Nanoprotonics in perovsikte-type oxides: Reversible changes in color and ion conductivity due to nanoionics phenomenon in platinum-containing perovskite oxide

Matsumoto, Hiroshige; Tanji, Takayoshi; Amezawa, Koji; Kawada, Tatsuya; Uchimoto, Yoshiharu; Furuya, Yoshihisa; Sakai, Takaaki; Matsuka, Maki; Ishihara, Tatsumi

doi:10.1016/j.ssi.2010.11.016

Cited by 16 publications

(15 citation statements)

References 23 publications

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“…The potential of nanoionics to create a super-ionic composite conductor represents a particularly fascinating and practical application. This can be created by engineering an ionic composite with appropriately spaced metal nanoparticles (NPs) to create a percolating space charge region that acts as a fast pathway for ion conduction [7][8][9][10][11]. One key issue with this approach is the need to prevent agglomeration of the metal NPs during the processing of the super-ionic composite.…”

Section: Introductionmentioning

confidence: 99%

Conduction electron resonance used to determine size of palladium nanoparticles in proton conducting ceramics

Simonds

Subramaniyan

O’Hayre

et al. 2012

Journal of Magnetic Resonance

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Section: Introductionmentioning

confidence: 99%

Conduction electron resonance used to determine size of palladium nanoparticles in proton conducting ceramics

Simonds

Subramaniyan

O’Hayre

et al. 2012

Journal of Magnetic Resonance

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“…3 In recent years, reversible movements of noble-metal nanoparticles into and out of perovskite structures have been found, and subsequent unique functions have been reported, such as self-regenerative catalysts 4 and nanoionic phenomena. 5 In a previous paper, we reported a new preparation route for Pt-containing perovskite-type oxides, (La 0.7 Sr 0.2 Ba 0.1 )(Sc,Pt)-O 3¹¤ (where ¤ denotes the quantity of oxygen vacancies). 6 In this route, Pt-containing perovskites can be prepared just by putting a perovskite oxide, e.g., (La 0.7 Sr 0.2 Ba 0.1 )ScO 3¹¤ (LSBS) powder on Pt foil and then firing at high temperatures in air.…”

mentioning

confidence: 99%

Chemical Reactivities of LaScO3-based Perovskite Oxides and Platinum

Nomura¹,

Kageyama²,

Ohmi³

et al. 2013

Chemistry Letters

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We investigated the chemical reactivities of (La 0.7 Sr 0.2 -Ba 0.1 )ScO 3¹¤ (LSBS) and LaScO 3 powders and Pt foil as functions of reaction temperature, T, oxygen partial pressure, P(O 2 ), and reaction time, t. The LSBS powder showed a maximal Pt content of ca. 33 mg (ca. 3 wt %) under the conditions T = 1573 K, P(O 2 ) = 0.21 atm (in air), and t = 10 h. Subsequent heat treatment at 1773 K in air for 10 h resulted in the deposition of Pt fine particles (1.7 mg) on the LSBS powder and a weight gain of the Pt foil (4.3 mg). 3 In recent years, reversible movements of noble-metal nanoparticles into and out of perovskite structures have been found, and subsequent unique functions have been reported, such as self-regenerative catalysts 4 and nanoionic phenomena. 5In a previous paper, we reported a new preparation route for Pt-containing perovskite-type oxides, (La 0.7 Sr 0.2 Ba 0.1 )(Sc,Pt)-O 3¹¤ (where ¤ denotes the quantity of oxygen vacancies). 6 In this route, Pt-containing perovskites can be prepared just by putting a perovskite oxide, e.g., (La 0.7 Sr 0.2 Ba 0.1 )ScO 3¹¤ (LSBS) powder on Pt foil and then firing at high temperatures in air. LSBS is an LaScO 3 -based perovskite oxide and contains aliovalent cations (20 mol % Sr 2+ and 10 mol % Ba 2+ ions) in La 3+ ion sites. 7 This aliovalent cation doping results in the formation of oxygen vacancies (¤ = 0.15 in LSBS) and subsequent mixed (i.e., proton, oxide ion, and hole) conduction. We have also reported that perovskite-type oxides, LSBS, Sr(Zr 0.9 Y 0.1 )O 3¹¤ , etc. react not only with Pt but also with the other noble metals, Rh, Ir, Ru, etc. 8,9 In addition, X-ray absorption fine structure (XAFS) analysis revealed that the noble metals (Ir, Pd, Pt, Rh, and Ru) occluded in LSBS exist not in a metallic but rather in an ionic state and that they are mainly introduced into ScO 6 octahedral sites.10 Surprisingly, the chemical reactions between perovskite-type oxides and noble metals can proceed through air, i.e., under noncontact conditions of perovskite-type oxides and noble metals. (3N) for LS, was repeatedly planetary-ball-milled, calcined at 1623 K for 10 h in air, and then finally fired at 1873 K for 10 h in air. The LSBS and LS powders thus obtained were ground to submicron powders. The LSBS or LS powder (1.000 g) placed on Pt foil (99.98%, thickness: 30¯m) in an alumina container (volume ca. 15 cm 3 ) with a cover of the same material was fired under different conditions as follows: T from 1273 to 1873 K, P(O 2 ) from 4.0 © 10 ¹4 to 1.0 atm, t from 5 to 160 h. Before and after firing, the LSBS powder and Pt foil were weighed on a balance. The chemical compositions of the LSBS powder before and after firing were determined using inductively coupled plasma atomic emission spectrometry (ICP-AES; Jarelash IRIS Advantage). The crystal structures of LSBS powder before and after firing were investigated by X-ray diffraction (XRD; Cu K¡ radiation, PANalytical X'Pert Pro) analysis. Figure 1 shows the T dependence of the weight loss of the Pt foil and the Pt co...

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“…Protons in these oxides will be in equilibrium with holes and electrons, and the oxides are expected to have different characteristics at hetero-interfaces where space charges are generated and affect these defect equilibria [81][82][83][84][85][86]. H + is the only ion of chemical significance that does not have an electron shell of its own.…”

Section: Mechanism Of Proton and Oxide Ion Conductorsmentioning

confidence: 99%

Review on nanoperovskites: materials, synthesis, and applications for proton and oxide ion conductivity

Madhavan

Ashok

2014

Ionics

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Perovskite materials exhibiting proton and oxide ion conductivities have been utilized for various energyrelated applications such as solid oxide fuel cells (SOFCs), hydrogen production, gas sensors, etc. Nowadays, perovskites are being synthesized as nanoperovskites and studied for catalytic activity and energy-related applications. In this article, their synthesis in brief, the mechanism of proton and oxide ion conduction, and some specific properties and behaviors of few nanoperovskites as oxide ion and proton conductors and applications have been reported and discussed.

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Nanoprotonics in perovsikte-type oxides: Reversible changes in color and ion conductivity due to nanoionics phenomenon in platinum-containing perovskite oxide

Cited by 16 publications

References 23 publications

Conduction electron resonance used to determine size of palladium nanoparticles in proton conducting ceramics

Conduction electron resonance used to determine size of palladium nanoparticles in proton conducting ceramics

Chemical Reactivities of LaScO3-based Perovskite Oxides and Platinum

Review on nanoperovskites: materials, synthesis, and applications for proton and oxide ion conductivity

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