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Article

Generating Mechanism of Catalytic Effect for Hydrogen Absorption/Desorption Reactions in NaAlH4–TiCl3

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Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
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J-PARC Center, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
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School of High Energy Accelerator Science, The Graduate University for Advanced Studies, Tsukuba, Ibaraki 305-0801, Japan
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Graduate School of Science and Engineering, Ibaraki University, Mito, Ibaraki 310-8512, Japan
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Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
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National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8569, Japan
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Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology, Sayo, Hyogo 679-5148, Japan
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Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai, Miyagi 980-8577, Japan
*
Author to whom correspondence should be addressed.
Present address: Innovative Research Excellence, Honda R&D Co., Ltd., Haga, Tochigi 321-3393, Japan.
Present address: Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan.
§
Present address: Department of Engineering Science and Mechanics, College of Engineering, Shibaura Institute of Technology, Toyosu, Koto-ku, Tokyo 135-8548, Japan.
Academic Editor: Agnese Magnani
Appl. Sci. 2021, 11(18), 8349; https://doi.org/10.3390/app11188349
Received: 30 July 2021 / Revised: 4 September 2021 / Accepted: 7 September 2021 / Published: 9 September 2021
(This article belongs to the Special Issue New Vistas in Metal Hydrides and Related Materials)
The hydrogen desorption and absorption reactions of the complex metal hydride NaAlH4 are disproportionation processes, and the kinetics can be improved by adding a few mol% of Ti compounds, although the catalytic mechanism, including the location and state of Ti, remains unknown. In this study, we aimed to reveal the generating mechanism of catalytic Al–Ti alloy in NaAlH4 with TiCl3 using quantum multiprobe techniques such as neutron diffraction (ND), synchrotron X-ray diffraction (XRD), anomalous X-ray scattering (AXS), and X-ray absorption fine structure (XAFS). Rietveld refinements of the ND and XRD, profiles before the first desorption of NaAlD(H)4–0.02TiCl3 showed that Al in NaAlD(H)4 was partially substituted by Ti. On the other hand, Ti was not present in NaAlH4, and Al–Ti nanoparticles were detected in the XRD profile after the first re-absorption. This was consistent with the AXS and XAFS results. It is suggested that the substitution promotes the formation of a highly dispersed nanosized Al–Ti alloy during the first desorption process and that the effectiveness of TiCl3 as an additive can be attributed to the dispersion of Ti. View Full-Text
Keywords: neutron diffraction; X-ray diffraction; anomalous X-ray scattering; X-ray absorption fine structure; hydrogen storage; hydride complex neutron diffraction; X-ray diffraction; anomalous X-ray scattering; X-ray absorption fine structure; hydrogen storage; hydride complex
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MDPI and ACS Style

Ikeda, K.; Fujisaki, F.; Otomo, T.; Ohshita, H.; Honda, T.; Kawamata, T.; Arima, H.; Sugiyama, K.; Abe, H.; Kim, H.; Sakaki, K.; Nakamura, Y.; Machida, A.; Sato, T.; Takagi, S.; Orimo, S.-i. Generating Mechanism of Catalytic Effect for Hydrogen Absorption/Desorption Reactions in NaAlH4–TiCl3. Appl. Sci. 2021, 11, 8349. https://doi.org/10.3390/app11188349

AMA Style

Ikeda K, Fujisaki F, Otomo T, Ohshita H, Honda T, Kawamata T, Arima H, Sugiyama K, Abe H, Kim H, Sakaki K, Nakamura Y, Machida A, Sato T, Takagi S, Orimo S-i. Generating Mechanism of Catalytic Effect for Hydrogen Absorption/Desorption Reactions in NaAlH4–TiCl3. Applied Sciences. 2021; 11(18):8349. https://doi.org/10.3390/app11188349

Chicago/Turabian Style

Ikeda, Kazutaka, Fumika Fujisaki, Toshiya Otomo, Hidetoshi Ohshita, Takashi Honda, Toru Kawamata, Hiroshi Arima, Kazumasa Sugiyama, Hitoshi Abe, Hyunjeong Kim, Kouji Sakaki, Yumiko Nakamura, Akihiko Machida, Toyoto Sato, Shigeyuki Takagi, and Shin-ichi Orimo. 2021. "Generating Mechanism of Catalytic Effect for Hydrogen Absorption/Desorption Reactions in NaAlH4–TiCl3" Applied Sciences 11, no. 18: 8349. https://doi.org/10.3390/app11188349

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