N-Doped spherical mesoporous carbon clutches: A breakthrough for stabilizing high-load cobalt alloys in efficient NaBH4 hydrolysis

초록

Maximizing cobalt loading while preventing agglomeration and ensuring stability on catalyst supports remains a significant challenge. This study presents the successful fabrication of a high-loading metal stabilizer based on nitrogen-doped porous carbon clutches (NPCCs) and highlights its performance in hydrogen generation. NPCCs were synthesized using a templated sol-gel-assisted polymerization technique. Their spherical morphology and abundant mesopores enable effective decoration with Ni-Co alloy nanoparticles at up to 70% loadings, with an average particle diameter of 20 nm at this loading level. The effects of Ni-Co alloy composition and total metal loading on catalytic performance were investigated, revealing that 50%Ni0 & sdot;2Co0 & sdot;8/NPCCs exhibited the highest efficiency in the catalytic hydrolysis of NaBH4. A decorated encapsulation approach using a reduction carbonization strategy was employed to enhance cobalt stability under practical recycling conditions. As a result, the catalyst 50%Ni0 & sdot;2Co0 & sdot;8/NPCCs@PC demonstrated a remarkable improvement in hydrogen generation rate retention, increasing from 27% to 90%. This stabilization strategy for high metal loading offers significant practical implications for catalytic applications.

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