Electrochemical co-preparation of cobalt sulfide/reduced graphene oxide composite for electrocatalytic activity and determination of H2O2 in biological samples

Subbiramaniyan Kubendhiran; Balamurugan Thirumalraj; Shen-Ming Chen; Chelladurai Karuppiah

doi:10.1016/j.jcis.2017.08.087

Electrochemical co-preparation of cobalt sulfide/reduced graphene oxide composite for electrocatalytic activity and determination of H₂O₂ in biological samples

J Colloid Interface Sci. 2018 Jan 1:509:153-162. doi: 10.1016/j.jcis.2017.08.087. Epub 2017 Aug 30.

Authors

Subbiramaniyan Kubendhiran¹, Balamurugan Thirumalraj¹, Shen-Ming Chen², Chelladurai Karuppiah³

Affiliations

¹ Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, Republic of China.
² Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, Republic of China. Electronic address: smchen78@ms15.hinet.net.
³ Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei City 24301, Taiwan, Republic of China.

PMID: 28898735
DOI: 10.1016/j.jcis.2017.08.087

Abstract

In this work, we describe a simple approach for the preparation of cobalt sulfide/reduced graphene oxide (CoS/RGO) nanohybrids via single step electrochemical method. The electrocatalytic activity of the CoS/RGO nanohybrids was evaluated towards the detection hydrogen peroxide (H₂O₂). The physiochemical properties of the prepared composite was characterized by means of field emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and X-ray powder diffraction patterns. The CoS/RGO modified electrode showed superior electrocatalytic activity towards the detection of H₂O₂. The amperometric (i-t) studies revealed that the CoS/RGO performed well by attaining a wide linear response range of H₂O₂ from 0.1 to 2542.4μM with a lower detection limit 42nM and the sensitivity of 2.519μAμM^-1cm^-2. Meanwhile, the CoS/RGO nanohybrids exhibited good selectivity, rapid and stable response towards H₂O₂. The practical applicability of the sensor was successfully evaluated in human serum and urine samples with satisfactory recoveries.

Keywords: Cobalt sulfide; Electrocatalytic activity; Electrochemical method; H(2)O(2) sensor; Real sample analysis; Reduced graphene oxide.

MeSH terms

Catalysis
Cobalt / chemistry*
Electrochemical Techniques / methods*
Electrodes
Graphite / chemistry*
Humans
Hydrogen Peroxide / analysis*
Sensitivity and Specificity
Surface Properties

Substances

graphene oxide
Cobalt
Graphite
Hydrogen Peroxide
cobaltous sulfide