期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 45, 期 43, 页码 23368-23377出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.06.065
关键词
Solid oxide fuel cell; Direct carbon; Sr catalyst; Boudouard reaction; Coconut active charcoal
资金
- National Natural Science Foundation of China [21908133, 51702189, 21808128, 51904136]
- Natural Science Foundation of Shandong Province [ZR2018BB062]
- Key R&D Program of Shandong Province [2019GGX103016]
- SDUT & Zibo City Integration Development Project [2019ZBXC147]
As a new way of power generation, direct carbon solid oxide fuel cells (DC-SOFCs) exhibit great potential in solution of energy crisis and environmental pollution. According to the working principle, the cell operation is a kinetically controlled process, and the reverse Boudouard reaction is the rate-determining step of the whole system. In this study, a Srbased catalyst is successfully introduced to accelerate carbon gasification and thus enhance cell performance of DC-SOFCs. The electrochemical performance of DC-SOFCs operated on coconut active charcoal with various Sr loading contents (3 wt%-10 wt%), are studied and compared with that of DC-SOFCs with traditional Fe-catalyzed carbon fuel. Experimental results demonstrate that the best output of 316 mW cm(-2) is achieved from the single cell powered with 5 wt% Sr-loaded coconut active charcoal at 850 degrees C, higher than those of DC-SOFCs fueled by pure and 5 wt% Fe-loaded active charcoal. The superiority of the Sr-based catalyst is also demonstrated by the operation stability of the corresponding DC-SOFC, which displays a relatively long operation time of 22.68 h at 0.25 A cm(-2) with the fuel utilization of 18.3%. The SEM/EDX results indicate that the Sr-based catalyst exhibits good stability without agglomeration during cell operation at high temperature. In addition, the carbon gasification mechanism catalyzed by Sr-based catalyst is also proposed on the basis of these properties. This study indicates that the designed Sr-loaded coconut active charcoal is expected to be an alternative carbon fuel for DC-SOFCs. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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