In Situ Preparation and Glucose Sensing Property of Ternary NiO/Ni/C Microspheres

doi:10.15541/jim20160306

Abstract

Abstract:

Ternary NiO/Ni/C microspheres was obtained by calcination of the precursor Ni(OH)₂/C in pure nitrogen. The precursor was prepared via an one-pot hydrothermal synthesis technology using glucose, nickel chloride and urea. Scanning electron microscope (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray energy dispersive (EDS), and Raman were used to characterize the morphology and structure of the sample. Results show that the NiO/Ni/C microspheres have a coral-like structure with diameter of about 1.7 μm, and the crystalline phase of Ni and NiO are cubic. Electrochemical behavior and sensing property of ternary NiO/Ni/C microspheres composites were studied via cyclic voltammetry and amperometric method. When the Ni/NiO molar ratio is 0.19, the ternary NiO/Ni/C microspheres have excellent glucose sensor performance with a sensitivity of 241.09 μA·mmol/(L·cm²) in a range of 10-5.05 mmol/L, and a detecting limit of 10 μmol/L. Furthermore, the sensor has good stability and anti-interference ability.

Key words: microspheres, ternary composites, glucose, electrochemical sensor

CLC Number:

TQ174

QIN Dong-Yu, HE Xiao-Long, NIE Qiu-Lin, YIN Hao-Yong, YUAN Qiu-Li. In Situ Preparation and Glucose Sensing Property of Ternary
NiO/Ni/C Microspheres[J]. Journal of Inorganic Materials, 2017, 32(3): 313-318.

Figures/Tables 10

Fig. 1 XRD patterns of NiO/C(a), NiO/Ni/C-1(b), NiO/ Ni/ C-2(c), and NiO/Ni/C-3(d)

Fig. 2 Raman spectrum of NiO/Ni/C-2 sample

Fig. 3 SEM images of NiO/C (a), NiO/Ni/C-1 (b), NiO/Ni/C-2 (c), and NiO/Ni/C-3 (d), as well as enlarged image of NiO/Ni/C-2 (e), and its EDS pattern of NiO/Ni/C-2 (f)

Fig. 4 TEM (a) and HRTEM(b) images of NiO/Ni/C-2

Fig. 5 CV curves of different samples at 1 mmol/L glucose solution

Fig. 6 EIS spectra of different samples

Fig. 7 CV of NiO/Ni/C-2/GCE in glucose solution with different concentrations at scan rate of 50 mV/s

Fig. 8 i-t curves of NiO/C (a) ,NiO/Ni/C-1 (b), NiO/Ni/C-2 (c) and NiO/Ni/C-3 (d) glucose sensorsInset shows linear calibration of NiO/Ni/C-2 sensors between current response and glucose concentration

Fig. 9 Interference test of NiO/Ni/C-2 glcose sensor

Table 1 Determination of glucose recovery

Spiked/(mmol·L^-1)	Found/(mmol·L^-1)	Recovery/%
0.21	0.20	95.0
0.41	0.42	104.8
0.61	0.63	109.5
0.81	0.82	104.7

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