Structure and Phase Transitions of SnP2O7

Gover, Richard K. B.; Withers, Neil; Allen, S. J.; Withers, Raymond; Evans, John S. O.

doi:10.1006/jssc.2002.9554

Cited by 80 publications

(69 citation statements)

References 20 publications

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“…This was similar to the peaks exhibited by P m O n impurities (Figure 3a). The XRD patterns obtained at room temperature did not change after heat treatment (Figure 9), which to some extent support the conclusion that the phase transition from a cubic cell to a triclinic cell (at approximately 280°C) was reversible [18][19][20] 3.5 Time Dependence Figure 10 shows the variation of conductivity of Sb doped powder with time at 255°C under un-humidified air. The conductivity fell from 0.06 to 0.02 S cm -1 in the first 2 h and then was relatively stable at around 0.02 S cm -1 for a further 38 h of tests.…”

Section: Influence Of Heat Treatmentsupporting

confidence: 78%

A Sb‐doped SnP₂O₇ Solid Proton Conductor for Intermediate Temperature Fuel Cells

Verma

Scott

2008

Fuel Cells

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Sb‐doped SnP2O7 were prepared and characterised with XRD, FTIR, SEM and EIS. The preparation parameters were optimised taking into consideration the influence of H3PO4 content in the reactants and PmOn impurities. Conductivities of SnP2O7 with different Sb doping levels were studied from 100 to 300 °C in un‐humidified air. The conductivity of 20 mol‐% Sb‐doped SnP2O7 was greater than 0.1 S cm–1 at 300 °C. The effect of heat treatment was identified as an important factor in the preparation of the proton conductors. The time dependence of the conductivity demonstrated Sb‐doped SnP2O7 as a promising intermediate temperature solid proton conductor.

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Section: Influence Of Heat Treatmentsupporting

confidence: 78%

A Sb‐doped SnP₂O₇ Solid Proton Conductor for Intermediate Temperature Fuel Cells

Verma

Scott

2008

Fuel Cells

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“…The peaks observed for SnP2O7 were almost identical to those reported in the litera ture 33) . SnP2O7 has a cubic or pseudocubic structure, with SnO6 octahedra and P2O7 units at the corners and the edges, respectively.…”

Section: Effect Of In Doping In Sn1-xinxp2o7 On Proton Conductionsupporting

confidence: 84%

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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“…24) As shown in Fig. 1 (P H2O = 0.0008 atm) because a large increase in conductivity is observed with increasing P O2 under oxidizing conditions (P O2 = 0.211.0 atm).…”

Section: Proton Conduction In Acceptor-doped Snp 2 Omentioning

confidence: 69%

Intermediate-temperature proton conductors and their applications to energy and environmental devices

Hibino

2011

J. Ceram. Soc. Japan

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The development of proton conductors has proceeded rapidly in recent years. A number of organic or inorganic materials show proton conductivities of ³10 ¹2 S cm ¹1 at temperatures below 100°C. However, although there is great current demand for proton conductors capable of operating in the temperature range of 100400°C in practical applications, very few materials that can satisfy this demand have been reported to date. Acceptor-doped SnP 2 O 7 are promising candidate materials because their proton conductivities reach >10 ¹1 S cm ¹1 in the temperature range of interest. This paper presents an overview of the current status of acceptor-doped SnP 2 O 7 , highlighting the mechanism and kinetics of proton conduction and the development of electrochemical devices using these materials. New insights for proton insertion and conduction are proposed that use electrochemical techniques. Two approaches to designing SnP 2 O 7 -based composite electrolytes with good mechanical properties have also been developed for different operating temperatures. In addition, the benefits of intermediate-temperature operation using these materials are discussed in terms of practical applications, especially in fuel cells, exhaust sensors, and solid catalysts.

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Structure and Phase Transitions of SnP2O7

Cited by 80 publications

References 20 publications

A Sb‐doped SnP₂O₇ Solid Proton Conductor for Intermediate Temperature Fuel Cells

A Sb‐doped SnP₂O₇ Solid Proton Conductor for Intermediate Temperature Fuel Cells

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

Intermediate-temperature proton conductors and their applications to energy and environmental devices

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Structure and Phase Transitions of SnP2O7

Cited by 80 publications

References 20 publications

A Sb‐doped SnP2O7 Solid Proton Conductor for Intermediate Temperature Fuel Cells

A Sb‐doped SnP2O7 Solid Proton Conductor for Intermediate Temperature Fuel Cells

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

Intermediate-temperature proton conductors and their applications to energy and environmental devices

Contact Info

Product

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A Sb‐doped SnP₂O₇ Solid Proton Conductor for Intermediate Temperature Fuel Cells

A Sb‐doped SnP₂O₇ Solid Proton Conductor for Intermediate Temperature Fuel Cells