Catalysis and proton-conduction of novel phosphate glasses

Mizusaki, S.; Toyoda, Yoshiaki; Nakayama, Kouji; Nagata, Y.; Ozawa, Tadashi C.; Noro, Yusuke; Samata, H.

doi:10.1016/j.jnoncrysol.2009.04.012

Cited by 14 publications

(3 citation statements)

References 10 publications

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“…Mizusaki et al [110] reported in 2009 on the performance of novel phosphate materials as catalysts for water decomposition and as proton conductors. These materials were based on Nb and W doped phosphates having a general composition of 30Na 2 O-10BaO-30P 2 O 5 -(30 − x)WO 3 -xNb 2 O 5 where x ranges from 5 to 25.…”

Section: Other Types Of Phosphate Based Electrolytesmentioning

confidence: 99%

A review on phosphate based, solid state, protonic conductors for intermediate temperature fuel cells

Paschos¹,

Kunze²,

Stimming³

et al. 2011

J. Phys.: Condens. Matter

121

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The electrolytes currently used for proton exchange membrane fuel cells are mainly based on polymers such as Nafion which limits the operation regime of the cell to ∼80 °C. Solid oxide fuel cells operate at much elevated temperatures compared to proton exchange membrane fuel cells (∼1000 °C) and employ oxide electrolytes such as yttrium stabilized zirconia and gadolinium doped ceria. So far an intermediate temperature operation regime (300 °C) has not been widely explored which would open new pathways for novel fuel cell systems. In this review we summarize the potential use of phosphate compounds as electrolytes for intermediate temperature fuel cells. Various examples on ammonium polyphosphate, pyrophosphate, cesium phosphate and other phosphate based electrolytes are presented and their preparation methods, conduction mechanism and conductivity values are demonstrated.

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Section: Other Types Of Phosphate Based Electrolytesmentioning

confidence: 99%

A review on phosphate based, solid state, protonic conductors for intermediate temperature fuel cells

Paschos¹,

Kunze²,

Stimming³

et al. 2011

J. Phys.: Condens. Matter

121

View full text Add to dashboard Cite

show abstract

“…As is known, the primary way for water incorporation into the network of phosphate glass is formation of P-OH groups, similar to alkali-metal oxide modifiers, resulting in depolymerization of structural network [54,55]. The structural -OH species in 45RH, 65RH and 85RH samples are stable and maintain a sufficient interlayer spacing to allow the diffusion of Li + ions over multiple cycles [56]. This is the main reason for the improved electrochemical performances.…”

Section: Electrochemical Performancesmentioning

confidence: 99%

Water Boosts the Performances of Glass Anodes for Lithium-Ion Batteries

Jiang

Gao

et al. 2021

Preprint

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Owing to their disordered open network structure, oxide glasses are a promising class of anode materials for Lithium-Ion Batteries (LIBs). However, the relatively low capacities of glass anodes severely limit their practical application for large energy storage devices. Here we show an unconventional novel approach, which significantly enhances the electrochemical performances of glass anodes for LIBs. Specifically, we incorporated water into an electrochemically active glass system, i.e., TeO2-V2O5-P2O5 (TVP) glass powder via humidity treatment, and then mix the hydrated powder with additives to fabricate anode. The optimized humidity treatment led to the structural modification of the TVP glass powder, which boosted the capacity of the TVP anode by more than 200%, and maintained the reversible capacity for extra-long cycles. The boosted performances are associated both with the depolymerized structural network for Li+ diffusion and with the hydration-induced nanocrystals. These findings help develop superior glass electrodes in an economically effective way.

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“…Several studies on electrical conductivity and proton diffusion of alkali tungsten phosphate glasses have been reported since Tawarayama et al reported that hydrogen dissolved into alkali tungsten phosphate glass. [12][13][14][15][16] However, both protons and alkali ions existed in the glasses because extraction process of alkali ions was not given in these studies. Here, we report a new electrochemical substitution technique that allows protons to be introduced into host oxides by substituting alkali ions in the precursor materials at high temperature above 250 • C. The substitution process is carried out by heating the sodium tungsten phosphate glass under hydrogen partial pressure with temperatures similar to the IT-FC operation that ensures the stable dissolution of the protons.…”

mentioning

confidence: 99%

Electrochemical Substitution of Sodium Ions in Tungsten Phosphate Glass with Protons

Ishiyama¹,

Suzuki²,

Nishii³

et al. 2013

J. Electrochem. Soc.

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A novel technique was developed to inject proton carriers into phosphate glass. Sodium ions in the sodium tungsten phosphate glass were electrochemically substituted with protons. A glass plate with a deposited Pd anode was placed on the molten tin cathode and heated at a temperature below glass transition temperature under DC-bias in hydrogen containing atmosphere. Protons were injected from the palladium anode and substituted the sodium ions in the glass. The sodium ions migrated to the cathode and discharged to the molten tin cathode by capturing an electron from the external circuit. The atomic sodium dissolved into the cathode and reacted with CO2 impurities in the atmosphere resulting deposition of sodium carbonate on the tin cathode surface. After almost all of the sodium ions were discharged from the glass, the proton concentration in the glass reached 4.3 × 1021 cm−3. The proton conductivity was found to be 1 × 10−3 Scm−1 at 350°C. The injected protons were stable at temperatures below 400°C. The glass obtained by this technique behaves as a mixed conductor of protons and electrons with a proton transport number of 0.30. A possible means to suppress the electronic conductivity was discussed.

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Catalysis and proton-conduction of novel phosphate glasses

Cited by 14 publications

References 10 publications

A review on phosphate based, solid state, protonic conductors for intermediate temperature fuel cells

A review on phosphate based, solid state, protonic conductors for intermediate temperature fuel cells

Water Boosts the Performances of Glass Anodes for Lithium-Ion Batteries

Electrochemical Substitution of Sodium Ions in Tungsten Phosphate Glass with Protons

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