Facile synthesis of a zeolitic imidazolate framework-8 with reduced graphene oxide hybrid material as an efficient electrocatalyst for nonenzymatic H2O2 sensing

Suling Yang; Ning Xia; Mengyu Li; Panpan Liu; Yuxin Wang; Lingbo Qu

doi:10.1039/c9ra02096a

Facile synthesis of a zeolitic imidazolate framework-8 with reduced graphene oxide hybrid material as an efficient electrocatalyst for nonenzymatic H₂O₂ sensing

RSC Adv. 2019 May 15;9(27):15217-15223. doi: 10.1039/c9ra02096a. eCollection 2019 May 14.

Authors

Suling Yang^{1

2}, Ning Xia^{1

2}, Mengyu Li^{1

2}, Panpan Liu^{1

2}, Yuxin Wang^{1

2}, Lingbo Qu^{1

2

3}

Affiliations

¹ College of Chemistry and Chemical Engineering, Anyang Normal University Anyang 455002 PR China yang_suling@163.com xianing82414@163.com +86 3722900040 +86 03722900040.
² Henan Key Laboratory of New Opto-electronic Functional Materials PR China.
³ College of Chemistry and Molecular Engineering, Zhengzhou University Zhengzhou 450001 PR China.

Abstract

A zeolitic imidazolate framework-8 (ZIF-8)/reduced graphene oxide (rGO) nanocomposite was formed by using an efficient synthetic method. The morphology and structure of the ZIF-8/rGO nanocomposite were characterized by scanning electron spectroscopy (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) mapping. The ZIF-8/rGO nanocomposites were immobilized on a carbon paste electrode (CPE) to construct a high-performance nonenzymatic electrochemical H₂O₂ sensor. A cyclic voltammetry (CV) study showed that the ZIF-8/rGO nanocomposites displayed better electrocatalytic activity toward H₂O₂ reduction compared to that of ZIF-8. An amperometric study indicated that the H₂O₂ sensor displayed high performance, which offered a low detection limit (0.05 μM) (S/N = 3), a high sensitivity (4.01 μA mM^-1 cm^-2), and a wide linear range (from 1.0 to 625 μM). An electrochemical reaction mechanism was proposed for H₂O₂ reduction on the ZIF-8/rGO/CPE. Importantly, the as-fabricated H₂O₂ sensor exhibited good reproducibility and excellent selectivity. Furthermore, the constructed high-performance sensor was utilized to monitor the H₂O₂ levels in real samples, and satisfactory results were obtained. These results demonstrated that the ZIF-8/rGO nanocomposite can be used as a good electrochemical sensor material in practical applications.