固体氧化物燃料电池直接以焦炭为燃料的电性能

XIE Yong-min; LI Jiang-lin; HOU Jin-xing; WU Pei-jia; LIU Jiang; LIU Qing-sheng

固体氧化物燃料电池直接以焦炭为燃料的电性能

1.
江西理工大学冶金与化学工程学院, 江西赣州 341000
2.
华南理工大学环境与能源学院新能源研究所, 广东广州 510006

基金项目:

the National Natural Science Foundation of China 51564019

详细信息

中图分类号: O646
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- 被引次数: 0
出版历程
- 收稿日期: 2018-05-15
- 修回日期: 2018-08-18
- 网络出版日期: 2021-01-23
- 刊出日期: 2018-10-10

Direct use of coke in a solid oxide fuel cell

1.
School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2.
New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China

Funds:

the National Natural Science Foundation of China 51564019

More Information

Corresponding author: LIU Qing-sheng, Tel:+8615970132969, E-mail:397176537@qq.com

本文的英文电子版由Elsevier出版社在ScienceDirect上出版(http://www.sciencedirect.com/science/journal/18725813).

摘要

摘要: 直接碳固体氧化物燃料电池（DC-SOFC）是一种潜在的固体碳燃料高效率、低污染发电技术。本研究报道了将工业焦炭直接用作管式DC-SOFC燃料的研究。制备了电极材料为Ag-GDC（钆掺杂氧化铈）的YSZ（钇稳定化氧化锆）电解质支撑型管式固体氧化物燃料电池（SOFC）。采用拉曼光谱、扫描电镜和X射线能谱仪对焦炭燃料进行了性质表征。结果表明，焦炭燃料呈微米级的颗粒状，并含有大量对Boudouard反应有利的缺陷结构。电池以纯焦炭为燃料在850℃取得的最大功率密度为149mW/cm²，在碳燃料表面负载能提高Boudouard反应速率的Fe催化剂后，最大功率密度提高至217mW/cm²。通过电化学测试和尾气表征，分析了恒电流放电过程中电池的性能衰减机制。测试结果证明了将焦炭直接用作全固态DC-SOFC的燃料产生电能的可行性。
- 固体氧化物燃料电池 /
- 直接碳 /
- 焦炭 /
- Fe催化剂
Abstract: Direct carbon solid oxide fuel cell (DC-SOFC) is a potential technology for generating electricity from solid carbon fuel with high conversion efficiency and low pollution. In this study, the use of industrial coke as a fuel for a direct carbon solid oxide fuel cell (DC-SOFC) was investigated. Tubular yttrium-stabilized zirconia (YSZ) electrolyte-supported solid oxide fuel cells (SOFCs) with a cermet of silver and gadolinium-doped ceria (Ag-GDC) as electrode material were fabricated. Raman spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy were applied to characterize the investigated coke fuels. It was observed that the coke fuel wa micron-sized particles with many structural defects, which favored the Boudouard reaction occurring in a DC-SOFC. A peak power density of 149 mW/cm² at 850 ℃ was observed for pure coke fuel, and it improved to 217 mW/cm² when a Fe-based catalyst was added to enhance the Boudouard reaction. The degradation performance of the DC-SOFC during a discharging test was analyzed according to the electrochemical characterization and emitted gas measurements. The performed test supported the feasibility of using coke as fuel in an all-solid-state DC-SOFC to generate electricity.
- solid oxide fuel cell /
- direct carbon /
- coke /
- iron catalyst
本文的英文电子版由Elsevier出版社在ScienceDirect上出版(http://www.sciencedirect.com/science/journal/18725813).
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Figure 1 Schematic diagram of the DC-SOFC testing setup

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Figure 2 SEM images of (a) coke fuel and (b) Fe-loaded coke fuel, and (c) elemental distribution diagram for coke fuel

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Figure 3 Raman spectrum of a coke fuel sample

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Figure 4 SEM images of (a) the cross section of an as-prepared SOFC and (b) the surface of Ag-GDC electrode

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Figure 5 Electrical performance of a SOFC operated with humidified H₂ as a fuel and ambient air as the oxidant

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Figure 6 Output performance of the DC-SOFCs operated at 850 ℃

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Figure 7 Discharge curve and production rates of CO and CO₂ gas in the DC-SOFC operated at constant current of 1 A at 850 ℃, using Fe-loaded coke as fuel

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Figure 8 I-V-P characteristics of the DC-SOFC operated on Fe-loaded coke before and after discharging

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Table 1 Performance comparison of the presented DC-SOFCs with reported DC-SOFCs operated at 850 ℃

Cell configuration	Anode electrode	Carbon fuel	P_max /(mW·cm^-2) at 850 ℃	Reference
Anode-supported	Ni-ScSZ	carbon black	104	[10]
Anode-supported	Ni-YSZ	coal char	100	[19]
Electrolyte-supported	Ag-GDC	Fe-loaded activated carbon	297	[23]
Electrolyte-supported	Ag-GDC	coke	149	this work
Electrolyte-supported	Ag-GDC	Fe-loaded coke	217	this work

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