A robust Mn@FeNi-S/graphene oxide nanocomposite as a high-efficiency catalyst for the non-enzymatic electrochemical detection of hydrogen peroxide. Issue 10 (28th February 2020)

• Record Type: Journal Article
• Authors: Manavalan, Shaktivel; Ganesamurthi, Jaysiva; Chen, Shen-Ming; Veerakumar, Pitchaimani; Murugan, Keerthi
• Is Part Of: Nanoscale. Volume 12:Issue 10(2020)
• Page Start: 5961
• Page End: 5972
• Publication Date: 2020-02-28
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr09148c
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Synthesis procedure of a Mn@FeNi-S/GO nanocomposite and its characterization and electrocatalytic performance. Abstract : Exploring high-efficiency, stable, and cost-effective electrocatalysts for electrochemical activities is greatly desirable and challenging. Herein, a newly designed hybrid catalyst with manganese-doped FeNi-S encapsulated into graphene oxide (Mn@FeNi-S/GO) with unprecedented electrocatalytic activity was developed by simple one-step heat treatment followed by sonication. X-ray powder diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and N2 sorption isotherm demonstrated the successful formation of Mn@FeNi-S/GO. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) further confirmed the kinetic-favourable adsorption of hydrogen peroxide (H2 O2 ) onto the surface sites of Mn@FeNi-S/GO. Additionally, the synergetic effects between Mn@FeNi-S and GO are regarded as significant contributors to an efficient electron transfer path, and they promote the capture of H2 O2 in hybrid catalysts. Under an optimal condition, a biosensor-based Mn@FeNi-S/GO electrode exhibits a high sensitivity of 8.929 μA μM −1 cm −2 and a detection limit of 8.84 nM with a wide detection range for H2 O2 and excellent selectivity; also, it is capable of online monitoring H2 O2 derived from apple juice and human blood serum.