Amperometric hydrogen peroxide sensor based on the use of CoFe2O4 hollow nanostructures

作者：Vasuki Karuppaiah; Babu Kaliyamoorthy Justice; Sheet Sunirmal; Siva Ganesan; Kim Ae Rhan; Yoo Dong Jin; Kumar Georgepeter Gnana

来源：Microchimica Acta, 2017, 184(8): 2579-2586.

DOI：10.1007/s00604-017-2227-y

• Transmission electron microscopy
• X-ray diffraction
• Cyclic voltammetry
• Electrocatalysis
• Non-enzymatic sensor

The authors report on the preparation of a hollowstructured cobalt ferrite (CoFe2O4) nanocomposite for use in a non-enzymatic sensor for hydrogen peroxide ( H2O2). Silica (SiO2) nanoparticles were exploited as template for the deposition of Fe3O4/CoFe2O4 nanosheets, which was followed by the removal of SiO2 template under mild conditions. This leads to the formation of hollow-structured Fe3O4/CoFe2O4 interconnected nanosheets with cubic spinel structure of high crystallinity. The material was placed on a glassy carbon electrode where it acts as a viable sensor for non-enzymatic determination of H2O2. Operated at a potential of -0.45 V vs. Ag/AgCl in 0.1 M NaOH solution, the modified GCE has a sensitivity of 17 nA mu M-1 cm(-2), a linear response in the range of 10 to 1200 mu M H2O2 concentration range, and a 2.5 mu M detection limit. The sensor is reproducible and stable and was applied to the analysis of spiked urine samples, where it provided excellent recoveries.

• 出版日期2017-8