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280 results on '"Fukunaka, Yasuhiro"'

30. 溶融塩電解技術とin-situ Resources Utilization研究

Author

GOTO, Takuya, SUZUKI, Yuta, and FUKUNAKA, Yasuhiro

Abstract

第36回宇宙環境利用シンポジウム (2022年1月18日-19日. オンライン開催), Space Utilization Research (January 18-19, 2022. Online Meeting), 資料番号: SA6000168012, G-11

Published
2022

37. Experimental Measurement of Overpotential Sources during Anodic Gas Evolution in Aqueous and Molten Salt Systems

Author

Massachusetts Institute of Technology. Department of Materials Science and Engineering, MIT Materials Research Laboratory, Chmielowiec, Brian John, Fujimura, Tatsuki, Otani, Tomohiro, Aoyama, Kiego, Nohira, Toshiyuki, Homma, Takayuki, Fukunaka, Yasuhiro, Allanore, Antoine, Massachusetts Institute of Technology. Department of Materials Science and Engineering, MIT Materials Research Laboratory, Chmielowiec, Brian John, Fujimura, Tatsuki, Otani, Tomohiro, Aoyama, Kiego, Nohira, Toshiyuki, Homma, Takayuki, Fukunaka, Yasuhiro, and Allanore, Antoine

Abstract

Current interrupt and galvanostatic EIS techniques were utilized in a complementary fashion to characterize the different sources of overpotential during anodic gas evolution. Room temperature anodic evolution of oxygen at a nickel working electrode in aqueous potassium hydroxide and the high temperature (348°C) anodic evolution of chlorine at a glassy carbon working electrode in molten (LiCl)[subscript 57.5-](KCl)[subscript 13.3-](CsCl)[subscript 29.2 ] where investigatd. Combining of the two techniques enables to separate the total measured overpotential into its ohmic, charge transfer, and mass transfer components. Potential decay curves indicated that natural convection (due to both bubble evolution and density driven flow) was a major driving force in reestablishing equilibrium conditions at the working electrode surface. During oxygen evolution, charge transfer resistance dominated the total overpotential at low current densities, but as the current density approached ~100mA/cm[superscript 2], mass transfer overpotentials and ohmic overpotential became non-negligible. The mass transfer overpotential during chlorine evolution was found to be half that found during oxygen evolution., Naval Research (Contract N00014-12-1-0521)

Published
2021

43. 月面でのISRUに向けた技術開発

Author

Goto, Takuya, Suzuki, Yuta, and Fukunaka, Yasuhiro

Abstract

第34回宇宙環境利用シンポジウム (2020年1月21日-22日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県, Space Utilization Research (January 21-22, 2020. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000145019, G-11

Published
2020

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