Semiconductor Nb-Doped SrTiO3−δ Perovskite Electrolyte for a Ceramic Fuel Cell
Source abstract
Abstract
A semiconductor-based electrolyte in a ceramic fuel cell (SCFC) has the potential to improve the device performance even at lower temperatures (≤520 °C) mainly due to its high ionic conductivity. Here, we present a chemically stable perovskite semiconductor Nb-doped SrTiO3−δ (STN) electrolyte for the SCFC, which reached a high power density of 678 mW/cm2 and a high open-circuit voltage (OCV) of 1.03 V at 520 °C. The STN showed a high ionic conductivity of 0.22 S/cm. Electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and band structure analysis revealed that the high ionic conductivity is due to an increase in oxygen vacancies and band gap modulation. It was also found that the bending of the energy band at the electrode/electrolyte interface helps to block the electrons and thus avoids the problem of short circuit. These results indicate that doping and energy band gap modulation can be effective approaches to develop advanced semiconductor electrolytes for SCFCs.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Engineering Research Center of Nano-Geo Materials of Ministry of Education, Department of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, Hubei 430062, China
Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage Joint Research Center, Southeast University School of Energy and Environment, Southeast University, No. 2 Si Pai Lou, Nanjing 210096, China
New Energy Technologies Group, Department of Applied Physics, Aalto University School of Science, P. O. Box 15100, Aalto, FI-00076 Espoo, Finland
Funding
Academy of Finland · National Natural Science Foundation of China · Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences
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