4.7 Article

Facile sonochemical synthesis of silver nanoparticle and graphene oxide deposition on bismuth doped manganese oxide nanotube composites for electro-catalytic sensor and oxygen reduction reaction (ORR) applications

Journal

INTERMETALLICS
Volume 131, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2021.107101

Keywords

Bismuth oxide; MnO2; Nanotube; Nanoparticles; TritonX-100; ORR

Funding

  1. Deanship of Scientific Research, King Saud University [RG-1441-043]
  2. Deanship of Scientific Research

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In this study, pristine silver nanoparticles and silver-graphene oxide nanoparticles were incorporated into Bismuth doped manganese oxide nanotubes using an ultra-sonication deposition method. The resulting composite materials showed improved thermal stability and nanotube formation, with nanotube diameters ranging from 10-25 nm and lengths ranging from 40-50 nm, as confirmed by high resolution transmission electron micrographs. The band gap values of the prepared composites were also calculated, with the Ag-Bi-MnOx/GO composite having a bandgap value of 1.93 eV and Bi-MnOx having a value of 2.47 eV. Further analysis showed that the silver nanoparticle-graphene oxide modified Bi-MnOx composite exhibited enhanced electrochemical activity for clean energy technology applications.
Pristine silver nanoparticles and silver-graphene oxide nanoparticles have incorporated in Bismuth doped manganese oxide (Bi-MnOx) nanotubes by an ultra-sonication deposition method. Pristine Bismuth doped porous MnO2 has prepared by a non-ionic surfactant (Triton-X-100) assisted co-precipitation and heat treatment process. In the second stage, the biogenic method prepared very fine Ag nanoparticles with a quantum dot size of particles (below 10 nm). They have further deposited on the dried powder of Bi-MnOx by ultra-sonication fabricate the composite material for electrode application. The pure nanotube formation obtained for silver nanoparticle deposited Bi-MnOx (Ag-BiMnOx) and silver/GO nanoparticle(Ag-BiMnOx/GO) nanocomposites have clearly confirmed by high resolution transmission electron micrographs (HR-TEM). The nanotube diameter obtained in the range of 10-25 nm and length of nanotube obtained in the rage of 40-50 nm. Enhanced thermal stability has achieved for Ag-BiMnOx and Ag-BiMnOx/GO composite compared to pristine manganese oxide. Band gap values of prepared compoiste is calculated from Diffuse reflectance spectral data provide the bandgap values of Ag-Bi-MnOx/GO (1.93 eV) and Bi-MnOx (2.47 eV). As prepared graphene oxide modified Bi-MnOx composite modified electrode have further analyzed for hydrogen peroxide sensor and Oxygen reduction reactions (ORR). Silver nanoparticle-graphene oxide modified Bi-MnOx composite shows an enhanced electrochemical capacitance activity of 2.61 mF and improved electrochemical surface area of 65.25 cm(2) towards clean energy technology application.

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