A Flexible Enzymeless Glucose Sensor via Electrodepositing 3D Flower-like CoS onto Self-Supporting Graphene Tape Electrode

doi:10.13208/j.electrochem.210421

Abstract

Abstract:

Three-dimensional (3D) nanostructural Flower-like cobalt sulfide (CoS) on flexible self-supporting graphene tape electrode (GTE) with remarkably electrocatalytic activity toward glucose was successfully prepared by electrodeposition. Structural characterizations revealed that the electrodeposited CoS was highly dispersed on GTE as an active material. The fabricated binder-free and self-standing CoS/GTE shows a good linear response in the range of 0.025 ~ 1.0 mmol·L^-1, reaching a high glucose sensitivity value of 323.3 μA·(mmol·L ^-1)^-1·cm^-2 and a low detection limit of 8.5 μmol·L ^-1 (S/N = 3). Moreover, the as-prepared sensor was well applied for glucose determination in human serum. Thus, the self-supporting, binder-free, low-cost sensor has good potential as a promising device for practical quantitative analysis of glucose in human serum.

Key words: flexible electrode, flower-like CoS, electrodeposition, glucose sensor

Jiang Li, Zuo-Peng Li, Yun-Feng Bai, Su-Xing Luo, Yong Guo, Ya-Yan Bao, Rong Li, Hai-Yan Liu, Feng Feng. A Flexible Enzymeless Glucose Sensor via Electrodepositing 3D Flower-like CoS onto Self-Supporting Graphene Tape Electrode[J]. Journal of Electrochemistry, 2022, 28(1): 2104211.

Figures/Tables 7

References 47

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Electrode material	Method	Sensitivity (μA·cm^-2·(mmol·L^-1)^-1)	Linear range/ (mmol·L^-1)	Test Potential/V	Detection Limit/ (μmol·L^-1)	Flexible substrate	Ref.
CoS	Hydrothermal method	139.35; 28.44	0.005 ~ 1.10; 1.20 ~ 10.20	0.20	1.5	No	[20]
CoS/3D porous carbon skeleton	Hydrothermal method	679	0.01 ~ 0.9	0.45	2	No	[21]
Co_xS_y/ rGO-PEDOT	CV	113.46	0.0002 ~ 1.380	0.65	0.079	No	[22]
Nickel-cobalt phosphate	Hydrothermal method	302.99	0.002 ~ 4.47	0.55	0.4	No	[42]
NiCo₂S₄/Ni/CFP	CV	283	0.0005 ~ 6	0.45	0.05	Yes	[43]
3D graphene frameworks/ Co₃O₄ composites	Sol-gel	122.16	0.025 ~ 0.080	0.58	0.157	No	[44]
CoTsPc	-	122.5	0.01 ~ 6.34	-	0.14	No	[45]
CoOOH nanosheets	Redox reaction	341	0.03 ~ 0.7	0.4	30.9	No	[46]
CoP	Precipitation method	116.8	0.5 ~ 5.5		9	No	[47]
CoS/GTE	CA	323.3	0.025 ~ 1.0	0.5	8.5	Yes	This work

Spiked/ (μmol·L^-1)	Detected/(μmol·L^-1)	RSD/%	Mean recovery/%
25	25.63	3.92	102.5
50	48.25	4.84	96.5
75	72.55	4.51	96.7