Single-Chamber SOFCs Using Dimethyl Ether and Ethanol

Yano, Mitsuyasu; Kawai, Takanori; Okamoto, Katsushi; Nagao, Masahiro; Sano, Mitsuru; Tomita, Atsuko; Hibino, Takashi

doi:10.1149/1.2747326

Cited by 19 publications

(17 citation statements)

References 17 publications

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“…However, operation with other fuels such as propane [52][53][54], higher hydrocarbons [52,55] or even liquid fuels [56] has also been reported. The gas mixture is characterized by the fuel-to-oxygen ratio, R mix .…”

Section: Working Principles Of Sc-sofcsmentioning

confidence: 99%

“…Hibino et al [56] also were the first group to investigate the use of alternative, liquid fuels such as dimethyl ether and ethanol. Using the heating effect generated by the fuel oxidation reactions, operation became possible at temperatures as low as 300 °C.…”

Section: Fuel-air Mixturesmentioning

confidence: 99%

“…Exploiting the heating effect generated by the fuel oxidation reactions, SC-SOFCs were shown to operate on liquid fuels such as dimethyl ether and ethanol at low temperatures of 300 °C [56]. Based on OCV measurements, optimal flow rate and R mix could be determined for each fuel.…”

Section: Liquid Fuelsmentioning

confidence: 99%

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Single-Chamber Solid Oxide Fuel Cell Technology—From Its Origins to Today’s State of the Art

2010

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Abstract:In single-chamber solid oxide fuel cells (SC-SOFCs), both anode and cathode are situated in a common gas chamber and are exposed to a mixture of fuel and oxidant. The working principle is based on the difference in catalytic activity of the electrodes for the respective anodic and cathodic reactions. The resulting difference in oxygen partial pressure between the electrodes leads to the generation of an open circuit voltage. Progress in SC-SOFC technology has enabled the generation of power outputs comparable to those of conventional SOFCs. This paper provides a detailed review of the development of SC-SOFC technology.

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Section: Working Principles Of Sc-sofcsmentioning

confidence: 99%

Section: Fuel-air Mixturesmentioning

confidence: 99%

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Single-Chamber Solid Oxide Fuel Cell Technology—From Its Origins to Today’s State of the Art

2010

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“…This problem can be overcome either by adding water, which will help reforming the ethanol into H 2 , CO and CH 4 that in turn can be directly converted in the SOFC or by developing new anode materials, inactive towards C-deposition [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Diethelm¹,

herle²

2011

Journal of Power Sources

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This study investigates the performance of a standard Ni-YSZ anode supported cell under ethanol steam reforming operating conditions. Therefore, the fuel cell was directly operated with a steam/ethanol mixture (3 to 1 molar). Other gas mixtures were also used for comparison to check the conversion of ethanol and of reformate gases (H 2 , CO) in the fuel cell. The electrochemical properties of the fuel cell fed with 4 different fuel compositions were characterized between 710 and 860°C by I-V and EIS measurements at OCV and under polarization. In order to elucidate the limiting processes, impedance spectra obtained with different gas compositions were compared using the derivative of the real part of the impedance with respect of the natural logarithm of the frequency.Results show that internal steam reforming of ethanol takes place significantly on Ni-YSZ anode only above 760°C. Comparisons of results obtained with reformate gas showed that the electrochemical cell performance is dominated by the conversion of hydrogen. The conversion of CO also occurs either directly or indirectly through the water-gas shift reaction but has a significant impact on the electrochemical performance only above 760°C.

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“…Similar to conventional dual-chamber SOFCs, GDC-and SDC-based electrolytes are being investigated for intermediate-and low-temperature operation [44,45]. Compared with YSZ, cells with a SDC electrolyte showed higher current densities and lower ohmic resistance [44].…”

Section: Electrolyte Materialsmentioning

confidence: 99%

Single‐Chamber Fuel Cells

Napporn

Kühn

2012

Fuel Cell Science and Engineering

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IntroductionIncreasing energy demands, environmental and availability issues related to the use of fossil fuels, and technical progress and downsizing of high-performance electronic systems are challenging us to develop clean, efficient, easily accessible, and rechargeable power-generating systems. Fuel cells have emerged as promising candidates for efficiently producing clean energy for various applications. High efficiencies are expected as these systems are not Carnot limited, and the chemical energy of the fuel and oxidant is directly converted into electrical energy. However, the costs of such systems are still high and are largely due to the nature of the materials used (catalysts, electrolytes, bipolar plates, and their accessories). Conventional fuel cells use two sealed, separate compartments for the fuel and the oxidant. The fuel and the oxidant can then be supplied separately to the respective electrodes, permitting controlled reactions at each electrode necessary for high cell performance. Gas management and manifolding, however, add additional costs to the system and become especially challenging when several single cells are to be assembled in stacks, and for miniaturized fuel cell systems. Moreover, the two gas compartments need to be gas-tight and adequate sealing is required that is chemically and thermomechanically compatible with the cell component materials and can withstand operation at elevated temperatures and during heating-cooling cycles. In solid oxide fuel cells (SOFCs), a high-temperature fuel cell system, common sealants are glass and ceramic materials that face long-term stability and durability issues and can crack during operation of the fuel cell.The single-chamber fuel cell (SC-FC) is a sealing-free fuel cell in which both electrodes are situated in a single compartment and a mixture of fuel and oxidant is supplied directly to the cell (Figure 2.1). SC-FCs promise higher thermomechanical strength in addition to a compact and simplified design. However, single-chamber operation requires selective electrode materials that catalyze the fuel reaction only at the anode and the oxidant reduction only at the cathode. The SC-FC concept dates back to fuel cell research for applications in space in the 1960s [1]. During the last 30 years, the performance of SC-FCs has increased considerably, mainly due to the

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Single-Chamber SOFCs Using Dimethyl Ether and Ethanol

Cited by 19 publications

References 17 publications

Single-Chamber Solid Oxide Fuel Cell Technology—From Its Origins to Today’s State of the Art

Single-Chamber Solid Oxide Fuel Cell Technology—From Its Origins to Today’s State of the Art

Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Single‐Chamber Fuel Cells

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