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Title: Hydrothermal synthesis of urchin-like Co{sub 3}O{sub 4} nanostructures and their electrochemical sensing performance of H{sub 2}O{sub 2}

Nanostructured tricobalt tetraoxide, Co{sub 3}O{sub 4}, was hydrothermally synthesized starting from cobalt dichloride hexahydrate (CoCl{sub 2}·6H{sub 2}O) and urea (H{sub 2}NCONH{sub 2}) as precursor and polyethylene glycol-400 (PEG-400) as a structure-directing agent. Uniform urchin-like nanostructures were hydrothermally obtained at 150 °C for 16 h, and the Co{sub 3}O{sub 4} morphology did not collapse after a subsequent calcination at 300 °C for 2 h. XRD measurements indicated that the average sizes of Co{sub 3}O{sub 4} particles prior and after heating at 300 °C are 64 and 44 nm, respectively. This material has been successfully used for the nanostructuration of screen-printed carbon electrodes (SPCEs) which were used for the sensitive electrochemical detection of hydrogen peroxide (H{sub 2}O{sub 2}). The sensor is endowed with a large dynamic range (0.1 to 50 µM) and a limit of detection of 0.145 µM. The as obtained results show that the Co{sub 3}O{sub 4} nanomaterial could be a candidate to be used as sensors for the detection of analytes. - Graphical abstract: The nanowires appear to have a common center and grow to the outside along the radial direction. - Highlights: • Nanostructured was hydrothermally prepared using PEG-400. • Uniform urchin-like Co{sub 3}O{sub 4} nanostructures were hydrothermallymore » obtained. • X-ray diffraction showed a cubic structure after calcinations process. • Nanostructured Co{sub 3}O{sub 4} was used for the sensitive electrochemical detection of H{sub 2}O{sub 2.} • The sensor is endowed with a large dynamic range 0.1 to 50 µM.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [3]
  1. Laboratoire des Matériaux Utiles, INRAP, Technopôle Sidi-Thabet, Tunis 2020 (Tunisia)
  2. Université de Tunis El-Manar, Faculté of Sciences, Laboratoire de Chimie Analytique et Electrochimie, Campus Universitaire de Tunis El-Manar, 2092 Tunis (Tunisia)
  3. Laboratoire Matériaux Traitement et Analyse INRAP, Technopôle Sidi-Thabet, Tunis 2020 (Tunisia)
Publication Date:
OSTI Identifier:
22486741
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 228; Other Information: Copyright (c) 2015 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:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CALCINATION; CARBON; COBALT CHLORIDES; COBALT OXIDES; ELECTROCHEMISTRY; ELECTRODES; HYDRATES; HYDROGEN PEROXIDE; HYDROTHERMAL SYNTHESIS; MORPHOLOGY; NANOWIRES; POLYETHYLENE GLYCOLS; SENSORS; UREA; X-RAY DIFFRACTION