Rapid biological synthesis of platinum nanoparticles using <Emphasis Type="Italic">Ocimum sanctum</Emphasis> for water electrolysis applications |
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Authors: | C Soundarrajan A Sankari P Dhandapani S Maruthamuthu S Ravichandran G Sozhan N Palaniswamy |
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Institution: | (1) Corrosion Protection Division, Central Electrochemical Research Institute (CSIR), Karaikudi, 630 006, India;(2) Electroinorganic Division, Central Electrochemical Research Institute (CSIR), Karaikudi, 630 006, India; |
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Abstract: | The leaf extract of Ocimum sanctum was used as a reducing agent for the synthesis of platinum nanoparticles from an aqueous chloroplatinic acid (H2PtCl6·6H2O). A greater conversion of platinum ions to nanoparticles was achieved by employing a tulsi leaf broth with a reaction temperature
of 100 °C. Energy-dispersive absorption X-ray spectroscopy confirmed the platinum particles as major constituent in the reduction
process. It is evident from scanning electron microscopy that the reduced platinum particles were found as aggregates with
irregular shape. Fourier-transform infrared spectroscopy revealed that the compounds such as ascorbic acid, gallic acid, terpenoids,
certain proteins and amino acids act as reducing agents for platinum ions reduction. X-ray diffraction spectroscopy suggested
the associated forms of platinum with other molecules and the average particle size of platinum nanoparticle was 23 nm, calculated
using Scherer equation. The reduced platinum showed similar hydrogen evolution potential and catalytic activity like pure
platinum using linear scan voltammetry. This environmentally friendly method of biological platinum nanoparticles production
increases the rates of synthesis faster which can potentially be used in water electrolysis applications. |
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