Electrochemical oxidation of catalytic grown carbon fiber in a direct carbon fuel cell using Ce0.8Sm0.2O1.9-carbonate electrolyte

Yu, Jinshuai; Yu, Biao; Li, Yongdan

doi:10.1016/j.ijhydene.2013.02.113

Cited by 39 publications

(17 citation statements)

References 29 publications

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“…Studies on influence of carbon properties in Solid Oxide Fuel Cell (SOFC) are scarce. [11][12][13] This could be due to difficulty in direct oxidation of solid carbon in SOFCs. Nevertheless, recent work indicates that amorphous carbon is electrochemically more active than graphitic carbon.…”

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confidence: 99%

Performance of Direct Carbon Fuel Cells Operated on Coal and Effect of Operation Mode

Chien

Arenillas

Jiang

et al. 2014

J. Electrochem. Soc.

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Previous experimental results have shown that a system with molten carbonate and solid oxide electrolyte is feasible for Direct Carbon Fuel Cell (DCFC). A study is presented to investigate cell performance with a range of solid carbon (i.e. coals, biochars, graphite) and operation mode in this hybrid electrolyte system. The results show that less crystalline coal with high fixed carbon, low sulfur, medium volatile material and moisture is best suited to this system. Using high rank of fuel such as anthracite coal, good cell performance can be obtained only by elevating temperature and with adequate pretreatment to remove impurities. Discussion of cell operation indicates that cell degradation and operation failure were due to coal agglomeration, ash buildup, and limited fuel supply in potentiostatic mode. Instead, galvanostatic operation gave stable cell performance over 60 hours. This result allows better understanding of anode reaction mechanism on the hybrid electrolyte system. Thus, long-term operation is promised when suitable solid fuel and optimized operation parameters are applied. Direct Carbon Fuel Cell (DCFC) is a promising technology to use solid carbon for energy production. This technology allows direct conversion of chemical energy to electricity, thus giving a high thermodynamic efficiency, i.e. 100%, when carbon is oxidized to carbon dioxide. The concept of DCFC is simple. Solid carbon is fed to a fuel cell and electrochemically oxidized at the anode to produce electricity.1-3 Pure product, carbon dioxide (CO 2 ), is obtained in complete oxidation and is easy for carbon sequestration. Furthermore, application of DCFC benefits from sufficient fuel supply with abundant coal and biomass in the world. These advantages as well as established infrastructure of transportation, storage, and processing for solid carbon make a DCFC feasible and very attractive.One of design challenges to develop a DCFC is choice of fuel. 4Despite large reserves of solid carbon available, different sources of carbon have varying activity and indeed affect DCFC performance. In the past, many attempts have been made to evaluate effect of solid carbon on DCFC for electric power generation. Cooper et al. 5 reported cell polarization on nine particulate carbon derived from fuel oil, coal, biochar, petroleum coke, etc. The highest discharge rate, 100-125 mA cm −2 at 0.8 V and 800• C, was obtained with biochar-derived carbon. They found that properties of carbon fuel which control discharging rates are (i) crystallographic disorder, (ii) electrical conductivity, (iii) active surface sites, and (iv) sulfur and ash impurities. Less graphitized and high disordered carbon such as chars is more reactive to oxidation; however, this property counterbalances electrical conductivity since chars are poor conductors. By contrast, neither particle size, surface area, nor morphology was found to have much impact on the electrochemical discharge rate. Moreover, Zhu et al 6 investigated factors that determine performance of carbon fuel in the D...

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confidence: 99%

Performance of Direct Carbon Fuel Cells Operated on Coal and Effect of Operation Mode

Chien

Arenillas

Jiang

et al. 2014

J. Electrochem. Soc.

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“…The degree to which gaseous CO 2 reacts with solid carbon in the DCFC, i.e., reverse Boudouard gasification (Equation ), is dictated by a number of variables such as carbon fuel, gaseous atmosphere, and the applied electric field, which polarizes the fuel, thus possibly suppressing carbon corrosion …”

Section: Resultsmentioning

confidence: 99%

Carbon Gasification from a Molten Carbonate Eutectic

2019

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This investigation explores the impact of using a ternary alkali metal carbonate eutectic, i.e., Li2CO3, Na2CO3, and K2CO3 (43.5: 31.5: 25 mol%, respectively), as a catalyst for carbon gasification under CO2 and non‐CO2 atmospheres. Gasification under CO2, i.e., the reverse Boudouard reaction, is a well‐understood process with considerable commercial interest. However, in the context of direct carbon fuel cell (DCFC) operations, it is a parasitic reaction because it consumes fuel without producing power. In this study, the effect on carbon gasification of a common DCFC electrolyte is examined. Thermogravimetric analysis shows gasification occurring in the absence of a CO2 atmosphere, which has significant implications for DCFCs using alkali metal carbonates as the secondary electrolyte. A combined reaction mechanism is proposed which entails gasification from carbonate and carbonate decomposition.

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“…The presence of Boudouard reaction at open circuit was also suppressed by Ref. [29] when tested a three-layer DCFC with catalytic grown carbon fiber. Fig.…”

Section: Evaluation Of the Effect Of Temperature On The Dcfc Performancementioning

confidence: 88%

“…The high conductivity of the biochar at high temperature (700 C) could facilitate the electron transfer and the carbon electrochemical oxidation reactions on the anode. Furthermore, the disordered structure of the biochars is aligned with the increased power density because both carbon fiber and graphite which are known by their high cristallinity [29] exhibits the lowest power density.…”

Section: Evaluation Of Ow-c In the Dcfc Systemmentioning

confidence: 99%

Investigation of chemical and electrochemical reactions mechanisms in a direct carbon fuel cell using olive wood charcoal as sustainable fuel

Elleuch

Halouani

2015

Journal of Power Sources

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Electrochemical oxidation of catalytic grown carbon fiber in a direct carbon fuel cell using Ce0.8Sm0.2O1.9-carbonate electrolyte

Cited by 39 publications

References 29 publications

Performance of Direct Carbon Fuel Cells Operated on Coal and Effect of Operation Mode

Performance of Direct Carbon Fuel Cells Operated on Coal and Effect of Operation Mode

Carbon Gasification from a Molten Carbonate Eutectic

Investigation of chemical and electrochemical reactions mechanisms in a direct carbon fuel cell using olive wood charcoal as sustainable fuel

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