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Title: Synthesis and electrocatalytic performance for p-nitrophenol reduction of rod-like Co{sub 3}O{sub 4} and Ag/Co{sub 3}O{sub 4} composites

Graphical abstract: The pure Co{sub 3}O{sub 4} and Ag/Co{sub 3}O{sub 4} composite with 5% Ag all exhibited rod-like morphology, and the microrods were actually composed of nanoparticles with mean size of 35 nm or so. - Highlights: • A facile route was designed to fabricate rod-like Co{sub 3}O{sub 4} and Ag/Co{sub 3}O{sub 4} composite nanomaterials. • Co{sub 3}O{sub 4} and Ag/Co{sub 3}O{sub 4} composite were modified on a GCE directly. • All samples exhibited enhanced catalytic property for p-nitrophenol reduction. - Abstract: Rod-like precursors of Co{sub 3}O{sub 4} and Ag/Co{sub 3}O{sub 4} composites with different Ag contents were synthesized via a co-precipitation method. Co{sub 3}O{sub 4} and Ag/Co{sub 3}O{sub 4} composite samples were fabricated by calcining each precursor at 400 °C for 3 h. The as-prepared samples were characterized by thermogravimetric analysis and differential thermal gravimetric analysis (TGA/DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM), and field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), respectively. Co{sub 3}O{sub 4} and Ag/Co{sub 3}O{sub 4} composites were used as electrocatalyst modified on a glassy carbon electrode for p-nitrophenol reduction in basic solution. The results showed that p-nitrophenol could be reduced effectively on the modified electrode. By comparison with a bare glassymore » carbon electrode, peak current increased markedly with Co{sub 3}O{sub 4} and Ag/Co{sub 3}O{sub 4} samples, and peak potential decreased obviously with Ag/Co{sub 3}O{sub 4} samples. Ag/Co{sub 3}O{sub 4} composites with 4% Ag exhibited the highest electrocatalytic activity for p-nitrophenol reduction.« less
Authors:
 [1] ;  [2] ; ;  [1]
  1. Department of Chemistry and Chemical Engineering, Huainan Normal University, Huainan 232001 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22290477
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 7; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT OXIDES; ELECTROCATALYSTS; ELECTROCHEMISTRY; NANOSTRUCTURES; NITROPHENOL; REDUCTION; SCANNING ELECTRON MICROSCOPY; SYNTHESIS; THERMAL GRAVIMETRIC ANALYSIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY