Facile construction of Mn3O4-MnO2 hetero-nanorods/graphene nanocomposite for highly sensitive electrochemical detection of hydrogen peroxide. (1st April 2016)

• Record Type: Journal Article
• Authors: Zeng, Fanyan; Pan, Yang; Yang, Yong; Li, Qinliang; Li, Gangyong; Hou, Zhaohui; Gu, Gang
• Is Part Of: Electrochimica acta. Volume 196(2016)
• Page Start: 587
• Page End: 596
• Publication Date: 2016-04-01
• Subjects: Graphene -- Hetero-nanorods -- Electrochemical sensor -- Detectability; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.03.031
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: The hetero-nanorods based on multiple valencies in one material bring about a remarkable synergistic effect and markedly enhanced electrocatalytic activity for the reduction of H2 O2 . Taking advantage of the electro-reduction of hetero-nanorods and the high conductivity and large surface area of GS, MM-HNRS/GS exhibits excellent sensor performance in non-enzymatic and noble metal-free detection of H2 O2 . Highlights: MM-HNRS with multiple metal-valencies are constructed in one material. A facile strategy is developed to fabricate the MM-HNRS/GS nanocomposite. MM-HNRS bring about remarkably electrocatalytic synergistic effects. MM-HNRS/GS exhibits excellent sensor performance in H2 O2 detection. Abstract: Semiconductor-based hetero-structure with desired compositions and/or morphologies can modulate the properties of materials and satisfy their potential applications. However, there is still a paucity of reports on the construction of the hetero-nanorod of metal oxides with multiple valencies in one material. In this work, the Mn3 O4 -MnO2 hetero-nanorods/graphene nanocomposite (MM-HNRS/GS) is successfully fabricated by combining a hydrothermal method (for MnOx nanorods), a wet chemical process (for composites) and a thermal treatment (for hetero-structures), and X-ray diffraction is adopted to demonstrate the formation process. Electrochemical results reveal that the hetero-structure based on Mn3 O4 and MnO2 brings about a remarkable synergistic effect and markedly enhanced electrocatalytic activity for the reduction of H2 O2 . Taking advantage of the electro-reduction of hetero-nanorods and the high conductivity and large surface area of GS, MM-HNRS/GS exhibits excellent sensor performance in non-enzymatic and noble metal-free detection of H2 O2, including a fast amperometric response (within 3 s), high sensitivity (1443 μA mM −1 cm −2 ) and low detection limit (0.16 μM) (S/N = 3). In addition, good selectivity, reproducibility and stability are achieved. Considering the high sensitivity as well as the facile and low-cost preparation process, we expect this nanocomposite a promising electrocatalyst for electrochemical sensors.