Performance of an Intermediate-Temperature Fuel Cell Using a Proton-Conducting Sn[sub 0.9]In[sub 0.1]P[sub 2]O[sub 7] Electrolyte

Heo, Pilwon; Shibata, Hidetaka; Nagao, Masahiro; Hibino, Takashi; Sano, Mitsuru

doi:10.1149/1.2183927

Cited by 48 publications

(43 citation statements)

References 17 publications

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“…We have recently reported that 10 mol % In 3+ -doped SnP 2 O 7 (Sn 0.9 In 0.1 P 2 O 7 ) shows high proton conductivities of above 10 À1 S cm À1 between 100 and 350 8C under water-free conditions. [13] This material has also been used as an electrolyte in fuel cells, [14] and herein we report the selective oxidation of methane to methanol in a hydrogen-oxygen fuel cell containing Sn 0.9 In 0.1 P 2 O 7 as electrolyte.…”

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confidence: 86%

Direct Oxidation of Methane to Methanol at Low Temperature and Pressure in an Electrochemical Fuel Cell

2008

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confidence: 86%

Direct Oxidation of Methane to Methanol at Low Temperature and Pressure in an Electrochemical Fuel Cell

2008

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“…Firstly, the ohmic resistance was strongly dependent on the operation temperature, which reflects the large proton conductivity dependence of the electrolyte on the temperature. 46,47 Secondly, the charge-transfer resistance was reduced by an increase in the temperature, which is ascribed to the enhanced kinetics of both the redox reaction at the anode and the ORR/OER at the cathode at elevated temperatures. Thirdly, the sharp rise in the low frequency range was not parallel to the imaginary axis, which indicates that these electrodes do not function as simple EDL electrodes.…”

Section: +mentioning

confidence: 99%

Rechargeable PEM Fuel-Cell Batteries Using Porous Carbon Modified with Carbonyl Groups as Anode Materials

Kobayashi

Nagao

Yamamoto

et al. 2015

J. Electrochem. Soc.

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Rechargeable fuel-cell batteries (RFCBs) operate by hydrogen storage and release at the anode, while oxygen evolution and reduction reactions occur at the cathode. High-surface-area porous carbon was treated with HNO 3 to produce an anode material with carbonyl and phenol groups on the surface, thereby providing redox sites for hydrogen storage and release. The HNO 3 -activated carbon anodes were characterized with respect to use in a RFCB operated from room temperature to 75 • C with a voltage range of 0-2.0 V. The quantity of carbonyl groups and the corresponding reduced phenol groups increased with the O/C atomic ratio of the oxygenated carbon, by which the electrical capacity was increased to reach a maximum of 125 mAh g −1 at an O/C atomic ratio of 0.114. The optimal temperature and charge voltage for performance and cyclability were determined to be 50 • C and 1.25 V, respectively. The charge and discharge times remained at ca. 93% of the respective initial values after 300 cycles. The RFCB with the modified porous carbon anode provided energy densities of 2.5-13.8 Wh kg −1 and power densities of 46.4-296.3 W kg −1 (normalized according to the mass of the entire cell). Problems with energy supply and use are related not only to global warming, but also to environmental issues, and this has accelerated the development of highly efficient and environmentally-friendly power sources.1-3 In recent years, metal-air batteries have been the focus of significant interest in the field of advanced energy storage systems because they employ a lighter cathode that operates on abundant oxygen in the air.4,5 While these batteries offer the promise of very high energy densities, they only deliver current densities in the order of 1 mA cm −2 , 6 which are one or two orders of magnitude lower than the required level. Safety and cyclability concerns must also be addressed for practical applications. In contrast, hydrogen-air fuel cells draw far higher current densities than those for metal-air batteries, while achieving energy densities comparable to those for metal-air batteries. 7,8 Nevertheless, fuel must be continuously supplied from an external source; therefore, hydrogen production, storage, and distribution are required. To avoid the obstacles associated with these systems, rechargeable fuel cell systems, which operate with alternate electrolyzer and fuel cell modes, are considered an attractive and potentially viable power source.9-11 The key technology necessary for this application is hydrogen storage with high capacity and good cyclability. Currently, the standard hydrogen storage methods are cryo-adsorption on activated carbon, compressed gas tanks, and metal hydrides.12,13 However, hydrogen tanks require high pressures, while metal hydride systems release hydrogen at high temperatures, which would mean the fuel cell and the hydrogen storage systems would have to be separate.As an alternative approach, a new concept of a unitized rechargeable fuel cell has been proposed by integration of a fuel cell with a hydrog...

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“…A fuel cell using the thin Sn0.9In0.1P2O7 electrolyte membrane yielded the best power density of 264 mW・cm -2 under unhumidified hydrogen/air conditions 23) . Moreover, an attempt to apply these materials as ionomers for the cathode at intermediate temperatures was also made 29), 30) .…”

Section: )～28)mentioning

confidence: 99%

“…However, these power density values are much lower compared to those expected from the ohmic resistances (as an example, 0.24 Ω・cm 2 at 200℃) of the electrolyte, which could be ascribed to the large polarization resistance of the Pt/C cathode used. One of the main reasons for the poor ORR activity is thought to be the lack of proton conduction in the catalyst layer 12), 23) . The ORR occurs at the three-phase bound ary (TPB) (gas-phase/electrode/electrolyte) where all electrons, protons, and gases are available.…”

Section: Use Of Sn09in01p2o7 As Ionomers For Cathode Inmentioning

confidence: 99%

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Development and Application of SnP<sub>2</sub>O<sub>7</sub>-based Proton Conductors to Intermediate-temperature Fuel Cells

Jin

Lee

Hibino

2010

J. Jpn. Petrol. Inst.

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Much attention has been devoted to efforts to operate polymer electrolyte fuel cells (PEFCs) at temperatures above 100℃ in order to avoid the problem of serious CO poisoning of the anode catalyst. It is also of great con cern to operate PEFCs under low-humidity conditions, because the space and energy required for external humidi fication are eliminated or minimized in the fuel cell system. Thus, proton-conducting materials that can satisfy the above criteria have been proposed, developed, and evaluated worldwide. In particular, recent research efforts have been increasingly focusing on the design of anhydrous proton conductors, since these materials, at least in principle, do not need the presence of water as a charge carrier. We have recently found that In, Al, or Mg-doped SnP2O7 show high proton conductivities＞10-1 S・cm -1 between 150 and 350℃ under water-free conditions. Attempts to apply these materials as electrolytes in some electrochemical devices were also made. This paper presents an overview of the current status of doped SnP2O7 with principal emphasis on the materials aspect. In addition, the benefits of intermediate-temperature fuel cells using these materials are briefly summarized in terms of cell design, electrolyte and electrode materials.

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Performance of an Intermediate-Temperature Fuel Cell Using a Proton-Conducting Sn[sub 0.9]In[sub 0.1]P[sub 2]O[sub 7] Electrolyte

Cited by 48 publications

References 17 publications

Direct Oxidation of Methane to Methanol at Low Temperature and Pressure in an Electrochemical Fuel Cell

Direct Oxidation of Methane to Methanol at Low Temperature and Pressure in an Electrochemical Fuel Cell

Rechargeable PEM Fuel-Cell Batteries Using Porous Carbon Modified with Carbonyl Groups as Anode Materials

Development and Application of SnP<sub>2</sub>O<sub>7</sub>-based Proton Conductors to Intermediate-temperature Fuel Cells

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