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Journal Articles

Enhancement of Fe-N-C carbon catalyst activity for the oxygen reduction reaction; Effective increment of active sites by a short and repeated heating process

Yasuda, Satoshi; Uchibori, Yosuke*; Wakeshima, Makoto*; Hinatsu, Yukio*; Ogawa, Hiroaki; Yano, Masahiro; Asaoka, Hidehito

RSC Advances (Internet), 8(66), p.37600 - 37605, 2018/11

 Times Cited Count:7 Percentile:42.43(Chemistry, Multidisciplinary)

We present a quantitative study on the effect of a newly obtained thermal history on the formation of Fe-N-C catalytic sites. A short and repeated heating process is employed as the new thermal history, where short heating (1 min) followed by quenching is applied to a sample with arbitrary repetition. Through electrochemical quantitative analysis, it is found that the new process effectively increases the Fe-N-C mass-based site density (MSD) to almost twice that achieved using a conventional continuous heating process, while the turn-over frequency (TOF) is independent of the process. Elemental analysis shows that the new process effectively suppresses the thermal desorption of Fe and N atoms during the initial formation stage and consequently contributes to an increase in the Fe-N-C site density. The resultant catalytic activity (gravimetric kinetic current density (0.8 V vs. RHE)) is 1.8 times higher than that achieved with the continuous heating process.

Journal Articles

Crystal structures and magnetic properties of nickel chain compounds PbM$$_2$$Ni$$_6$$Te$$_3$$O$$_{18}$$ (M = Mn, Cd)

Doi, Yoshihiro*; Suzuki, Ryo*; Hinatsu, Yukio*; Kodama, Katsuaki; Igawa, Naoki

Inorganic Chemistry, 54(22), p.10725 - 10731, 2015/11

 Times Cited Count:5 Percentile:31.75(Chemistry, Inorganic & Nuclear)

Journal Articles

Lanthanides ($$^{151}$$Eu and $$^{155}$$Gd)-M$"o$ssbauer spectroscopic study of defect-fluorite oxides coupled with new defect crystal chemistry model

Nakamura, Akio; Igawa, Naoki; Okamoto, Yoshihiro; Hinatsu, Yukio*; Wang, J.*; Takahashi, Masashi*; Takeda, Masuo*

M$"o$ssbauer Spectroscopy; Applications in Chemistry, Biology, and Nanotechnology, p.71 - 94, 2013/10

Journal Articles

Defect-fluorite oxides; Ln (Eu and Gd) M$"o$ssbauer study coupled with new defect-crystal-chemistry model

Nakamura, Akio; Igawa, Naoki; Okamoto, Yoshihiro; Wang, J.*; Hinatsu, Yukio*; Takahashi, Masashi*; Takeda, Masuo*

Hyperfine Interactions, 217(1-3), p.17 - 26, 2013/04

 Times Cited Count:1 Percentile:54.32

Journal Articles

Defect-fluorite oxides M$$_{1-y}$$Ln$$_{y}$$O$$_{2-y/2}$$ (Ln = lanthanide; M = Hf, Zr, Ce, U, Th); Structure, property, and applications

Nakamura, Akio; Masaki, Nobuyuki; Otobe, Haruyoshi; Hinatsu, Yukio*; Wang, J.*; Takeda, Masuo*

Pure and Applied Chemistry, 79(10), p.1691 - 1729, 2007/10

 Times Cited Count:14 Percentile:48.92(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

$$^{151}$$Eu-M$"o$ssbauer spectroscopic and X-ray diffraction study of the Eu$$_{2}$$(Ce$$_{1-x}$$Zr$$_{x}$$)$$_{2}$$O$$_{7}$$ and LnEuZr$$_{2}$$O$$_{7}$$(Ln=lanthanide) systems

Masaki, Nobuyuki; Nakamura, Akio; Furuuchi, Fumihito*; Hinatsu, Yukio*

Journal of Physics and Chemistry of Solids, 66(2-4), p.312 - 317, 2005/02

 Times Cited Count:9 Percentile:41.42(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Investigation of structural and electronic properties in Ru perovskite oxides by XAFS measurements

Mizumaki, Masaichiro*; Yoshii, Kenji; Hinatsu, Yukio*; Doi, Yoshihiro*; Uruga, Tomoya*

Physica Scripta, T115, p.513 - 515, 2005/00

The electronic and structural properties of Ru oxides were investigated by utilizing X-ray absorption spectroscopy (XAS). We estimate the valence of Ru in perovskite ruthenium oxides by XAS measurements. XAS measurements were carried out at room temperature around Ru K-edge. The valence of Ru in $$A$$$$_{2}$$ ($$A$$ = Ba, Sr)LnRuO$$_{6}$$ and $$A$$ ($$A$$ = Ca, Ba, Sr)RuO$$_{3}$$ was 4+. The valence of Ru in Ln$$_{3}$$RuO$$_{7}$$ was 5+. The valence of Ru in PbRuO$$_{3}$$ showed an intermediate value between 4+ and 5+. Theoretical calculation reproduced the experimental spectra. We analyzed XAS spectra and obtained information of local structure. The bond length between Ru and O was consistent with the results of neutron diffraction.

