Synthesis and electrochemical properties of Co3O4-rGO/CNTs composites towards highly sensitive nitrite detection

A sensitive electrochemical sensor based on cobalt oxide decorated reduced graphene oxide and carbon nanotubes (Co3O4-rGO/CNTs) has been successfully fabricated towards nitrite detection. Cyclic voltammetry and potential amperometry experiments were conducted on Co3O4-rGO/CNTs electrochemical sensor...

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Bibliographic Details
Published in:	Applied surface science 2019-08, Vol.485, p.274-282
Main Authors:	Zhao, Zhenting, Zhang, Jun, Wang, Wenda, Sun, Yongjiao, Li, Pengwei, Hu, Jie, Chen, Lin, Gong, Weiping
Format:	Article
Language:	eng
Subjects:	Carbon nanotubes Cobalt oxide Electrochemical sensor Nitrite Reduced graphene oxide
Online Access:	Get full text
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Summary:	A sensitive electrochemical sensor based on cobalt oxide decorated reduced graphene oxide and carbon nanotubes (Co3O4-rGO/CNTs) has been successfully fabricated towards nitrite detection. Cyclic voltammetry and potential amperometry experiments were conducted on Co3O4-rGO/CNTs electrochemical sensor to investigate the electrochemical sensing performances. Several important electrochemical sensor parameters have been evaluated for nitrite oxidation, such as pH, modified amounts and mass ratio of electrode modified materials. The measured results shows that the as-prepared gas sensor exhibits a high sensitivity of 0.408 μA·μM−1·cm−2 (0.1 μM to 8 mM), linearly proportional to nitrite concentrations in the range of 8 mM to 56 mM and a low detection limit of 0.016 μM. Meanwhile, the Co3O4-rGO/CNTs/GCE sensor also displays excellent anti-interference ability and good long-term stability. Furthermore, the proposed sensor was also applied to determine the nitrite level in real samples with satisfactory recovery, which implies its feasibility for practical application. A highly sensitive nitrite electrochemical sensor was fabricated by using carbon nanotubes and reduced graphene oxide composite film (rGO/CNTs), which was functionalized with cobalt oxide nanostructures (Co3O4). [Display omitted] •The influence of the mass percentages of Co3O4, CNTs and rGO were investigated.•The optimized sensor exhibited outstanding performance.•The as-synthesized sensor shows great application potential for nitrite detection.
ISSN:	0169-4332 1873-5584