Abstract Functional nanostructured transition metal oxides hold great promise in catalysis based sensors due to their superb catalytic activity, good stability, ease of preparation and cost-effectiveness. In this work, MnO2 nanowires and MnO2/multi-walled carbon nanotubes (MWCNTs) nanocomposite were prepared via a simple hydrothermal method. The MnO2/MWCNTs nanocomposite was developed by deposition of MnO2 on MWCNTs surface, which have abundant hydrophilic groups facilitating ion-adsorption and nucleation process. The MWCNTs/MnO2 exhibited higher catalytic activity upon hydrogen peroxide (H2O2) electrooxidation, with reduced overpotential by 100 mV and 220 mV in contrast to those values of MWCNTs and MnO2 nanowires, respectively. Thus the MnO2/MWCNTs nanocomposite modified glass carbon electrode (GCE) enabled to detect H2O2 sensitively. Moreover, by incorporation of glucose oxidase (GOx), a glucose biosensor GOx/MnO2/MWCNTs/GCE was prepared. The as-proposed biosensor had wide linear range (5–200 μM and 0.2–1 mM) and a low detection limit of 2 μM (S/N = 3), which could be applicable to detect real sample with satisfying accuracy and reproducibility. Due to the superb electrochemical properties, the as-developed MnO2/MWCNTs nanocomposite is prospected in electrochemical sensor, electrocatalysis and supercapacitor.

中文翻译：

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基于MnO2/多壁碳纳米管的纳米复合材料具有增强的电催化活性，用于灵敏的安培葡萄糖生物传感

摘要 功能性纳米结构过渡金属氧化物由于其优异的催化活性、良好的稳定性、易于制备和成本效益，在基于催化的传感器中具有广阔的前景。在这项工作中，通过简单的水热法制备了 MnO2 纳米线和 MnO2/多壁碳纳米管 (MWCNTs) 纳米复合材料。MnO2/MWCNTs 纳米复合材料是通过在 MWCNTs 表面沉积 MnO2 开发的，其具有丰富的亲水基团，促进离子吸附和成核过程。MWCNTs/MnO2 在过氧化氢 (H2O2) 电氧化时表现出更高的催化活性，与 MWCNTs 和 MnO2 纳米线的这些值相比，过电位分别降低了 100 mV 和 220 mV。因此，MnO2/MWCNTs 纳米复合改性玻璃碳电极 (GCE) 能够灵敏地检测 H2O2。而且，通过掺入葡萄糖氧化酶（GOx），制备了葡萄糖生物传感器GOx/MnO2/MWCNTs/GCE。所提出的生物传感器具有较宽的线性范围（5-20​​0 μM 和 0.2-1 mM）和 2 μM 的低检测限（S/N = 3），可用于检测真实样品，并具有令人满意的准确度和重现性。由于优异的电化学性能，所开发的 MnO2/MWCNTs 纳米复合材料在电化学传感器、电催化和超级电容器方面具有广阔的前景。