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Abstract：
Conventional electrochemical sensors use voltammetric and amperometric methods with external power supply and modulation systems, which hinder the flexibility and application of the sensors. To avoid the use of an external power system and to minimize the number of electrochemical cell components, a self-powered electrochemical sensor (SPES) for hydrogen peroxide was investigated here. Iron phthalocyanine, an enzyme mimetic material, and Ni were used as a cathode catalyst and an anode material, respectively. The properties of the iron phthalocyanine catalyst modified by graphene nanoplatelets (GNPs) were investigated. Open circuit potential tests demonstrated the feasibility of this system. The GNP-modulated interface helped to solve the problems of aggregation and poor conductivity of iron phthalocyanine and allowed for the achievement of the best analytical characteristics of the self-powered H2O2 sensor with a low detection limit of 0.6 µM and significantly higher sensitivity of 0.198 A/(M·cm2) due to the enhanced electrochemical properties. The SPES demonstrated the best performance at pH 3.0 compared to pH 7.4 and 12.0. The sensor characteristics under the control of external variable load resistances are discussed and the cell showed the highest power density of 65.9 μW/cm2 with a 20 kOhm resistor. The practical applicability of this method was verified by the determination of H2O2 in blood serum.
摘要：
传统的电化学传感器使用伏安法和安培法与外部电源和调制系统，这阻碍了传感器的灵活性和应用。为了避免使用外部电源系统并最大程度地减少电化学电池组件的数量，本文研究了过氧化氢的自供电电化学传感器（SPES）。酞菁铁,一种酶模拟材料，和Ni用作阴极催化剂和阳极材料，分别。研究了石墨烯纳米片（GNPs）修饰的酞菁铁催化剂的性能。开路电位测试证明了该系统的可行性。GNP调制的界面有助于解决铁酞菁的聚集和导电性差的问题，并允许实现自供电H2O2传感器的最佳分析特性，该传感器具有0.6µM的低检测限和显着更高的灵敏度由于增强的电化学性能而达到0.198A/（M·cm2）。与pH7.4和12.0相比,SPES在pH3.0表现出最佳性能。讨论了在外部可变负载电阻控制下的传感器特性，该电池在使用20kOhm电阻器的情况下显示出65.9μW/cm2的最高功率密度。经由过程血清中H2O2的测定验证了该办法的现实适用性。
