New Protonated Thioborate Glasses in the xH2S + (1 − x)B2S3 Series

Karthikeyan, A.; Martindale, Chad A.; Martin, Steve W.

doi:10.1021/jp0267095

Cited by 7 publications

(18 citation statements)

References 19 publications

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“…Also note that the current is three . 4 orders of magnitude lower than the .10 previous SnI2 sample. They were then heated to 280 'C at 1 °C/min.…”

Section: K/tcontrasting

confidence: 53%

Development of New Fast Proton Conducting Chalcogenide Glassy Electrolytes

Martin¹

2005

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SThe pubili reporting burden for this coilsotion of information is estimated to average 1 hour per responoe, including the time for reviewing instructions,, eworhing existing date soures., gtherun and mantanig the data needed, end completing and reviewin the coilection of information. Send cormlmets regarding this burden estmat or any other aspect of this aoiiection of iformaton, notding sug•m4gestons for reducig the rdenfe Ames, IA 50011-2300 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Office of A new research project was initiated to investigate whether high proton conductivity chalcogenide glasses could be prepared by doping base chalcogenide glasses, like glass B2S3 with a proton source, like H2S to yield proton conducting membranes for use in intermediate temperature proton exchange membrane fuel cells. While it will be shown below that indeed proton doped chalcogenide glasses could be prepared over wide ranges of compositions from a number of different base chalcogenide glasses, including B2S3, the proton conductivity for all of these glasses and in some cases polycrystals, was always quite low, rarely exceeding 10-5 (S/cm) at 100 oC. In addition, the proton doped glasses and ceramics exhibited limited thermal stability such that these materials thermally decomposed rapidly losing H2S, the proton source, above 100 oC and for this reason had very limited usefulness above l00oC. A new research project was initiated to investigate whether high proton conductivity chalcogenide glasses could be prepared by doping base chalcogenide glasses, like glass B 2 S3 with a proton source, like H 2 S to yield proton conducting membranes for use in intermediate temperature proton exchange membrane fuel cells. While it will be shown below that indeed proton doped chalcogenide glasses could be prepared over wide ranges of compositions from a number of different base chalcogenide glasses, including B 2 S 3 , the proton conductivity for all of these glasses and in some cases polycrystals, was always quite low, rarely exceeding 10-5 (S/cm) at 100 °C. In addition, the proton doped glasses and ceramics exhibited limited thermal stability such that these materials thermally decomposed rapidly losing H 2 S, the proton source, above 100 TC and for this reason had very limited usefulness above 100°C. IS. SUBJECTProtonated thioborate phases were successfully prepared by reacting vitreous B 2 S 3 (v-B 2 S 3 ) with H 2 S. This reaction yielded polycrystalline meta-thioboric acid (HB-S 2 ) 3 as vapor condensates.

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“…Also note that the current is three . 4 orders of magnitude lower than the .10 previous SnI2 sample. They were then heated to 280 'C at 1 °C/min.…”

Section: K/tcontrasting

confidence: 53%

Development of New Fast Proton Conducting Chalcogenide Glassy Electrolytes

Martin¹

2005

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“…The physical properties of some of these glasses have been reported earlier in detail [7][8][9]. The density of glassy B 2 S 3 is 1.71 g/cm 3 and protonation or H 2 S modification of the B 2 S 3 network did not lead to any significant changes in the density.…”

Section: Densitymentioning

confidence: 78%

“…The sealed tube was then slowly heated to about 300-600°C, depending on composition of the mix and its melting temperature, and held there for an hour [7]. The tube was then quenched using a cold-water bath to form the glassy phase.…”

Section: Methodsmentioning

confidence: 99%

“…The thiogermanate vibrational modes are observed in the far-infrared region and their structure is composed of tetrahedral GeS 4/2 units. The increase in glass transition temperature and the glass formation ability in this system are due to the higher stability of the thiogermanate structural units and an additional linkage (4 versus 3) provided by the tetrahedral units [8]. These tetrahedral units are connected to bridging sulfur atoms in trigonal borate units or rings.…”

Section: H 2 S + B 2 S 3 + Ges 2 Systemmentioning

confidence: 95%

“…The IR spectra of the reference precursor and the base glass (v-B 2 S 3 ) are also shown in these figures for comparison. The assignments of various vibrational modes of the glassy and ceramic samples in binary system H 2 S + B 2 S 3 and its structure has been analyzed in detail and reported earlier [7]. Structures of the borate network in other ternary systems studied here were made based on the structural details reported earlier.…”

Section: Structurementioning

confidence: 99%

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