A joint research group from Tohoku University, Tokyo University of Science, Tokyo Metropolitan University, and the Japan Fine Ceramics Center has developed a gold-platinum (Au₂₄Pt) alloy nanocluster catalyst that exhibits significantly improved carbon monoxide (CO) oxidation activity under low-temperature conditions. This breakthrough was reported in Nano Letters on July 10, 2026.
Advancements in Nanocluster Catalysts
The research team introduced dithiolate (SR'S) bridging ligands into the nanocluster, enhancing its catalytic properties. Traditional alloy nanoclusters, like Au₂₄Pt(SR)₁₈, are typically stable but have limited catalytic activity due to protective ligands blocking active metal sites. By innovating the ligand design, researchers achieved a balance between stability and accessibility.
By reinforcing the outer framework of the nanocluster with the new ligand design, the researchers ensured that the ligands could be removed at lower temperatures while maintaining the structural integrity of the catalyst.
Performance Comparison of Catalysts
The newly engineered alloy nanocluster, [Au₂₄Pt(TBBT)₁₂(TDT)₃]⁰, demonstrated remarkable performance when supported on cerium oxide (CeO₂). It achieved a 39 °C reduction in the temperature required for 50% CO conversion compared to conventional catalysts like [Au₂₄Pt(PET)₁₈]⁰.
- New alloy nanocluster: [Au₂₄Pt(TBBT)₁₂(TDT)₃]⁰
- Temperature reduction for 50% CO conversion: 39 °C
- Previous catalyst: [Au₂₄Pt(PET)₁₈]⁰
Innovative Ligand Engineering
The ligand engineering strategy involved replacing original PET ligands with TBBT and TDT ligands. This approach allowed for the selective removal of monothiolate ligands while preserving the stability provided by the dithiolate framework. The results from direct insertion probe mass spectrometry revealed that the new nanocluster effectively detached the weaker ligands without compromising the overall structure.
This advancement highlights the potential of atomically precise metal nanoclusters in catalysis, as their geometric and electronic structures can be tailored for enhanced performance while ensuring structural integrity.
🤖 This article was rewritten by Feed and Figures' editorial AI from a report originally published by Phys.org. Facts and quotes are preserved from the original; the rewrite focuses on clarity and structure. For the unedited original, see the source link below.
