Facile construction of Mn3O4-MnO2 hetero-nanorods/graphene nanocomposite for highly sensitive electrochemical detection of hydrogen peroxide
2016; Elsevier BV; Volume: 196; Linguagem: Inglês
10.1016/j.electacta.2016.03.031
ISSN1873-3859
AutoresFanyan Zeng, Yang Pan, Yong Yang, Qinliang Li, Gangyong Li, Zhaohui Hou, Gang Gu,
Tópico(s)Conducting polymers and applications
ResumoSemiconductor-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 Mn3O4-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 Mn3O4 and MnO2 brings about a remarkable synergistic effect and markedly enhanced electrocatalytic activity for the reduction of H2O2. 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 H2O2, 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.
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