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Platinum-Grafted Twenty-Five Atom Gold Nanoclusters for Robust Hydrogen Evolution
Paloli Mymoona1,2, Jose V Rival3, Nonappa4
1Electroplating and Metal Finishing Division, Council of Scientific and Industrial Research (CSIR)-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, 630003, India.
Grafting minimal platinum onto gold nanoclusters enhances hydrogen evolution. This electrochemical activation and modification strategy offers a promising route for sustainable green hydrogen production.
Area of Science:
- Nanomaterials Science
- Electrocatalysis
- Sustainable Energy
Background:
- Gold nanoclusters (Au25(PET)18) are explored for hydrogen evolution.
- Developing efficient and cost-effective catalysts for hydrogen production is crucial.
Purpose of the Study:
- To demonstrate robust hydrogen evolution from platinum-grafted gold nanoclusters.
- To investigate the effect of electrochemical activation and surface modification on catalytic performance.
Main Methods:
- Electrochemical activation of gold nanoclusters by partial thiol removal.
- Electroless grafting of platinum onto exposed gold sites.
- Characterization using lead underpotential deposition and electron microscopy.
- Electrocatalytic testing for hydrogen evolution reaction (HER) in acidic medium.
Main Results:
- Electrocatalytic activity of Au25(PET)18 nanoclusters improved after electrochemical activation.
- Platinum-grafted nanoclusters achieved a low overpotential (0.117 V vs RHE) at 10 mA cm−2, comparable to commercial Pt/C.
- Activated nanoclusters exhibited enhanced reactivity at higher current densities.
- Modified nanoclusters displayed unique supramolecular self-assembly.
Conclusions:
- Post-surface modification of gold nanoclusters is an effective strategy for enhancing HER.
- This approach provides a pathway for the sustainable production of green hydrogen.
- The findings highlight the potential of tailored nanomaterials in catalysis.
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