Oxyhydrides of (Ca,Sr,Ba)TiO3 Perovskite Solid Solutions

Sakaguchi, Tatsunori; Kobayashi, Yoji; Yajima, Takeshi; Ohkura, Masatoshi; Tassel, Cédric; Takeiri, Fumitaka; Mitsuoka, S; Ohkubo, Hiroshi; Yamamoto, Takafumi; Kim, Jung Eun; Tsuji, Naruki; Fujihara, Akihiko; Matsushita, Yoshitaka; Hester, James; Avdeev, Maxim; Ohoyama, Kenji; Kageyama, Hiroshi

doi:10.1021/ic300859n

Cited by 88 publications

(128 citation statements)

References 23 publications

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“…Further, at its peak, this leak rate exceeded that of the next largest point source in the United States-an underground coal mine in Alabama-by over a factor of 2 (14) and was a factor of 10 larger than the CH 4 leak rate reported from the Total Elgin rig blowout in the North Sea in 2012 (17). The Aliso Canyon CH 4 leak rates were comparable to the total CH 4 emission rates of entire oil and gas production regions in the United States [e.g., the Barnett shale, 76 metric tons per hour (18); the Haynesville shale, 80 metric tons per hour (19); the Fayetteville shale, 39 metric tons per hour (19); and the northeastern Marcellus shale, 15 metric tons per hour (19)].…”

Section: Supplementary Materialsmentioning

confidence: 76%

“…Biochemical studies confirmed that this abstraction in NosL is the first step in the conversion of L-tryptophan into MIA. NosL can perform b-scissions from the amino-centered radical intermediate at either Ca-Cb or Ca-C when using L-tryptophan analogs (17,18). These observations suggest a relative propensity of NosL for substrate promiscuity that, combined with slight differences in…”

Section: Acknowledgmentsmentioning

confidence: 99%

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Methane emissions from the 2015 Aliso Canyon blowout in Los Angeles, CA

Conley

Franco

Faloona

et al. 2016

Science

225

223

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Single-point failures of natural gas infrastructure can hamper methane emission control strategies designed to mitigate climate change. The 23 October 2015 blowout of a well connected to the Aliso Canyon underground storage facility in California resulted in a massive release of natural gas. Analysis of methane and ethane data from dozens of plume transects, collected during 13 research-aircraft flights between 7 November 2015 and 13 February 2016, shows atmospheric leak rates of up to 60 metric tons of methane and 4.5 metric tons of ethane per hour. At its peak, this blowout effectively doubled the methane emission rate of the entire Los Angeles basin and, in total, released 97,100 metric tons of methane to the atmosphere.

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Section: Supplementary Materialsmentioning

confidence: 76%

Section: Acknowledgmentsmentioning

confidence: 99%

Methane emissions from the 2015 Aliso Canyon blowout in Los Angeles, CA

Conley

Franco

Faloona

et al. 2016

Science

225

223

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“…However, the preparation of oxyhydrides is mainly required special synthesis conditions such as a solid state reaction at high-pressure [6][7][8] or a strong reducing reaction using metal hydrides as the reductant. [9][10][11][12][13] Although the synthesis of the LSLHO system by a conventional solid-state reaction at ambient pressure has been reported, it is only suitable for a standard composition of La 2 LiHO 3 , which contains the lowest concentration of H ¹ in this system. 14 ¹ and (LaSrO 2 ) + layers along the c-axis (Fig.…”

Section: ¹mentioning

confidence: 99%

Ambient Pressure Synthesis and H− Conductivity of LaSrLiH2O2

et al. 2017

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Recently, hydride ion (H −) has come to be recognized as new charge carrier for the transport of hydrogen in solids by realization of pure H − conduction in BaH 2 and La 2−x−y Sr x+y LiH 1−x+y O 3−y oxyhydride system (LSLHO). In this study, the H − conductive oxyhydride, LaSrLiH 2 O 2 (x = 0, y = 1 in LSLHO), was synthesized by a conventional solidstate reaction at ambient pressure. The crystal structure of LaSrLiH 2 O 2 , as well as the H − conductivity and bonding state of hydrogen, was examined by Rietveld analysis using X-ray and neutron diffraction data, attenuated total reflection Fourier transform spectroscopy (ATR-FTIR), and electrochemical impedance spectroscopy (EIS). The sample synthesized at ambient pressure had a K 2 NiF 4 -type layered perovskite structure composed of alternately stacked tetragonal (LiH 2 ) − and (LaSrO 2 ) + layers, and exhibited a conductivity of H − of 3.2 × 10 −6 S cm −1 at 300°C, which were the same structure and property as that reported previously for a sample synthesized by high-pressure synthesis.

