Fuel Cells with Neat Proton‐Conducting Salt Electrolytes

Gervasio, D.

doi:10.1002/9780470630693.ch11

Cited by 2 publications

(3 citation statements)

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“…In addition to considerations regarding levels of indium doping, the formation of poly(phosphoric acid) species and the presence of residual phosphoric acid were also reasons for concern when synthesizing the tin pyrophosphate samples in the presence of excess phosphoric acid. Phosphoric acid is a good proton conductor, as is evidenced by the existence of the phosphoric acid fuel cell which uses membrane-bound phosphoric acid as an electrolyte. ,, Poly(phosphoric acid)s are also expected to participate in proton conduction, as these materials are composed of polymerized chains of phosphate tetrahedra that may be protonated . In fact, some authors have suggested that proton conductivity in tin pyrophosphate samples, in which significant proton conductivity has been observed (∼10 –2 S/cm), , is actually attributable to poly(phosphoric acid) species and/or absorbed phosphoric acid .…”

Section: Resultsmentioning

confidence: 99%

“…Phosphoric acid fuel cells are currently the most commercially successful variety of intermediate-temperature (100–400 °C) fuel cells. − These devices consist of a supported phosphoric acid electrolyte that is responsible for proton conduction between the anode and the cathode, both of which are made from carbon-supported platinum . Proton conduction through the phosphoric acid electrolyte occurs via the Grotthuss mechanism where protons are passed between phosphate tetrahedra via the formation and deformation of hydrogen bonds. , Although phosphoric acid fuel cells have been in use for decades, intermediate-temperature fuel cells can potentially be made more robust by adopting a solid-state electrolyte. , This is because liquid electrolytes must be monitored to prevent issues related to flooding and drying out, both of which would compromise fuel cell performance. ,, …”

Section: Introductionmentioning

confidence: 99%

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Site-Specific Proton Dynamics in Indium-Doped Tin Pyrophosphate

Foran

Goward

2020

J. Phys. Chem. C

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Tin pyrophosphates are solid-state materials that have been proposed for use as proton conductors in intermediate-temperature fuel cells. However, protons must be added synthetically as these materials do not contain structural protons. Protonation via indium doping results in two NMR-resolvable proton signals that correspond to hydrogen-bonded interstitial protons at phosphate tetrahedral and metal octahedral sites. These sites were assigned by using 1H NMR spectroscopy, allowing for site assignment based on the assumption that protons occupying the octahedral sites are more mobile. The full width at half-maximum and longitudinal relaxation were measured to assess proton mobility. Exchange spectroscopy showed that intersite proton exchange (needed for long-range proton transport) is enhanced by increased indium doping up to 20%. Activation energies calculated from proton exchange and proton conductivity measurements suggest that indium doping does not affect the mechanism of proton conduction in these materials: hopping between octahedral and tetrahedral sites. The increased proton conductivity is instead attributable to increased proton concentration.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Site-Specific Proton Dynamics in Indium-Doped Tin Pyrophosphate

Foran

Goward

2020

J. Phys. Chem. C

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“…However, to control these parameters in a hydrogen storage device and still have economically viable hydrogen storage efficiency is quite troublesome. One of the attempts to resolve this issue was done by Gervasio et al (2). They used ethylene glycol to increase sodium metaborate solubility, and found that by adding it the concentration of sodium borohydride solution in water can be increased by 50%, namely from 10%wt.…”

Section: Introductionmentioning

confidence: 99%

Portable Hydrogen Storage Based on New Chemistry of Sodium Borohydride

Stanić¹,

Braun²,

Pierce³

et al. 2008

ECS Trans.

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To overcome the problems of a current hydrogen storage technology, EnerFuel has invented a novel hydrogen system which produces hydrogen through a non water based chemical reaction of sodium borohydride. Based on the new chemistry, a portable hydrogen storage and generator device has 7.03 kWh total hydrogen content and can supply hydrogen at the rates required by 1 -60 W fuel cells. However, the simple system design allows for easy scaling up or down hydrogen content and flow rates to accommodate the hydrogen consumption. This specific storage is currently used to power a remote surveillance system, an EnerFuel product that demonstrates all the benefits of a hydrogen fuel cell technology. The storage operates at low pressure and in a wide temperature range from less than 0° to 80°C. A new storage is a safe and reliable supply of hydrogen where hydrogen is generated and present only when required by fuel cell. As a result of the advanced system design, it was possible to achieve high hydrogen storage capabilities: volumetric capacity 40.8 g/L, and gravimetric capacity 35.2 g/kg.

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Fuel Cells with Neat Proton‐Conducting Salt Electrolytes

Cited by 2 publications

References 19 publications

Site-Specific Proton Dynamics in Indium-Doped Tin Pyrophosphate

Site-Specific Proton Dynamics in Indium-Doped Tin Pyrophosphate

Portable Hydrogen Storage Based on New Chemistry of Sodium Borohydride

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