Electrochemical behavior of silver nanoparticles synthesized at different temperatures

Nanocatalysis has recently been a rapidly growing field which involves the use of nanoparticles as catalysts for a variety of organic and inorganic reactions (1). Ag nanoparticles show excellentcatalytic and electrocatalytic activities. For the past few years, various rapid chemical methods have been developed for the synthesis of silver nanoparticles (2). Reduction of AgNO3 by reductants such as citrate, ascorbic acid, or borohydride, is among the most used methods for thepreparation of silver nanoparticles in aqueous solution (3). In this work, first silver nanoparticles were synthesized in the presence of gelatin as reductiveand stabilizer in aqueous media at temperature of 500, 600, 700 and 800 °C. The synthesizedsilver nanoparticles were studied by XRD, SEM, EDAX and voltammetry methods. XRD results of silver nanoparticles have shown 28, 25, 22 and 18 nm in size approximately, respectively attemperature of 500, 600, 700 and 800 °C. In order to study the catalytic properties of silver nanoparticles, carbon paste electrodes modified with silver nanoparticles synthesized at different temperatures were prepared and electrochemical behavior of these modified electrodes wereinvestigated in the presence of sulfuric acid. The results showed that the reduction of hydrogen ion was catalyzed by silver nanoparticles, leading to increase cathode current.

کلیدواژه ها:

Silver nanoparticles ، Gelatin ، Catalyst ، Hydrogen evolution reaction