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阳极支撑型锥管串接式直接碳固体氧化物燃料电池组的制备及性能

叶梓滨, 邹高昌, 吴琪雯, 颜晓敏, 周明扬, 刘江   

  1. 华南理工大学 环境与能源学院, 广州 510006
  • 收稿日期:2023-12-27 修回日期:2024-02-18 出版日期:2024-03-08 网络出版日期:2024-03-08
  • 作者简介:叶梓滨(1998-),男,硕士研究生.E-mail: 1193676345@qq.com
  • 基金资助:
    国家自然科学基金(91745203,U1601207)

Preparation and Performances of Tubular Cone-shaped Anode-supported Segmented-in-series Direct Carbon Solid Oxide Fuel Cells

YE Zibin, ZOU Gaochang, WU Qiwen, YAN Xiaomin, ZHOU Mingyang, LIU Jiang   

  1. School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
  • Received:2023-12-27 Revised:2024-02-18 Published:2024-03-08 Online:2024-03-08
  • About author:YEZibin(1998-), male,Master candidate. E-mail: 1193676345@qq.com

摘要: 针对阳极支撑型直接碳固体氧化物燃料电池(DC-SOFC)的浓差极化阻抗大的问题, 本研究采用改进后的凝胶注模法制备了阳极支撑型锥管状固体氧化物燃料电池(SOFC)。适当增加溶剂的含量可以改善了浆料的流动性, 提高了成品的质量。增加造孔剂的含量可以提高阳极的孔隙率, 减小了阳极的扩散阻力。改进后的SOFC以氢气为燃料, 在800 ℃运行时开路电压为1.05 V, 电化学阻抗谱的极化阻抗表现更小, 电池的最大功率密度为0.67 W×cm-2(阴极有效面积:2.2 cm2), 明显优于改进前的SOFC。改进后的SOFC直接采用担载质量分数5% K的活性炭为燃料, 在800 ℃运行时, 开路电压为1.03 V, 接近于理论电压, 最大功率密度达0.74 W×cm-2, 以400 mA进行恒流放电, 碳燃料的有效利用率为31%, 高于改进前电池的碳燃料有效利用率17%。将改进后的4个锥管状单电池串联成电池组, 直接采用担载K催化剂的活性炭为燃料, 在800 ℃运行时, 最大功率达8.0 W, 高于改进前的4节DC-SOFC电池组(4.1 W), 该电池组碳燃料的有效利用率为15%, 峰值功率密度可达0.91 W×cm-2, 超过了文献报道的最高值。

关键词: 直接碳固体氧化物燃料电池, 凝胶注模法, Boudouard反应催化剂, 锥管串接式, 钾催化剂

Abstract: To solve the problem of large concentration polarization impedance of anode-supported direct carbon solid oxide fuel cells (DC-SOFCs), tubular cone-shaped anode-supported segmented-in-series solid oxide fuel cells (SOFCs) were prepared by an improved gel-casting method. By appropriately increasing the content of solvent, the fluidity of the slurry and the quality of the obtained product were improved. By increasing the content of pore former, the porosity of the anode was increased, so that the diffusion resistance of the anode was reduced. The improved SOFC was fueled by hydrogen and operated at 800 ℃, which had an open-circuit voltage of 1.05 V. The polarization impedance of the electrochemical impedance spectrum decreased, and the maximum power density of the SOFC was 0.67 W×cm-2 (the active area of the cathode: 2.2 cm2), which was significantly higher than the electrochemical performance of the SOFC before improvement. Activated carbon loaded with 5%(in mass) K as catalyst was directedly used as the fuel of SOFCs. The improved DC-SOFC gave an open circuit voltage of 1.03 V and a peak power density of 0.74 W×cm-2 at 800 ℃. The improved SOFC was discharged at a constant current of 400 mA, and the effective utilization rate of carbon fuel was 31%, which was higher than that of the SOFC before improvement (17%). Four improved tubular cone-shaped single cells were connected in series to form a four-cell stack. The improved four-cell stack reached a peak power of 8.0 W, corresponding a power density of 0.91 W×cm-2 at 800 ℃, which was higher than the four-cell stack before improvement (4.1 W), exceeded the maximum of the reported DC-SOFC pack and had an effective utilization rate of 15% for carbon fuel.

Key words: direct carbon solid oxide fuel cell, gel-casting, Boudouard reaction, cone-shaped segmented-in-series, potassium catalyst

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