Effect of pressure for direct fuel cells using DME-based fuels

Im, JiYoung; Kim, Bum Soo; Choi, Hyoukryeol; Cho, Sung Min

doi:10.1016/j.jpowsour.2007.12.046

Cited by 26 publications

(11 citation statements)

References 6 publications

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“…It is obvious that the flow rate change from 40 to 140 sccm does not have much impact on the DDMEFC performance. However, the performance is enhanced noticeably with the increase of anode backpressure from 10 to 30 psig and this result is in good agreement with previous reports (7,10). In the present research, DME is fed in gas phase into the fuel cell with water vapor at 85 °C and the amount of water supplied is insufficient for complete electro-oxidation of DME (The mole ratio of DME and water in complete oxidation reaction of DME is 1:3, but in the gas feed conditions this ratio is 1:2.2, (10)).…”

Section: Resultssupporting

confidence: 93%

“…The dependence of MEA performance on the membrane thickness has been studied by Mench et al (8). Optimization of performance by varying conditions such as temperature, backpressure, feed type, flow field types and addition of a second fuel to DME has been studied in the series of works by Cho and co-workers (5,6,9,10). Yin et al (11)(12)(13) has investigated the effects of the composition of catalyst layers and gas diffusion layers (GDLs) on the DDMEFC performance.…”

Section: Introductionmentioning

confidence: 99%

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Anode Catalysts for the Direct Dimethyl Ether Fuel Cell

Li¹,

Wu²,

Johnston³

et al. 2011

ECS Trans.

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For the last decade, dimethyl ether (DME) has been considered a promising alternative fuel for direct fuel cells because of several advantages over methanol. In this work, PtRu catalysts with a wide range of Pt-to-Ru ratios were screened for the direct DME fuel cell (DDMEFC) performance for the first time. Overall, Pt 50 Ru 50 performs best in the high and middle voltage ranges, whereas Pt 80 Ru 20 performs best at low voltages. A maximum power density of 0.10 W/cm 2 is achieved at a current density of 0.37 A/cm 2 . In spite of using gaseous DME feed, the measured performance exceeds the best previously published results. The anode activity and fuel crossover of a DDMEFC were investigated in this work and compared to those of a DMFC. The adsorption and electrooxidation of DME on Pt black catalyst were also studied in halfcell electrochemical measurements.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Anode Catalysts for the Direct Dimethyl Ether Fuel Cell

Li¹,

Wu²,

Johnston³

et al. 2011

ECS Trans.

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“…The effect is most likely caused by the lower fuel crossover and reduced impact on the cathode performance. the achieved DDMEFC performance is higher than the best performance published to date [21]. Electrooxidation of DME and methanol on the Pt 50 Ru 50 black catalyst was also studied in an electrochemical cell at 25°C (Fig.…”

Section: Ddmefc Vs Dmfcmentioning

confidence: 87%

Direct Dimethyl Ether Fuel Cell with Much Improved Performance

Johnston

et al. 2014

Electrocatalysis

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Due to several apparent advantages over methanol, dimethyl ether (DME) has been viewed as a promising alternative fuel for direct fuel cell technology. Similar to methanol, DME oxidation requires a surface oxidant, such as OH, for the removal of adsorbed CO. Consequently, the reaction occurs at much faster rates on binary PtRu catalysts than Pt alone. In this work, PtRu catalysts with a wide variety of Pt-to-Ru ratios were systematically studied in the direct DME fuel cell (DDMEFC) operating at 80°C. A Pt 50 Ru 50 catalyst was found to perform the best at high and middle voltages, while a Pt 80 Ru 20 catalyst performed best at low voltages. DDMEFC operation conditions, such as DME flow rate, anode back pressure, DME-to-water molar ratio, and membrane thickness, were also studied in order to maximize the cell performance. A maximum power density of 0.12 W cm −2 obtained in this work exceeds the highest reported DME performance.In comparison with the direct methanol fuel cell (DMFC), the optimized DDMEFC performs better at cell voltages higher than 0.55 and 0.49 V with feed concentrations of methanol of 0.5 and 1.0 M, respectively.

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“…[27][28][29] Direct DME based fuel cells are also being studied. 30,31 Methanol and DME, besides their use as transportation fuels, are proven and increasingly utilized starting materials for producing ethylene and propylene in the so-called methanol to olefin (MTO) process. 32,33 Acidic zeolitic solid catalysts such as SAPO-34 and ZSM-5 are most commonly used for this reaction.…”

Section: Introductionmentioning

confidence: 99%

Chemical Recycling of Carbon Dioxide to Methanol and Dimethyl Ether: From Greenhouse Gas to Renewable, Environmentally Carbon Neutral Fuels and Synthetic Hydrocarbons

2008

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Published on Web 12/08/2008 Further, one of the major challenges of our time is to find efficient new solutions beyond our diminishing fossil fuels resources (oil, natural gas, coal) and the grave environmental consequences of excessive combustion of carbon-containing fuels and their products. The concept of the "Methanol Economy" that we have developed hinges on the chemical recycling of CO 2 to useful fuels. (i.e., methanol and DME) and other products. 1,2 At the same time, it renders carbon-containing fuels renewable (on the human time scale) and environmentally neutral. This not only allows us to mitigate a major human made cause of global warming but also provides us with an inexhaustible and generally available carbon source for ages to come.

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Effect of pressure for direct fuel cells using DME-based fuels

Cited by 26 publications

References 6 publications

Anode Catalysts for the Direct Dimethyl Ether Fuel Cell

Anode Catalysts for the Direct Dimethyl Ether Fuel Cell

Direct Dimethyl Ether Fuel Cell with Much Improved Performance

Chemical Recycling of Carbon Dioxide to Methanol and Dimethyl Ether: From Greenhouse Gas to Renewable, Environmentally Carbon Neutral Fuels and Synthetic Hydrocarbons

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