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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

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

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

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