[2P01-29] Poster session

[2P20] Ion-exchange-like nickel decoration into hydrogen boride

*Yoshika Tamegai¹, Natsumi Noguchi¹, Zihao Kang¹, Kosei Fukuda¹, Shohei Shimozato¹, Myu Kawase¹, Shin-ichi Ito², Miwa Hikichi², Osamu Oki^2,3, Takahiro Kondo^2,3,4,5,6 (1. Graduate School of Science and Technology, University of Tsukuba (Japan), 2. Institute of Pure and Applied Sciences, University of Tsukuba (Japan), 3. Hydrogen Boride Research Center, Tsukuba Institute of Advanced Research, University of Tsukuba (Japan), 4. Tsukuba Research Center for Energy Materials Science, Institute of Pure and Applied Sciences, University of Tsukuba (Japan), 5. The Advanced Institute for Materials Research (WPI-AIMR), Tohoku University (Japan), 6. Research Center for Energy and Environmental Materials, National Institute for Materials Science (Japan))

Ammonia (NH₃) has been studied as one of the hydrogen carriers owing to its high hydrogen (H) content. Hydrogen boride (HB) nanosheets can adsorb NH₃ and generate H₂ upon heating, but H₂ release occurs at relatively high temperatures. Incorporating Ni species, which are commonly used NH₃ decomposition catalysts, is expected to promote H₂ release from NH₃-adsorbed HB. In this study, Ni-decorated HB (Ni-HB) was prepared using nickel(II) chloride hexahydrate. FT-IR analysis indicated retention of the HB framework. XPS results showed Ni-related peaks and no detectable Cl-related peaks. The Ni 2p signal was consistent with Ni^2−δ-like chemical state, while B 1s was mainly assigned to B^δ−. Unlike a previous method using nickel acetylacetonate, this method enables to introduce Ni without detectable counter species from the Ni precursor. These results suggest that Ni can be introduced into HB in an ion-exchange-like manner while retaining the characteristic electronic state of HB.

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