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A Fe3O4-based chemical sensor for cathodic determination of hydrogen peroxide

机译：基于Fe3O4的化学传感器，用于过氧化氢的阴极测定

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摘要

A new cathodic scheme for hydrogen peroxide (H2O2) measurement by Fe3O4-based chemical sensor was described. The unique characteristic of electrocatalytic property was firstly investigated by voltammetry. And then the amperometric response of H2O2 was measured at - 0.2 V (vs. Ag/AgCl) by Fe3O4 modified glassy carbon rotating disk electrode. The kinetic parameter was also calculated from Koutecky-Levich plot, and the value was 6.4 x 10(-4) cm s(-1) in pH 3 citrate buffer. In order to benefit the possible biomedical applications, Fe3O4/chitosan modified electrode was also investigated in this experiment. There were several characteristic enhancements by the coated chitosan thin film for H2O2 sensor. The calibration curves were found to be linear up to 4.0 and 5.0 mM (r = 0.999) in pH 3 and 7 with the detection limits of 7.6 and 7.4 mu M L-1 (S/N = 3). The stability was evaluated by the results of half-life time (t(50%)) for 9 months at room temperature and 24 months at 4 degrees C.
机译：描述了一种新的阴极方案，用于通过基于Fe3O4的化学传感器测量过氧化氢（H2O2）。首先通过伏安法研究了电催化性能的独特特性。然后通过Fe3O4修饰的玻璃碳旋转圆盘电极在-0.2 V（vs. Ag / AgCl）下测量H2O2的安培响应。动力学参数也是根据Koutecky-Levich图计算得出的，在pH 3柠檬酸盐缓冲液中的值为6.4 x 10（-4）cm s（-1）。为了使可能的生物医学应用受益，在该实验中还研究了Fe3O4 /壳聚糖修饰的电极。用于H2O2传感器的涂层壳聚糖薄膜具有一些特性增强。发现校准曲线在pH 3和7下至4.0和5.0 mM（r = 0.999）均为线性，检出限为7.6和7.4μM L-1（S / N = 3）。通过在室温下9个月和在4摄氏度下24个月的半衰期（t（50％））的结果来评估稳定性。

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