Abstract
Solid oxide fuel cells (SOFCs) are facing a bottleneck issue caused by their high operating temperatures that confines their widespread application, which is mainly due to the low ionic conductivity of the electrolyte. If the ionic transport in the electrolyte could be improved to reduce the operating temperatures of SOFCs, their application scenarios could be extended to more industrial activities, such as providing continuous power to Internet of Things (IoT) devices. In this work, as a proof of concept, a new nanocomposite electrolyte NBZY is proposed based on proton conductor BaZr0.8Y0.2O3−δ and Na2CO3 for developing low-temperature SOFCs to power IoT sensors. Material characterization reveals the prepared BaZr0.8Y0.2O3−δ–Na2CO3 (NBZY) forms a heterostructure, with a thin layer of amorphous Na2CO3 coating on the surface of BZY particles, which could create effective pathways to enable high proton conductivity in NBZY. The fabricated NBZY-based SOFCs exhibit high peak power densities of 245–943 mW/cm2 and high open circuit voltages (OCVs) of 1.09 ~ 1.22 V at 400–500 °C due to the high proton conduction and good gas-tightness of NBZY. Durability tests demonstrate that the cells have good operation repeatability and can be stably operated for up to 90 h. Using a power management unit (PMU), the developed SOFC can be used to charge the supercapacitor within 35 min and successfully power the IoT sensor to measure the ambient temperature. This study develops a new high-performance composite electrolyte for low-temperature SOFCs and for the first time indicates the feasibility of SOFC for powering IoT systems.
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The data that support the findings of this study are available from the corresponding author, upon reasonable request.
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Funding
The Science and Technology Project of State Grid Inner Mongolia Eastern Power Co., LTD. Grant no. SGMDHBOOYJJSJ100S90, Tianlong Bu.
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HK and TB conceived and designed the experiments; HK, TB, DN and HH performed the experiments; HK, TB, DN. and HH analyzed the data; HK and TB contributed the used materials and analysis tools; HK, TB and KW wrote the paper. All authors have read and agreed to the published version of the manuscript. All authors have read and agreed to the published version of the manuscript.
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Kou, H., Bu, T., Nie, D. et al. High-performance LT-SOFCs based on BaZr0.8Y0.2O3−δ–Na2CO3 nanocomposite electrolyte for powering IoT system. J Mater Sci: Mater Electron 35, 426 (2024). https://doi.org/10.1007/s10854-024-12152-z
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DOI: https://doi.org/10.1007/s10854-024-12152-z