Graphene oxide-MnO₂ nanocomposite-modified glassy carbon electrode as an efficient sensor for H₂O₂

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• 作者：Hui-Li Xu ; Wei-De Zhang ; ^{zhangwd@scut.edu.cn}
• 关键词：MnO2 ; Graphene oxide ; Electroanalysis ; Nanowires ; Hydrogen peroxide
• 刊名：Chinese Chemical Letters
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：1
• 页码：143-148
• 全文大小：2293 K
• 卷排序：28

文摘

In this study, a new facile preparation method of nanocomposites consisting of graphene oxide and manganese dioxide nanowires (GO/MnO2 NWs) was developed. The morphology, structure and composition of the resulted products were characterized by transmission electron microscopy, X-ray diffraction and N2 adsorption and desorption. The GO/MnO2 nanocomposite was used as an electrode material for non-enzymatic determination of hydrogen peroxide. The proposed sensor exhibits excellent electrocatalytic performance for the determination of hydrogen peroxide in phosphate buffer solution (PBS, pH 7) at an applied potential of 0.75 V. The non-enzymatic biosensor for determination of hydrogen peroxide displayed a wide linear range of 4.90 μmol L−1–4.50 mmol L−1 with a correlation coefficient of 0.9992, a low detection limit of 0.48 μmol L−1 and a high sensitivity of 191.22 μA (mmol L−1)−1 cm−2 (signal/noise, S/N = 3). Moreover, the non-enzymatic biosensor shows an excellent selectivity.