State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, P. R. China.
CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Small. 2020 Apr;16(15):e1902860. doi: 10.1002/smll.201902860. Epub 2019 Aug 30.
In situ monitoring of hydrogen peroxide (H O ) during its production process is needed. Here, an electrochemical H O sensor with a wide linear current response range (concentration: 5 × 10 to 5 × 10 m), a low detection limit (32.4 × 10 m), and a high sensitivity (568.47 µA mm cm ) is developed. The electrocatalyst of the sensor consists of cobalt nanoparticles and atomic Co-N moieties anchored on nitrogen doped carbon nanotube arrays (Co-N/CNT), which is obtained through the pyrolysis of the sandwich-like urea@ZIF-67 complex. More cobalt nanoparticles and atomic Co-N as active sites are exposed during pyrolysis, contributing to higher electrocatalytic activity. Moreover, a portable screen-printed electrode sensor is constructed and demonstrated for rapidly detecting (cost ≈40 s) H O produced in microbial fuel cells with only 50 µL solution. Both the synthesis strategy and sensor design can be applied to other energy and environmental fields.
在过氧化氢（H2O2）的生产过程中需要对其进行原位监测。在此，开发了一种具有宽线性电流响应范围（浓度：5×10-6至 5×10-5M）、低检测限（32.4×10-6M）和高灵敏度（568.47 µA mm cm-2）的电化学 H2O2传感器。传感器的电催化剂由钴纳米粒子和原子 Co-N 部分锚定在氮掺杂碳纳米管阵列上（Co-N/CNT）组成，该结构是通过三明治状尿素@ZIF-67 复合物的热解得到的。在热解过程中会暴露出更多的钴纳米粒子和原子 Co-N 作为活性位点，从而提高了电催化活性。此外，构建并展示了一种便携式丝网印刷电极传感器，用于快速检测微生物燃料电池中仅用 50 µL 溶液产生的 H2O2（成本约 40 s）。该合成策略和传感器设计可以应用于其他能源和环境领域。
