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説明:

We fabricated Co-based catalysts by the low temperature thermal decomposition of R–Co intermetallics (R = Y, La, or Ce) to reduce the temperature of ammonia cracking for hydrogen production. The catalysts synthesized are nanocomposites of ROx/Co with the inverse structure. In the LaO1.5/Co catalyst derived from LaCo13, Co nanoparticles of 10–30 nm size are enclosed by the LaO1.5 matrix. The nanocomposite exhibited superior catalytic activity (91% at 500 ℃), which was attributed to dual advantages derived from its inverse structure; the low workfunction of O-deficient LaO1.5-x nanoparticles promotes electron donation to the Co catalyst in the interface, which leads to enhanced N–H bond dissociation. Moreover, such an inverse structure is effective in suppressing the grain growth of Co nanoparticles because the LaO1.5 layer works as a diffusion barrier against Co. The thermal decomposition of intermetallics is a new route for the facile synthesis of inverse catalysts.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: catalysts

刊行年月日: 2025-01-23

出版者: American Chemical Society (ACS)

掲載誌:

• The Journal of Physical Chemistry Letters (ISSN: 19487185) vol. 16 issue. 3 p. 796-801

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology JPMXP1224NM5138
• Japan Society for the Promotion of Science 23K23440
• Fujikura Foundation

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acs.jpclett.4c03309

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更新時刻: 2025-03-26 17:26:47 +0900

MDRでの公開時刻: 2025-03-26 17:26:48 +0900