Synthesis Of Ag Nanoparticle/reduced Graphene Oxide And Investigation Of Its Catalytic Properties

Catalysts are of great importance in chemical industry for almost 95%chemical production process involving catalysts.Among them,metal-based catalyst plays a significant role in chemical production process as well as environmental remediation.Great efforts have been made to develop the new catalyst with high efficiency,especially those with high catalytic activity and durability.Herein,we focused on the design and preapartion of nanocomposite based on Ag and graphene,and investigation of the influence on the morphologies and structures on the catalytic performance.The reason why we chose silver and graphene lies in:silver owns high conductivity and is regarded as a prmosing catalyst.Graphene possesses not only high specific surface area,but high conductivity,which makes the combination of the two materials a potential candidate in catalysis.Moreover,the effect of the morphologies of silver nanoparticles and the structure of graphene on the properties are studied.The detailed information is presented as below:1)We developed a facile hydrothermal method to synthesize Ag nanoprismon reduced graphene oxide?rGO?with the assistance of sodium alginate?SA?.It was found that most of the Ag nanoparticles have?111?external facets which are parallel to the?0001?of the reduced graphene oxide matrix and thus the Ag nano-particles have shown a triangle morphology.When used as a catalyst in the oxidation of hydroquinone,the obtained SA-Ag-rGO showed an outstanding performance:the catalytic rate constant of the hybrid is more than 12 times higher than that of Ag spherical particles on graphene sheets.2)A facile cost-efficient method was developed for the fabrication of Ag/graphene composite with 3-dimensional structures,where Ag nanoparticles with average size of¹8 nm were formed and distributed uniformly on graphene sheets.The microstructures and morphologies were confirmed by SEM and TEM images.When used as non-enzymatic sensor,the obtained Ag/3D-rGO electrode demonstrated excellent electrocatalytic activities towards the detection of hydrogen peroxide?H₂O₂?,over a wide linear range from 0.016 to 27 mM with a high sensitivity of 419.7?A Mm^-1cm^-2.And the detection limit is as low as 6.8?M.Moreover,the electrode showed fantastic selectivity of H₂O₂ against citric acid?CA?,ascorbic acid?AA?and glucose?Glu?,which provide a promising biological sensors with high performance.