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From Silver Nanoparticles to Nanoclusters: Enhanced Oxygen Evolution Electrocatalysis through Size Reduction
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DOI：10.1039/D6AN00582A.png)
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Abstract
En 中文
Metal nanoclusters (MNCs) have attracted significant attention as emerging catalytic materials due to their ultrasmall size; discrete electronic states; high surface-to-volume ratio; and abundance of accessible active sites. MNCs are promising candidates for a wide range of catalytic applications; however; their application toward oxygen evolution reaction (OER); a kinetically demanding half-reaction in water splitting; remains relatively less explored. In this work; fluorescent silver nanoclusters stabilized with L-Proline (L-Pro-AgNCs) that show blue fluorescence have been synthesized and systematically investigated as electrocatalysts for OER in alkaline medium. The electrocatalytic performance of L-Pro-AgNCs has been compared with that of larger silver nanoparticles (L-Pro-AgNPs) and commercial RuO 2 catalysts. The synthesized L-Pro-AgNCs exhibit superior OER activity with a low overpotential of ~ 250 mV at 10 mA cm -2 and a smaller Tafel slope of 116 mV dec -1 ; outperforming L-Pro-AgNPs and RuO 2 . Cyclic voltammetry (CV) studies reveal a larger electrochemically active surface area and improved charge-storage capability for L-Pro-AgNCs; while electrochemical impedance spectroscopy confirms faster interfacial electron-transfer kinetics with a low charge-transfer resistance of ~0.56 Ω. Furthermore; chronoamperometric measurements demonstrate excellent stability over 16 h under alkaline conditions. This study highlights the strong size-dependent electrocatalytic advantages of silver nanoclusters and establishes them as efficient and stable catalysts for oxygen evolution reactions and sustainable energy conversion applications.
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