Carbon Deposition and Power Density in Rechargeable Direct Carbon Fuel Cells with Gadolinium-doped Ceria and Scandium-stabilized Zirconia

Tagawa, Yuki; Ohba, Fuhito; Takei, Chikara; Ihara, Masataka

doi:10.1149/1.3205641

Cited by 8 publications

(14 citation statements)

References 12 publications

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“…), producing CO 2 in the anode (CO 2 a ) in the total reaction [8].Theoretical OCV of a DCFC can be calculated from molar Gibbs free energy change ( ) of the total reaction [8] using the Nernst equation [9] as follows: [10] where ΔG of the total reaction is expressed as standard ( ) of the reaction (C graphite + O 2 → CO 2 , 1 atm, 1173 K,), activity of solid carbon ( ), partial pressure of CO 2 in the anode side (…”

Section: Improvement In Propane-based Fuel Utilizationmentioning

confidence: 99%

“…The theoretical OCV ( ) of a DCFC that uses YSZ for electrolyte can be obtained from the ΔG and the Nernst equation [10], and expressed as follows in equation [14]. This equation suggests that of the DCFC depends on the partial pressure of O 2 ( , the same as the dependence of OCV of other SOFCs.…”

Section: Improvement In Propane-based Fuel Utilizationmentioning

confidence: 99%

“…Our group proposed a Rechargeable Direct Carbon Fuel Cells (RDCFC), which is an SOFC-based new type of DCFC using pyrolytic carbon as fuel (5)(6)(7)(8)(9)(10)(11)(12)(13). RDCFCs use hydrocarbon for power generation as follows.…”

Section: Introductionmentioning

confidence: 99%

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Power Generation of Rechargeable Direct Carbon Fuel Cells with Batch-Type Charging System

Tanaka

Yabuki

et al. 2013

ECS Trans.

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Rechargeable Direct Carbon Fuel Cells (RDCFCs) use deposited pyrolytic carbon as fuel. With a batch-type charging system, the change in the amount of deposited carbon as a function of pyrolysis time was monitored in order to estimate the optimal pyrolysis time and to improve the propane-based fuel utilization. When the pyrolysis time was 5 min, the propane-based fuel utilization efficiency of RDCFCs was improved from 3% to 35% at a power density between 60-80 mW/cm 2 compared to previous RDCFCs. The improvement was due to a high conversion rate to carbon (73%) from propane to solid carbon caused by longer pyrolysis time. The effects of hydrogen in RDCFC power generation were also investigated because in the pyrolysis of hydrocarbon, hydrogen is also produced. Results indicate that existence of hydrogen seems to promote the utilization of solid carbon.

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Section: Improvement In Propane-based Fuel Utilizationmentioning

confidence: 99%

Section: Improvement In Propane-based Fuel Utilizationmentioning

confidence: 99%

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Power Generation of Rechargeable Direct Carbon Fuel Cells with Batch-Type Charging System

Tanaka

Yabuki

et al. 2013

ECS Trans.

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“…Our research group previously considered the efficient use of solid carbon as fuel and proposed a new type of SOFC in which the solid carbon deposited on the anode by thermal decomposition of hydrocarbon is used as fuel (12)(13)(14)(15)(16)(17)(18)(19)(20)(21). These fuel cells are called "Rechargeable Direct Carbon Fuel Cells (RDCFCs)".…”

Section: Introductionmentioning

confidence: 99%

Effects of Gas Composition Just before Fuel Pulses on Power Generation Characteristics at Different Fuel Supply Frequency in Pulse Jet-Rechargeable Direct Carbon Fuel Cells

et al. 2014

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Pulse Jet - Rechargeable Direct Carbon Fuel Cells (PJ-RDCFCs), in which small amounts of liquid hydrocarbon are supplied by pulse jet, were found to show different power generation characteristics depending on the time interval between fuel pulses (T int). For the T int range studied here (1 to 210 sec), both the maximum terminal voltage during a single cycle and the increase rate just after a fuel pulse can be controlled by T int, and this T int determines the fuel utilization and partial pressure of H2O and CO2. Thus, the gas composition just before a fuel pulse determines the degree of reforming reaction and chemical species contributing to the electrochemical reaction, which affects the power generation characteristics. Power generation at extremely short T int (1 sec) revealed that during pulse jetting, the terminal voltage was stable. Its average power density was 445 mW/cm2, which is high for electrolyte-supported SOFCs that use liquid hydrocarbon.

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“…To achieve stable operation with direct hydrocarbon fuels, many researchers have proposed Ni-free anodes such as copper-based cermet 8,9 and all-ceramic anodes. [10][11][12][13][14] Although Ni-free anodes are highly stable in dry hydrocarbon fuel, their lower catalytic activity makes their performance inferior to that of Ni/YSZ anodes.…”

mentioning

confidence: 99%

Electrochemical Behaviors of Nickel/Yttria-Stabilized Zirconia Anodes with Distribution Controlled Yttrium-Doped Barium Zirconate by Ink-jet Technique

Shimada¹,

Ohba²,

Li³

et al. 2012

J. Electrochem. Soc.

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The relationship between the electrochemical performance of an anode in a solid oxide fuel cell and the distribution of yttrium-doped barium zirconate (BZY) in the electrochemically active zone of nickel (Ni)/yttria-stabilized zirconia (YSZ) anodes was investigated to clarify the promoting effect of BZY on electrochemical reaction. After BZY was injected into Ni/YSZ anodes using an ink-jet technique for control of the distribution of BZY, the anode performance improved in both humidified H 2 and dry CH 4 fuels. The performance of the BZY-infiltrated Ni/YSZ anodes depended on the distribution of BZY; an increasing gradient of BZY from the electrolyte side to the anode surface side was particularly effective in improving the performance. These results suggest that the optimum amount of infiltrated BZY to enhance the electrochemical reaction depended on the distribution of the oxygen chemical potential in the Ni/YSZ anodes. According to the competitive adsorption equilibrium of reactants and the Langmuir-type reaction on the surface of Ni at the triple-phase boundary, the oxygen coverage was a critical factor in the electrochemical reaction and depended on the oxygen chemical potential. In conclusion, the enhanced electrochemical reaction in the BZY-infiltrated Ni/YSZ anodes was therefore due to the increased oxygen coverage.

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Carbon Deposition and Power Density in Rechargeable Direct Carbon Fuel Cells with Gadolinium-doped Ceria and Scandium-stabilized Zirconia

Cited by 8 publications

References 12 publications

Power Generation of Rechargeable Direct Carbon Fuel Cells with Batch-Type Charging System

Power Generation of Rechargeable Direct Carbon Fuel Cells with Batch-Type Charging System

Effects of Gas Composition Just before Fuel Pulses on Power Generation Characteristics at Different Fuel Supply Frequency in Pulse Jet-Rechargeable Direct Carbon Fuel Cells

Electrochemical Behaviors of Nickel/Yttria-Stabilized Zirconia Anodes with Distribution Controlled Yttrium-Doped Barium Zirconate by Ink-jet Technique

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