Insight into graphite oxidation in a NiO-based hybrid direct carbon fuel cell
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A direct carbon fuel cell is an electricity generation device using solid carbon as a fuel directly with no reforming process. In this study, three-carbon fuels, graphitic carbon (GC), carbon black (CB), and biomass carbon (BC) are tested as the fuel to investigate the influence of carbon fuel properties on the cell performance in HDCFC with a traditional nickel oxide as the anode. Either an electrolyte-supported cell with a thin nickel oxide anode or an anode-supported cell with a thick nickel oxide anode is used to evaluate the electrochemical reactivity of carbon samples. These three-carbon fuels are characterised on the crystal structure, particle size, composition, and surface property. It is found that GC shows excellent cell performance on thin nickel oxide anode. However, it displays relatively slow electrochemical reactivity on the thick anode due to its great extent of carbon oxidation. BC shows good initial cell performance but fast degradation of the cell performance, as much more hydrogen is released at the beginning of the cell test. The anode reactions of HDCFCs are explored by the in-situ gas analysis in open circuits and under current load conditions. It is observed that GC produces the highest amount of CO among these three fuels, suggesting that carbon oxidation is the dominant electrochemical process in HDCFCs after a certain time when most of the hydrogen is released from the pyrolysis process.
Jiang , C , Cui , C , Ma , J & Irvine , J T S 2019 , ' Insight into graphite oxidation in a NiO-based hybrid direct carbon fuel cell ' , International Journal of Hydrogen Energy , vol. In press . https://doi.org/10.1016/j.ijhydene.2019.08.208
International Journal of Hydrogen Energy
Copyright © 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.ijhydene.2019.08.208
DescriptionThis work was supported by Sichuan Science and Technology Program (2019YFH0177), the talent introduction plan of Sichuan University of Science and Engineering (2016RCL36, 2016RCL37), the enterprise cooperation project of Sichuan Oil Technology Co. Ltd. (HX2017087); and the opening project of Material Corrosion and Protection Key Laboratory of Sichuan Province (2017CL11 and 2017CL13), China. CJ acknowledges the Royal Society of Edinburgh for an RSE BP Hutton Prize in Energy Innovation.
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