Enhancement of the conductivity of Ba2In2O5 through phosphate doping

Shin, Jongmoon; Hussey, Laura; Orera, Alodia; Slater, Peter R.

doi:10.1039/c0cc00063a

Cited by 46 publications

(36 citation statements)

References 24 publications

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“…In particular, we have shown that the partial substitution of these oxyanions at the In/Sc site in Ba 2 (In/Sc) 2 O 5 leads to the introduction of disorder on the oxygen sublattice and a corresponding enhancement in the low temperature ionic conductivity [14][15][16][17][18]. In terms of electronic conducting materials, we have also reported the successful incorporation of silicate, phosphate and sulphate into SrMO 3 (M = Co, Mn), leading to a large enhancement in the electronic conductivity [19,20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of oxyanion-doped manganites for potential application as SOFC cathodes

et al. 2012

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In this paper we report the successful incorporation of borate and phosphate into CaMnO 3 and borate into La 1Ày Sr y MnO 3Àd . For CaMnO 3 , an increase in the electronic conductivity was observed, which can be correlated with electron doping due to the oxyanion doping favoring the introduction of oxide ion vacancies (as well as the higher valence of P 5+ compared to Mn 4+ in the case of phosphate doping). The highest conductivity at 800 C was observed for CaMn 0.95 P 0.05 O 3Àd , 43.0 S cm À1 , in comparison with 7.6 S cm À1 for undoped CaMnO 3 at the same temperature. For La 1Ày Sr y MnO 3Àd the conductivity suffers a decrease for all compositions on borate doping, attributed to a reduction in the hole (Mn 4+ ) concentration. In order to investigate the potential of these materials as SOFC cathodes, the chemical compatibility with Gd 0.1 Ce 0.9 O 1.95 (CGO10) has also been investigated. For the calcium manganites, the lowest temperature examined without reaction was 900 C, with minor amounts of Ca 4 Mn 3 O 10 observed at 1000 C. Composites of these cathode materials with 50% CGO10 were examined on dense CGO10 pellets and the area specific resistances (ASR) in symmetrical cells were determined. The ASR values, at 800 C, were 1.50, 0.37 and 0.30 U$cm 2 for CaMnO 3 , CaMn 0.95 B 0.05 O 3Àd and CaMn 0.95 P 0.05 O 3Àd , respectively. For the lanthanum strontium manganites, the B-doped compositions showed an improvement in the ASR values with respect to the parent compounds, despite the lower electronic conductivity. This may be due to an increase in ionic conductivity due to borate incorporation leading to the formation of oxide ion vacancies. Thus these preliminary results show that oxyanion doping has a beneficial effect on the performance of perovskite manganite cathode materials, and suggests that this doping strategy warrants further investigation in other perovskite cathode systems.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of oxyanion-doped manganites for potential application as SOFC cathodes

et al. 2012

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“…Recently we have extended such studies to demonstrate potential applications for modifying fuel cell electrolyte materials. In this recent work we showed that for Ba 2 In 2 O 5 , the partial substitution of oxyanions at the In site led to the introduction of disorder on the oxygen sublattice and an increase in cell symmetry to cubic, coupled with a corresponding enhancement in the low temperature conductivity [12][13][14]. Of the three oxyanions (sulphate, phosphate, and silicate) investigated, silicate incorporation was shown to give samples with the highest conductivities [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of silicon doped SrMO3 (M = Mn, Co): stabilization of the cubic perovskite and enhancement in conductivity

Hancock

Slater

2011

Dalton Trans.

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In this paper we report the successful incorporation of silicon into SrMO 3 (M=Co, Mn) leading to a structural change from a hexagonal to a cubic perovskite. For M=Co, the cubic phase was observed for low doping levels (3%), and these doped phases showed very high conductivities ( up to ≈350 Scm -1 at room temperature For M=Mn, the work showed that higher substitution levels were required to form the cubic perovskite (≈15% Si doping), although in these cases the phases were shown to be stable to annealing at intermediate temperatures. Conductivity measurements again showed an enhancement in the conductivity on Si doping, although the conductivities were lower (≈0.3 -14 Scm -1 in the range 20-800 ○ C) than the cobalt containing systems.The conductivities of both systems suggest potential for use as cathode materials in solid oxide fuel cells.

