Nanocrystalline Surface Layer of WO3 for Enhanced Proton Transport during Fuel Cell Operation
نویسندگان
چکیده
High ionic conductivity in low-cost semiconductor oxides is essential to develop electrochemical energy devices for practical applications. These materials exhibit fast protonic or oxygen-ion transport oxide by structural doping, but their application solid fuel cells (SOFCs) has remained a significant challenge. In this work, we have successfully synthesized nanostructured monoclinic WO3 through three steps: co-precipitation, hydrothermal, and dry freezing methods. The resulting exhibited good of 6.12 × 10?2 S cm?1 reached an excellent power density 418 mW cm?2 at 550 °C using as electrolyte SOFC. To achieve such high cell performance without any doping contents was surprising, there should not be possibility oxygen vacancies the bulk structure transport. Therefore, laterally found that surface layer reduced oxygen-deficient when exposed reducing atmosphere form WO3??/WO3 heterostructure, which reveals unique mechanism. Different microscopic spectroscopic methods HR-TEM, SEM, EIS, Raman, UV-visible, XPS, ESR spectroscopy were applied investigate structural, morphological, properties electrolyte. stability explained less dispersion between valence conduction bands WO3??/WO3, turn could prevent current leakage reach performance. This work provides some new insights designing high-ion conducting storage conversion devices.
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ژورنال
عنوان ژورنال: Crystals
سال: 2021
ISSN: ['2073-4352']
DOI: https://doi.org/10.3390/cryst11121595