Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 271, Issue -, Pages 247-255Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.05.070
Keywords
Hydrogen peroxide; Sensor; Self-powered; Bioelectrochemical; CoMn2O4
Funding
- National Natural Science Foundation of China [51708080]
- China Postdoctoral Science Foundation [2017M611212]
- Fundamental Research Funds for the Central Universities [3132017096, 3132018178]
- Higher Education Development Fund (Collaborative Innovation Center) of Liaoning Province, China [20110216004]
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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.
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