Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 1, Pages 587-597Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01617
Keywords
protonic ceramic fuel cell (PCFC); open-circuit voltage (OCV); electrode polarization; electrode/electrolyte interface; barium zirconate-cerate
Funding
- Advanced Research Program for Energy and Environmental Technologies of the New Energy and Industrial Technology Development Organization (NEDO)
- Japan Society for the Promotion of Science (JSPS KAKENHI) [JP15K18239]
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Although protonic ceramic fuel cells (PCFCs) have a great potential to realize higher energy-conversion efficiency compared with all other conventional devices, actual PCFCs have shown current leakage loss due to their intrinsic transport property with electron-hole conduction of proton-conducting electrolytes, resulting in a decrease in efficiency. The present study shows a new finding that open-circuit voltage (OCV), which is an indicator of current leakage loss, depends on the ratio of the electrode polarization resistance to the electrolyte ohmic resistance within a PCFC and experimentally demonstrates improvement in OCV by developing high-performance cathode and anode. Results show that our anode supported PCFC with BaZr0.1Ce0.7Y0.1Th0.1O3-delta electrolyte and high-performance electrodes achieves extremely high OCV, e.g., 1.112 V at 600 degrees C (approximate to 98% of the theoretical OCV) and 1.132 V at 550 degrees C (approximate to 99% of the theoretical OCV). Compared with recently reported OCVs for PCFCs, these measured OCVs are remarkably high. These results indicate that high-performance electrodes lead to suppression of current leakage loss in PCFCs and thus enable PCFCs to operate with higher energy conversion efficiency.
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