Next Article in Journal
Polymerization-Induced Phase Segregation and Self-Assembly of Siloxane Additives to Provide Thermoset Coatings with a Defined Surface Topology and Biocidal and Self-Cleaning Properties
Previous Article in Journal
Effects of Divacancy and Extended Line Defects on the Thermal Transport Properties of Graphene Nanoribbons
Open AccessArticle

Co2TiO4/Reduced Graphene Oxide Nanohybrids for Electrochemical Sensing Applications

1
Redox Processes Research Centre (CiPRex), Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Sergio Livingstone 1007, Independencia, Santiago 8380492, Chile
2
Laboratorio de Fisicoquímica y Electroquímica del estado Sólido, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Libertador Bernardo O’Higgins n° 3363, Santiago 9160000, Chile
3
INFIQC, Departamento de Físicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba 5000, Argentina
4
Instituto de Química Física Rocasolano, CSIC, Calle Serrano 119, 28006 Madrid, Spain
5
Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, UK
6
Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago 8380494, Chile
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(11), 1611; https://doi.org/10.3390/nano9111611
Received: 30 September 2019 / Revised: 1 November 2019 / Accepted: 8 November 2019 / Published: 13 November 2019
For the first time, the synthesis, characterization, and analytical application for hydrogen peroxide quantification of the hybrid materials of Co2TiO4 (CTO) and reduced graphene oxide (RGO) is reported, using in situ (CTO/RGO) and ex situ (CTO+RGO) preparations. This synthesis for obtaining nanostructured CTO is based on a one-step hydrothermal synthesis, with new precursors and low temperatures. The morphology, structure, and composition of the synthesized materials were examined using scanning electron microscopy, X-ray diffraction (XRD), neutron powder diffraction (NPD), and X-ray photoelectron spectroscopy (XPS). Rietveld refinements using neutron diffraction data were conducted to determine the cation distributions in CTO. Hybrid materials were also characterized by Brunauer–Emmett–Teller adsorption isotherms, Scanning Electron microscopy, and scanning electrochemical microscopy. From an analytical point of view, we evaluated the electrochemical reduction of hydrogen peroxide on glassy carbon electrodes modified with hybrid materials. The analytical detection of hydrogen peroxide using CTO/RGO showed 11 and 5 times greater sensitivity in the detection of hydrogen peroxide compared with that of pristine CTO and RGO, respectively, and a two-fold increase compared with that of the RGO+CTO modified electrode. These results demonstrate that there is a synergistic effect between CTO and RGO that is more significant when the hybrid is synthetized through in situ methodology. View Full-Text
Keywords: Hybrid materials; Co2TiO4; reduced graphene oxide; ex situ synthesis; in situ synthesis; H2O2 detection; electrochemical sensors Hybrid materials; Co2TiO4; reduced graphene oxide; ex situ synthesis; in situ synthesis; H2O2 detection; electrochemical sensors
Show Figures

Graphical abstract

MDPI and ACS Style

Venegas, C.J.; Gutierrez, F.A.; Eguílaz, M.; Marco, J.F.; Reeves-McLaren, N.; Rivas, G.A.; Ruiz-León, D.; Bollo, S. Co2TiO4/Reduced Graphene Oxide Nanohybrids for Electrochemical Sensing Applications. Nanomaterials 2019, 9, 1611.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop