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<p>Reactive oxygen species (ROS) play a crucial role in various biological processes, and their accurate detection is essential for biomedical applications. Although various types of ROS sensors are explored, there are demands for sensors that can be applied to wearable and implantable devices to measure the concentration of ROS in the human body. In this study, a self-powered ROS sensor is explored based on enzymatic biofuel cell (EBFC) to selectively detect oxygen (O<sub>2</sub>) and hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>). Furthermore, this ROS sensor utilizes buckypaper and polydimethylsiloxane (BP@PDMS)-based electrode. For anode, glucose dehydrogenase is immobilized on BP@PDMS, while as cathode, both bilirubin oxidase (BOD) and horseradish peroxidase (HRP) are immobilized on BP@PDMS, and the two cathodes detect O<sub>2</sub> and H<sub>2</sub>O<sub>2</sub>, respectively. They show good sensitivity for each O<sub>2</sub> and H<sub>2</sub>O<sub>2</sub> fuel, while the sensitivity is quantified by measuring their reduction current density. Furthermore, polarization curves of full cell prepared with one anode and two cathodes show maximum power density of 129&#xa0;µW/cm<sup>2</sup> at 0.4&#xa0;V for O<sub>2</sub> and 440&#xa0;µW/cm<sup>2</sup> at 0.5&#xa0;V for H<sub>2</sub>O<sub>2</sub>, and this proves desirable step reaction occurs within the given concentration range of fuels, which are 25–100&#xa0;cc/min (O<sub>2</sub>) and 1–3&#xa0;mM (H<sub>2</sub>O<sub>2</sub>). Furthermore, the flexible design of self-powered ROS sensor explored in this study highlights its possibility for integration into wearable and implantable devices, while this study proves that ROS sensor adopting EBFC platform can show high sensitivity and selectivity, and excellent adaptability for associated applications.</p>

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A Self-Powered Dual ROS Sensor Adopting Biofuel Cell Platform for Real-Time and Selective Monitoring of Oxygen and Hydrogen Peroxide

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Joonyoung Lee,
  • Yongchai Kwon

摘要

Reactive oxygen species (ROS) play a crucial role in various biological processes, and their accurate detection is essential for biomedical applications. Although various types of ROS sensors are explored, there are demands for sensors that can be applied to wearable and implantable devices to measure the concentration of ROS in the human body. In this study, a self-powered ROS sensor is explored based on enzymatic biofuel cell (EBFC) to selectively detect oxygen (O2) and hydrogen peroxide (H2O2). Furthermore, this ROS sensor utilizes buckypaper and polydimethylsiloxane (BP@PDMS)-based electrode. For anode, glucose dehydrogenase is immobilized on BP@PDMS, while as cathode, both bilirubin oxidase (BOD) and horseradish peroxidase (HRP) are immobilized on BP@PDMS, and the two cathodes detect O2 and H2O2, respectively. They show good sensitivity for each O2 and H2O2 fuel, while the sensitivity is quantified by measuring their reduction current density. Furthermore, polarization curves of full cell prepared with one anode and two cathodes show maximum power density of 129 µW/cm2 at 0.4 V for O2 and 440 µW/cm2 at 0.5 V for H2O2, and this proves desirable step reaction occurs within the given concentration range of fuels, which are 25–100 cc/min (O2) and 1–3 mM (H2O2). Furthermore, the flexible design of self-powered ROS sensor explored in this study highlights its possibility for integration into wearable and implantable devices, while this study proves that ROS sensor adopting EBFC platform can show high sensitivity and selectivity, and excellent adaptability for associated applications.