†College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
‡Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics (CAEP), Mianyang 612900, PR China.
ACS Appl Mater Interfaces. 2015 May 13;7(18):9526-33. doi: 10.1021/acsami.5b00884. Epub 2015 May 1.
In the present work, we described the facile hydrothermal fabrication of Mn2O3 nanoparticle-assembled hierarchical hollow spheres and their application for the electrochemical determination of hydrogen peroxide (H2O2). The composition and morphology of the as-prepared samples were well characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Because of the electrochemical responses toward H2O2, a novel nonenzymatic electrochemical sensor for the H2O2 determination based on Mn2O3 hollow spheres modified glassy carbon electrode was proposed. The electrochemical properties of the modified electrode were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. The modified electrode displayed distinct amperometric response to H2O2 in a wide concentration range 0.10-1276.5 μM, with a linear range of 0.10-126.5 μM and a detection limit of 0.07 μM (S/N = 3). It exhibited excellent analytical performance in terms of long-time stability, good reproducibility and acceptable anti-interference ability. In addition, it was applied for the H2O2 determination in real samples directly with acceptable accuracy and recovery, demonstrating its potential application in routine H2O2 analysis.
在本工作中，我们描述了 Mn2O3 纳米颗粒组装的分级空心球的简便水热法制备及其在过氧化氢（H2O2）电化学测定中的应用。通过粉末 X 射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和 X 射线光电子能谱（XPS）对所制备样品的组成和形貌进行了很好的表征。由于对 H2O2 的电化学响应，提出了基于 Mn2O3 空心球修饰玻碳电极的新型非酶电化学传感器用于测定 H2O2。通过循环伏安法、电化学阻抗谱和计时电流法研究了修饰电极的电化学性质。修饰电极对 H2O2 表现出明显的安培响应，在 0.10-1276.5 μM 的宽浓度范围内具有线性范围，线性范围为 0.10-126.5 μM，检测限为 0.07 μM（S/N = 3）。它在长时间稳定性、良好的重现性和可接受的抗干扰能力方面表现出优异的分析性能。此外，它可直接用于实际样品中 H2O2 的测定，具有可接受的准确性和回收率，表明其在常规 H2O2 分析中具有潜在的应用。
