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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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: catalysts

Date published: 2025-01-23

Publisher: American Chemical Society (ACS)

Journal:

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

Funding:

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

Manuscript type: Publisher's version (Version of record)

MDR DOI:

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

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Updated at: 2025-03-26 17:26:47 +0900

Published on MDR: 2025-03-26 17:26:48 +0900