Stability considerations of semiconductor ionic fuel cells from a LNCA (LiNi0.8Co0.15Al0.05O2-δ) and Sm-doped ceria (SDC; Ce0.8Sm0.2O2-δ) composite electrolyte |
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Authors: | Fan Yang Yuzheng Lu Junjiao Li Xiang Song Lei Yu Yixiao Cai |
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Affiliation: | 1. Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology, School of Energy and Environment, Southeast University, Nanjing 210096, PR China;2. School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing 211171, PR China;3. Department of Automation Engineering, Nanjing Institute of Mechatronic Technology, Nanjing 211135, PR China;4. Nanjing SolarU Energy Saving Technology Co., Ltd., Nanjing 210028, PR China;5. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, 2999 North Ren''min Road, Shanghai, 201620, PR China |
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Abstract: | Recent advances in composite materials, especially semiconductor materials incorporating ionic conductor materials, have led to significant improvements in the performance of low-temperature fuel cells. In this paper, we present a semiconductor LNCA (LiNi0.8Co0.15Al0.05O2-δ) which is often used as electrode material and ionic Sm-doped ceria (SDC; Ce0.8Sm0.2O2-δ) composite electrolyte, sandwiched between LNCA thin-layer electrodes in a configuration of Ni-LNCA/SDC-LNCA/LNCA-Ni. The incorporation of the semiconductor LNCA into the SDC electrolyte with optimized weight ratios resulted in a significant power improvement, from 345 mW cm?2 with a pure SDC electrolyte to 995 mW cm?2 with the ionic-semiconductor SDC-LNCA one where the corresponding ionic conductivity reaches 0.255 S cm?1 at 550 °C. Interestingly, the coexistence of ionic and electron conduction in the SDC-LNCA membrane displayed not any electronic short-circuiting but enhanced the device power outputs. This study demonstrates a new fuel cell working principle and simplifies technologies of applying functional ionic-semiconductor membranes and symmetrical electrodes to replace conventional electrolyte and electrochemical technologies for a new generation of fuel cells, different from the conventional complex anode, electrolyte, and cathode configuration. |
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Keywords: | Low temperature fuel cells Functional ionic-semiconductor membranes Symmetrical electrodes Composite electrolyte |
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