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“…The conductivity values offered by the Ba 2 In 1.8 S 0.2 O 5+δ material in Fig.4 are higher than that shown for the base Ba 2 In 2 O 5 material in the literature 10,24 , underscoring the beneficial nature of oxygen disorder upon sulfur(VI) doping. The exothermic enthalpy of Eq.…”

Section: Electrical Transport Properties Of Ba 2 In 18 S 02 O 5+δmentioning

confidence: 59%

“…Although the β-phase is considered an excellent proton conductor, its use in electrochemical devices could not be recommended, due to substantial volume changes during the phase transition 12,14,15 . The addition of lanthanum in Ba 2-x La x In 2 O 5 lowered T d until the disordered high temperature phase was finally stabilised to room temperature in compositions with values of x > 0.1 18,19 [24][25][26][27] doping in the B-site favour anionic disorder and simultaneously increase the oxide-ion conductivity at lower temperatures and proton conductivity under humid conditions. The main objective is to stabilize the high temperature phase, of oxygen vacancy disorder, to lower temperatures to promote high levels of proton or oxide-ion conductivity.…”

Section: Introductionmentioning

confidence: 99%

Exploring the mixed transport properties of sulfur(vi)-doped Ba₂In₂O₅ for intermediate-temperature electrochemical applications

et al. 2016

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Thestabilised orthorhombic perovskite Ba2In1.8S0.2O5.3 was synthesised by solid state reaction at low-temperature. The mixed (electronic-protonic-oxide-ionic) conducting properties of this composition were investigated in detail for potential interest in a wide range of membrane applications including Protonic Ceramic Fuel Cells. The electrochemical analyses performed include impedance spectroscopy in wet/dry conditions of N2 and O2 and modified electromotive force measurements in wet/dry mixtures of N2/O2. In dry oxidising conditions the sample possesses mixed electronic-oxide-ionic contributions to the electrical transport in the whole range of temperature, associated with the equilibrium between oxygen vacancies and holes. In wet atmospheres, protonic species arise from the hydration reaction. Protons represent the dominant charge carriers for temperatures lower than 550 °C, while oxide-ions and holes are the major mobile species for temperatures higher than 700 °C. Appreciable mixed contributions to the electrical transport from protons, oxide ions and holes are confirmed between 550-700 °C. The experimental data obtained from modified electromotive force measurements and impedance spectroscopy fit well with the expected results according to the proposed defect chemistry model.

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Enhancement of the conductivity of Ba2In2O5 through phosphate doping

Cited by 46 publications

References 24 publications

Synthesis and characterisation of oxyanion-doped manganites for potential application as SOFC cathodes

Synthesis and characterisation of oxyanion-doped manganites for potential application as SOFC cathodes

Synthesis of silicon doped SrMO3 (M = Mn, Co): stabilization of the cubic perovskite and enhancement in conductivity

Exploring the mixed transport properties of sulfur(vi)-doped Ba₂In₂O₅ for intermediate-temperature electrochemical applications

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Enhancement of the conductivity of Ba2In2O5 through phosphate doping

Cited by 46 publications

References 24 publications

Synthesis and characterisation of oxyanion-doped manganites for potential application as SOFC cathodes

Synthesis and characterisation of oxyanion-doped manganites for potential application as SOFC cathodes

Synthesis of silicon doped SrMO3 (M = Mn, Co): stabilization of the cubic perovskite and enhancement in conductivity

Exploring the mixed transport properties of sulfur(vi)-doped Ba2In2O5 for intermediate-temperature electrochemical applications

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Exploring the mixed transport properties of sulfur(vi)-doped Ba₂In₂O₅ for intermediate-temperature electrochemical applications