A novel self-powered bioelectrochemical sensor based on CoMn2O4 nanoparticle modified cathode for sensitive and rapid detection of hydrogen peroxide

作者:Liu, Weifeng; Zhou, Zihao; Yin, Lin; Zhu, Yimin*; Zhao, Jiao; Zhu, Bin; Zheng, Libiao; Jin, Qi; Wang, Li
来源:Sensors and Actuators B: Chemical , 2018, 271: 247-255.
DOI:10.1016/j.snb.2018.05.070

摘要

The traditional (bio)electrochemical sensors for hydrogen peroxide (H2O2) detection require expensive external power sources which restricts their practicability. In this research, a novel self-powered bioelectrochemical sensor using bioanode as the electrical supplier and CoMn2O4 nanoparticle modified graphite cathode (CoMn2O4@GE) as the sensing element was developed for H2O2 determination. Electrochemical tests revealed that the CoMn2O4@GE exhibited attractive electrocatalytic activity towards H2O2 reduction, due to the large catalyst surface area and abundant Mn3+/Mn2+ and Co3+/Co2+ electroactive sites. Under the optimized conditions (flow rate 5 mL min(-1), pH 7.0) and external load of 300 Omega, the proposed sensor demonstrated a wide linear detection range between 1 and 1000 mM with a high sensitivity of 13.2 mu A mM(-1), a detection limit of 40.2 mu M (S/N = 3) and a fast response time within 5 s. Furthermore, the sensor presented good reproducibility, acceptable selectivity and excellent long-time stability. This study will provide a new approach for sensitive, rapid, in situ, and real-time monitoring of H2O2 for wide range applications.