic Cu is segregated out of the spinel structure. The Mn K-edge XANES and EXAFS data show that, after the incorporation into the PPy matrix, Mn is present as Mn3+ and Mn4+ occupying octahedral sites in a spinel-related structure while the Cu K-edge XANES and EXAFS data indicate that copper occupies tetrahedral sites predominantly in that structure but having a large degree of disorder in the second and higher coordination shells. |
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