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Cobalt Nanoparticles and Atomic Sites in Nitrogen-Doped Carbon Frameworks for Highly Sensitive Sensing of Hydrogen Peroxide

  • Li, Zehui
  • Liu, Rongji
  • Tang, Cheng
  • Wang, Zhuoya
  • Chen, Xiao
  • Jiang, Yuheng
  • Wang, Chizhong
  • Yuan, Yi
  • Wang, Wenbo
  • Wang, Dongbin
  • Chen, Shuning
  • Zhang, Xiaoyuan
  • Zhang, Qiang
  • Jiang, Jingkun
Publication Date
Aug 30, 2019
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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In situ monitoring of hydrogen peroxide (H2O2) during its production process is needed. Here, an electrochemical H2O2 sensor with a wide linear current response range (concentration: 5 x 10(-8) to 5 x 10(-2) m), a low detection limit (32.4 x 10(-9) m), and a high sensitivity (568.47 mu A mm(-1) cm(-2)) is developed. The electrocatalyst of the sensor consists of cobalt nanoparticles and atomic Co-N-x moieties anchored on nitrogen doped carbon nanotube arrays (Co-N/CNT), which is obtained through the pyrolysis of the sandwich-like [email protected] complex. More cobalt nanoparticles and atomic Co-N-x 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 approximate to 40 s) H2O2 produced in microbial fuel cells with only 50 mu L solution. Both the synthesis strategy and sensor design can be applied to other energy and environmental fields.

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