Electrical Properties of p-Type Electronic Defects in the Protonic Conductor SrCe[sub 0.95]Eu[sub 0.05]O[sub 3−δ]

Song, Sun-Ju; Wachsman, Eric D.; Dorris, S. E.; Balachandran, U.

doi:10.1149/1.1574031

Cited by 67 publications

(69 citation statements)

References 22 publications

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“…Because this reaction is exothermic [12,30], proton conduction dominates at low temperatures. At elevated temperatures, where water desorption is favored [31], electronic (p-type) or oxygen-ion conductivity increases [32][33][34][35][36][37]. The temperature at which dehydration starts depends on the HTPC composition.…”

Section: High-temperature Proton Conductor Electrolytes For It-sofc Amentioning

confidence: 99%

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

131

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High temperature proton conductor (HTPC) oxides are attracting extensive attention as electrolyte materials alternative to oxygen-ion conductors for use in solid oxide fuel cells (SOFCs) operating at intermediate temperatures (400-700• C). The need to lower the operating temperature is dictated by cost reduction for SOFC pervasive use. The major stake for the deployment of this technology is the availability of electrodes able to limit polarization losses at the reduced operation temperature. This review aims to comprehensively describe the state-of-the-art anode and cathode materials that have so far been tested with HTPC oxide electrolytes, offering guidelines and possible strategies to speed up the development of protonic SOFCs.

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Section: High-temperature Proton Conductor Electrolytes For It-sofc Amentioning

confidence: 99%

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

131

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“…9 [15]. Figure 2 shows the measured and calculated conductivities as a function of hydrogen partial pressure (P H 2 O ¼ 0:03 atm) at 600°C.…”

Section: Resultsmentioning

confidence: 99%

Fast proton conduction path in % MathType!Translator!2!1!AMS LaTeX.tdl!TeX -- AMS-LaTeX! % MathType!MTEF!2!1!+- % feaaeaart1ev0aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX % garmWu51MyVXgatuuDJXwAK1uy0HwmaeHbfv3ySLgzG0uy0Hgip5wz % aebbnrfifHhDYfgasaacH8qrps0lbbf9q8WrFfeuY-Hhbbf9v8qqaq % Fr0xc9pk0xbba9q8WqFfea0-yr0RYxir-Jbba9q8aq0-yq-He9q8qq % Q8frFve9Fve9Ff0dmeaabaqaciGacaGaaeqabaWaaeWaeaaakeaaca % qGobGaaeyAaiabgkHiTiaabkeacaqGHbGaae4qaiaabwgadaWgaaWc % baGaaGimaiaac6cacaaI4aaabeaakiaabMfadaWgaaWcbaGaaGimai

Song

Park

Dorris

et al. 2007

Ionics

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The effect of metal-to-oxide grain boundary layer in Ni À BaCe 0:8 Y 0:2 O 3Àd (BCY) cermet membrane on hydrogen permeation was studied by applying the different size of oxide grain on Ni-BCY membranes. Two types of cermet membranes having different grain size of oxide were prepared by using different starting particle size of oxide powder. The hydrogen flux of coarse-oxide-grain membrane showed higher flux than that of small-oxide-grain membrane. It was understood that the negative potential at metal-to-oxide grain boundary, reference to the bulk oxide (φ 0 < φ 1 ¼ 0), was developed, and the accumulation of the effectively positively charged protons may occur at the grain boundary layer (space charge layer), which may result in providing highly conductive proton path by shifting the charge neutrality condition from OH

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“…21 have been confirmed with other experimental observations. For example, electron-hole conduction becomes predominant with decreasing hydrogen partial pressure [86][87][88], while oxygen vacancies become predominant at lower oxygen partial pressure [88][89][90]. As would be expected from the combination of these two trends, proton conduction is favored by wet conditions, while oxygen vacancies are favored in dry conditions [91,92].…”

Section: Hydrogen Sensormentioning

confidence: 99%

Solid-state electrochemical gas sensors

Park

Fergus

Miura

et al. 2009

Ionics

136

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The solid-state electrochemical principle has been a selective and accurate way of sensing chemical components in various environments, including liquid metal, for an extended period of time. Since after Carl Wagner's interpretation of zirconia, there appeared many advances in chemical sensor applications. The electrochemical techniques for the chemical measurements have, in general, several major advantages compared to other methods. The information of interest is directly converted into electrical signal which may be employed in electronic circuits. Electrochemical measurements are always selective for the quantities that undergo the electrochemical redox reaction. In most cases, reactions at equilibrium are considered, but techniques have also been developed to be able to use kinetic limit. Furthermore, the signal is independent of materials properties, such as the ionic conductivity or impurity as long as it is a predominant ionic conductor. Depending on the type of application, voltage or current measurements are employed. While potentiometric method commonly allows measuring chemical species over a wide range of concentration, amperometric sensors generally cover a quite limited range but have a much higher resolution. In this paper, various principles of electrochemical techniques to measure the chemical quantities are introduced. And there are many examples of the status of researches on electrochemical sensors, such as oxygen sensor, carbon dioxide sensor, NO x sensor, SO x sensor, and hydrogen sensor.

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Electrical Properties of p-Type Electronic Defects in the Protonic Conductor SrCe[sub 0.95]Eu[sub 0.05]O[sub 3−δ]

Cited by 67 publications

References 22 publications

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Solid-state electrochemical gas sensors

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