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Journal Articles

Oxygen reduction activity and interfacial structures of La $_{0.8}$ Sr $_{0.2}$ CoO $_{3}$ at initial electrochemical process in an alkaline solution

Matsuzaki, Akira*; Hirayama, Masaaki*; Oguchi, Shoya*; Komo, Mamoru*; Ikezawa, Atsunori*; Suzuki, Kota*; Tamura, Kazuhisa; Arai, Hajime*; Kanno, Ryoji*

Electrochemistry (Internet), 90(10), p.107001_1 - 107001_8, 2022/10

https://doi.org/10.5796/electrochemistry.22-00079

Times Cited Count：0 Percentile：0.01(Electrochemistry)

Oxygen reduction and evolution reactions (ORR and OER) of perovskite-type La $_{0.8}$ Sr $_{0.2}$ CoO $_{3}$ were characterized using two-dimensional model electrodes with different reaction planes. Synthesized by pulsed laser deposition, these thin and flat electrodes can reveal the reaction plane dependence of the ORR activity. From steady-state polarization measurements in KOH (aq.), the ORR activity was the highest on the (001) film during the first ORR/OER cycle, and it decreased significantly during the second cycle. In-situ synchrotron X-ray diffraction clarified crystal structure changes in the bulk and surface regions of La $_{0.8}$ Sr $_{0.2}$ CoO $_{3}$ , and these changes are associated with forming oxygen defects during the initial electrochemical process. Furthermore, the La $_{0.8}$ Sr $_{0.2}$ CoO $_{3}$ surface partially decomposed upon reacting. Therefore, the interfacial structures formed in the electrochemical reaction field is important for enhancing ORR and OER activities.

Journal Articles

Influences of hydration-dehydration on local structure in layered perovskite LaSr $_{3}$ Fe $_{3}$ O $_{10}$

Yagi, Yutaro*; Wakita, Yudai*; Kagomiya, Isao*; Matsue, Ikuya*; Kakimoto, Kenichi*; Matsumura, Daiju; Yoneda, Yasuhiro

ChemistrySelect (Internet), 7(21), p.e202104575_1 - e202104575_7, 2022/06

https://doi.org/10.1002/slct.202104575

Times Cited Count：0 Percentile：0(Chemistry, Multidisciplinary)

Journal Articles

Microscopic dynamics of lithium diffusion in single crystal of the solid-state electrolyte La $_{2/3-x}$ Li $_{3x}$ TiO $_{3}$ (x = 0.13) studied by quasielastic neutron scattering

Matsuura, Masato*; Fujiwara, Yasuyuki*; Moriwake, Hiroki*; Ohara, Koji*; Kawakita, Yukinobu

Physical Review B, 104(9), p.094305_1 - 094305_7, 2021/09

https://doi.org/10.1103/PhysRevB.104.094305

Times Cited Count：5 Percentile：44.86(Materials Science, Multidisciplinary)

Journal Articles

Suppressed lattice disorder for large emission enhancement and structural robustness in hybrid lead iodide perovskite discovered by high-pressure isotope effect

Kong, L.*; Gong, J.*; Hu, Q.*; Capitani, F.*; Celeste, A.*; Hattori, Takanori; Sano, Asami; Li, N.*; Yang, W.*; Liu, G.*; et al.

Advanced Functional Materials, 31(9), p.2009131_1 - 2009131_12, 2021/02

https://doi.org/10.1002/adfm.202009131

Times Cited Count：22 Percentile：80.38(Chemistry, Multidisciplinary)

The soft nature of organic-inorganic halide perovskites renders their lattice particularly tunable to external stimuli such as pressure, undoubtedly offering an effective way to modify their structure for extraordinary optoelectronic properties. However, these soft materials meanwhile feature a general characteristic that even a very mild pressure will lead to detrimental lattice distortion and weaken the critical light-matter interaction, thereby triggering the performance degradation. Here, using the methylammonium lead iodide as a representative exploratory platform, we observed the pressure-driven lattice disorder can be significantly suppressed via hydrogen isotope effect, which is crucial for better optical and mechanical properties previously unattainable.

Journal Articles

Local fields at nonmagnetic impurity sites in a perovskite ${rm La_{0.7}Ca_{0.3}MnO_3}$

Sato, Wataru*; Komatsuda, Sayaka*; Osa, Akihiko; Sato, Tetsuya; Okubo, Yoshitaka*

Hyperfine Interactions, 237(1), p.113_1 - 113_6, 2016/12

https://doi.org/10.1007/s10751-016-1325-2

Times Cited Count：2 Percentile：61.78(Physics, Atomic, Molecular & Chemical)

The magnetic hyperfine field and electric field gradient at the $^{111}$ Cd( $^{rm 111m}$ Cd) and $^{rm 111}$ Cd( $^{rm 111}$ In) probe nuclei introduced in a perovskite manganese oxide ${rm La_{0.7}Ca_{0.3}MnO_{3}}$ ( 250 K) were measured for the study of the local magnetism and structure by means of time-differential perturbed angular correlation spectroscopy. In the ferromagnetic phase at 77 K, a very slight supertransferred magnetic hyperfine field (SMHF) ( 0.014 T) combined with a well-defined electric field gradient was observed at the nonmagnetic $^{111}$ Cd nucleus on the La/Ca A site. This observation suggests that the large magnetic hyperfine field ( $B_{hf}$ = 6.9 T) measured, in our previous work, at the $^{140}$ Ce probe nucleus on the A site originates from the contribution of a 4 spin oriented by the SMHF from adjacent Mn ions.

