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Performance of spray deposited Gd-doped barium cerate thin films for proton conducting SOFCs
Affiliation:1. Department of Physics, Shivaji University, Kolhapur, 416004, India;2. Department of Physics, Rajaram College, Kolhapur, 416004, India;1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China;2. State Key Lab for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, PR China;1. Departament de Física Aplicada i Òptica, Universitat de Barcelona, Barcelona, Spain;2. Departament d’Electrònica, Universitat de Barcelona, Barcelona, Spain;3. Ruđer Bošković Institute, Bijenička 54, Zagreb 1000, Croatia;4. NanoBioMedical Centre AMU, Umultowska 85, 61-614 Poznan, Poland;5. Institut de Ciència de Materials de Barcelona, CSIC, Campus de la UAB, Barcelona, Spain;1. Laboratory of Electrochemical Devices based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, 620990 Yekaterinburg, Russia;2. Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 383 34 Volos, Greece;1. Department of Energy Technology, Royal Institute of Technology (KTH), S-10044 Stockholm, Sweden;2. Department of Applied Physics, Aalto University, Aalto, FI-00076 Espoo, Finland;3. Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden;4. Division of Functional Materials, Royal Institute of Technology (KTH), S-16440 Stockholm, Sweden;5. Solar Energy Research Center, School of Energy and Environment, Southeast University, Nanjing 210096, PR China;6. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei University, Wuhan 430062, PR China
Abstract:Doped barium cerate is a promising solid electrolyte for intermediate temperature fuel cells as a protonic conductor. In the present paper, the nanocrystalline Gd-doped barium cerate (BaCe0.7Gd0.1Y0.2O2.9) thin films have been successfully deposited on alumina substrate by spray pyrolysis technique. The films deposited from 0.1 M concentration and annealed at five different temperatures were characterized with different physio-chemical techniques. The BCGY is crystallized in orthorhombic perovskite structure with slight shift to the lower 2θ value compared with barium cerate (BC) and yttrium doped barium cerate (BCY). The grain growth and hence densification is also investigated by using SEM and AFM. The grain growth is almost complete at 1000 °C and the surface of the film appears to be smooth with typical roughness of 152 nm. Raman spectrum of BCGY film shows intense band at 463.8 cm−1 compared to pure BC and BCY indicating the presence of more oxygen vacancies due to Gd doping. The proton conductivity of BCGY thin film in moist atmosphere is 1×10−3 Scm−1.
Keywords:Spray pyrolysis technique  Solid oxide fuel cell  X-ray diffraction  Scanning electron microscope
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