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“…59 Oxyhydride solid solutions (Ca,Sr)TiO 3¹x H x and (Sr,Ba)TiO 3¹x H x are prepared from corresponding ATiO 3 oxides. 61 Unlike the cobalt-based oxyhydride, BaTiO 3¹x H x has a common valence of Ti 3+/4+ , as seen in the Magnéli phases Ti n O 2n¹1 (n = integer), 64 and is electronically conducting. Furthermore, the hydride species is exchangeable with hydrogen gas at moderate temperatures.…”

Section: ç Transition Metal Oxyhydridesmentioning

confidence: 99%

Hydride Reductions of Transition Metal Oxides

Yamamoto

Kageyama

2013

Chemistry Letters

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Low-temperature reactions are a powerful approach to generate new transition metal oxides that are inaccessible by conventional high-temperature reactions. In this review, we describe the recent progress of the topochemical reduction method using metal hydrides for transition metal oxides, in particular, focusing on structural modifications (relations), chemical and physical properties, and the factors that direct selective and rational preparations. The hydride reduction has been so far extensively applied to 3d transition metal perovskite oxides, yielding highly reduced products with unusual coordination environment (e.g., FeO 4 square-planar coordination), and extremely low-valent metal centers (e.g., Mn(I) and Co(I)). Non-perovskite oxides like pyrochlore and hexagonal perovskite can be also reduced. Moreover, this method allows access to oxyhydride materials (LaSrCoO 3 H 0.7 and BaTiO 3¹x H x ) that are promising for use as hydride ion conductors. Morphology-controlled oxides (thin film-and nano-oxides) are useful targets for hydride reduction, opening new possibilities for extending functions. Ç IntroductionTransition metal (TM) oxides like spinel and perovskite oxides represent a variety of exotic and useful chemical and physical properties that include magnetoresistance, multiferroics, superconductivity, photocatalysis, thermoelectricity, and so on.17 These properties are closely related to the valence, spinstate, coordination of transition metal centers, and how they are connected to form an extended network. In order to achieve improved or new properties, cation chemistry has been often executed. For example, tuning the MnOMn bridging angle in LaMnO 3 by rare-earth substitution induces a large multiferroic responce.8 However, conventional solid-state synthesis at high temperature produces only thermodynamically stable products and permits limited access to structural modifications.Low-temperature reactions have attracted recent attention owing to its kinetics-driven nature, providing, in principle, rational and predictable design of structures and compositions as a metastable product. Ion-exchange reaction is such a process, which is found in minerals (e.g., clay), and is also of technological and industrial importance since nearly a century ago. Intercalation (deintercalation) reactions involve reactive species to be inserted into (extracted from) a host compound. The important feature in these soft chemical reactions is that the structural framework remains unchanged when comparing the starting and final compounds during the reaction. Therefore, if a suitable reaction condition (precursor material, reactant, temperature, etc.) is chosen, one may obtain a desired structure and composition with novel functionalities.TM perovskite ABO 3 oxides (Figure 1a) have high tolerance to oxygen deficiency (ABO 3¹¤ ), as found in SrFeO 3¹¤ and LaNiO 3¹¤ . 11,12 Increase of the oxygen content in the perovskiterelated cuprate YBa 2 Cu 3 O 7¹¤ (0¯¤¯1) gives rise to drastic change in the ground states, from ...

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Oxyhydrides of (Ca,Sr,Ba)TiO₃ Perovskite Solid Solutions

Cited by 88 publications

References 23 publications

Methane emissions from the 2015 Aliso Canyon blowout in Los Angeles, CA

Methane emissions from the 2015 Aliso Canyon blowout in Los Angeles, CA

Ambient Pressure Synthesis and H<sup>−</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>

Hydride Reductions of Transition Metal Oxides

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Oxyhydrides of (Ca,Sr,Ba)TiO3 Perovskite Solid Solutions

Cited by 88 publications

References 23 publications

Methane emissions from the 2015 Aliso Canyon blowout in Los Angeles, CA

Methane emissions from the 2015 Aliso Canyon blowout in Los Angeles, CA

Ambient Pressure Synthesis and H<sup>&minus;</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>

Hydride Reductions of Transition Metal Oxides

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Oxyhydrides of (Ca,Sr,Ba)TiO₃ Perovskite Solid Solutions

Ambient Pressure Synthesis and H<sup>−</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>