Journal Articles

Evaluation of radiation tolerance of perovskite solar cell for use in space

Miyazawa, Yu*; Ikegami, Masashi*; Miyasaka, Tsutomu*; Oshima, Takeshi; Imaizumi, Mitsuru*; Hirose, Kazuyuki*

Proceedings of 42nd IEEE Photovoltaic Specialists Conference (PVSC-42) (CD-ROM), p.1178 - 1181, 2015/06

https://doi.org/10.1109/PVSC.2015.7355859

Journal Articles

Structure, magnetism and transport of the perovskite manganites $_{0.5}$ Ca $_{0.5}$ MnO $_{3}$ (=Ho, Er, Tm, Yb and Lu)

Yoshii, Kenji; Abe, Hideki*; Ikeda, Naoshi*

Journal of Solid State Chemistry, 178(12), p.3615 - 3623, 2005/12

https://doi.org/10.1016/j.jssc.2005.08.033

Times Cited Count：25 Percentile：67.33(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Neutron diffraction and X-ray absorption study of CaMn $_{0.6}$ Ru $_{0.4}$ O $_{3}$

Yoshii, Kenji; Nakamura, Akio; Mizumaki, Masaichiro*; Tanida, Hajime*; Kawamura, Naomi*; Abe, Hideki*; Ishii, Yoshinobu; Shimojo, Yutaka; Morii, Yukio

Journal of Magnetism and Magnetic Materials, 272-276(Suppl.), p.e609 - e611, 2004/05

https://doi.org/10.1016/j.jmmm.2003.11.305

Times Cited Count：4 Percentile：25.12(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Extraction of hydrogen from water vapor by hydrogen pump using ceramic proton conductor

Kawamura, Yoshinori; Konishi, Satoshi; Nishi, Masataka

Fusion Science and Technology, 45(1), p.33 - 40, 2004/01

https://doi.org/10.13182/FST04-A423

Times Cited Count：25 Percentile：81.94(Nuclear Science & Technology)

Aiming at realization of the efficient blanket tritium recovery system of a fusion reactor, research and development of the hydrogen pump using the proton conductor are furthered. One of the advantages of the system using the hydrogen pump is concurrent processing of hydrogen isotopes and water vapor by one component. In this work, experimental research on the hydrogen extraction characteristic in a water molecule was performed with the hydrogen pump using SrCe $_{0.95}$ Yb $_{0.05}$ O $_{3-alpha}$ . In hydrogen extraction from a water molecule, application of the threshold, voltage corresponding to the decomposition energy of water, is necessary. The observed threshold was about 500-600mV at 873K and decreased with the increase in water vapor pressure. About pumping of H $_{2}$ -H $_{2}$ O mixture gas, the permeation of H $_{2}$ anteceded water decomposition, and the threshold of water decomposition increased with the increase in hydrogen partial pressure. In order to process concurrently, application of fairly higher voltage is expected to be necessary.

Journal Articles

Doping effects of Ru in $_{0.5}$ Sr $_{0.5}$ CoO $_{3}$ (=La, Pr, Nd, Sm, and Eu)

Yoshii, Kenji; Abe, Hideki*

Physical Review B, 67(9), p.094408_1 - 094408_8, 2003/03

https://doi.org/10.1103/PhysRevB.67.094408

Times Cited Count：40 Percentile：82.47(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Structure and magnetism of Eu $_{1-x}$ Dy $_{x}$ TiO $_{3}$

Yoshii, Kenji; Mizumaki, Masaichiro*; Nakamura, Akio; Abe, Hideki*

Journal of Solid State Chemistry, 171(1-2), p.345 - 348, 2003/02

https://doi.org/10.1016/S0022-4596(02)00231-1

Times Cited Count：9 Percentile：30.79(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Immortal catalytic activity for cleaning up automotive emissions; Intelligent catalyst

Nishihata, Yasuo; Tanaka, Hirohisa*

SPring-8 Riyosha Joho, 7(6), p.359 - 363, 2002/11

Catalytic converters are widely applied to control automotive emissions, such as nitrogen oxides, carbon monoxide and unburned hydrocarbons. In actual catalysts, however, the catalytic activity deteriorates due to the particle growth of precious metals during vehicle use. An ageless catalyst is a kind of philosopher's stone in automotive engineering. Referring to the wisdom of ancient Indian philosophy and medical science, Ayur Veda, we have developed a new self-regenerating perovskite-based catalyst. The perovskite catalyst, LaFe $_{0.57}$ Co $_{0.38}$ Pd $_{0.05}$ O $_{3}$ , regenerates itself without any auxiliary treatment, in direct reaction to the natural fluctuation between reductive and oxidative atmospheres in the exhaust gas from state-of-the-art gasoline engines. As palladium reversibly moves back and forth between inside and outside of the perovskite crystal, the particle growth of palladium can be suppressed. Such a self-regeneration provides new insight into the development of future automotive catalyst, as an intelligent catalyst.