Journal Articles

Magnetic studies on quaternary iron sulfides BaLn$$_2$$FeS$$_5$$(Ln=Ce,Pr,Nd,Sm) by magnetic susceptibility, specific heat, $$^{57}$$Fe m$"o$ssbauer spectrum, and neutron diffraction measurements

Wakeshima, Makoto*; Ino, Kentaro*; Hinatsu, Yukio*; Ishii, Yoshinobu

Bulletin of the Chemical Society of Japan, 76(8), p.1519 - 1525, 2003/08

 Times Cited Count:2 Percentile:13.79(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Electrical and magnetic properties of pseudo-one-dimensional calcium iridium oxide Ca$$_{5}$$Ir$$_{3}$$O$$_{12}$$

Wakeshima, Makoto*; Taira, Nobuyuki*; Hinatsu, Yukio*; Ishii, Yoshinobu

Solid State Communications, 125(6), p.311 - 315, 2003/02

 Times Cited Count:18 Percentile:65.47(Physics, Condensed Matter)

no abstracts in English

Journal Articles

$$^{151}$$Eu M$"o$ssbauer spectroscopic study on the Eu$$_{y}$$M$$_{1-y}$$O$$_{2-y}$$(0$$leq$$y$$leq$$1.0)(M=Th, U)

Masaki, Nobuyuki; Otobe, Haruyoshi; Nakamura, Akio; Harada, Daijitsu*; Ito, Kentaro*; Sasaki, Yoshinobu*; Hinatsu, Yukio*

Journal of Nuclear Science and Technology, 39(Suppl.3), p.217 - 220, 2002/11

no abstracts in English

Journal Articles

Magnetic and calorimetric studies on ordered perovskite Ba$$_{2}$$ErRuO$$_{6}$$

Izumiyama, Yuki*; Doi, Yoshihiro*; Wakeshima, Makoto*; Hinatsu, Yukio*; Nakamura, Akio; Ishii, Yoshinobu

Journal of Solid State Chemistry, 169(1), p.125 - 130, 2002/11

 Times Cited Count:36 Percentile:79.42(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

X-ray diffraction and $$^{151}$$Eu-M$"o$ssbauer spectroscopic study of the Hf$$_{1-x}$$Eu$$_{x}$$O($$_{2-x/2}$$)(0$$leq$$x$$leq$$1.0) system

Harada, Daijitsu*; Hinatsu, Yukio*; Masaki, Nobuyuki; Nakamura, Akio

Journal of the American Ceramic Society, 85(3), p.647 - 652, 2002/03

no abstracts in English

Journal Articles

$$^{151}$$Eu-M$"o$ssbauer spectroscopic study of the fluorite-type oxide solid solutions, Eu$$_{y}$$M$$_{1-y}$$O$$_{2-y/2}$$ (M=Zr,Ce)(0$$leq$$y$$leq$$1.0)

Masaki, Nobuyuki; Guillermo, N. R. D.; Otobe, Haruyoshi; Nakamura, Akio; Izumiyama, Yuki*; Hinatsu, Yukio*

Advances in Science and Technology, 29, p.1233 - 1240, 2000/00

no abstracts in English

Journal Articles

Crystal structures and magnetic properties of Ca$$_{2-x}$$Sr$$_{x}$$MnO$$_{4}$$

*; *; Hinatsu, Yukio*; Shimojo, Yutaka; Morii, Yukio

Journal of Solid State Chemistry, 145(2), p.705 - 710, 1999/00

 Times Cited Count:24 Percentile:68.24(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic and neutron diffraction studies on potassium uranate KUO$$_{3}$$

Hinatsu, Yukio*; Shimojo, Yutaka; Morii, Yukio

Journal of Alloys and Compounds, 270, p.127 - 131, 1998/00

 Times Cited Count:8 Percentile:53.92(Chemistry, Physical)

no abstracts in English

Journal Articles

Magnetic properties of layered perovskites NaLnTiO$$_{4}$$(Ln=Sm,Eu,and Gd)

*; Hinatsu, Yukio*; ; Saeki, Masakatsu

Journal of Solid State Chemistry, 138(2), p.342 - 346, 1998/00

 Times Cited Count:16 Percentile:54.35(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic and neutron diffraction study on perovskites La$$_{1-x}$$Sr$$_{x}$$CrO$$_{3}$$

*; Hinatsu, Yukio*; Nakamura, Akio; Inami, Toshiya; Shimojo, Yutaka; Morii, Yukio

Journal of Solid State Chemistry, 141, p.404 - 410, 1998/00

 Times Cited Count:81 Percentile:95.72(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic properties of ordered perovskite oxide Ba$$_{3}$$ZnU$$_{2}$$O$$_{9}$$

Hinatsu, Yukio

Journal of Alloys and Compounds, 218, p.58 - 63, 1995/00

 Times Cited Count:2 Percentile:31.91(Chemistry, Physical)

no abstracts in English

Journal Articles

Antiferromagnetic ordering in CoU$$_{2}$$O$$_{6}$$ and NiU$$_{2}$$O$$_{6}$$

Hinatsu, Yukio

Journal of Solid State Chemistry, 114, p.595 - 597, 1995/00

 Times Cited Count:7 Percentile:36.21(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic properties of tetravalent praseodymium perovskites BaPrO$$_{3}$$, BaCe$$_{y}$$Pr$$_{1-y}$$O$$_{3}$$, and Sr$$_{y}$$Ba$$_{1-y}$$PrO$$_{3}$$

Hinatsu, Yukio

Journal of Solid State Chemistry, 119, p.405 - 411, 1995/00

 Times Cited Count:11 Percentile:46.7(Chemistry, Inorganic & Nuclear)

no abstracts in English

49 (Records 1-20 displayed on this page)