Direct detection of charge and discharge process in supercapacitor by fiber-optic LSPR sensors

Siyu Qian, Xinlong Chen, Shiyu Jiang, Qiwen Pan, Yachen Gao, Lei Wang, Wei Peng, Shanjun Liang, Jie Zhu, Shengchun Liu

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Supercapacitors with high power density, ultralong lifespan and wide range operating temperature have drawn significant attention in recent years. However, monitoring the state of charge in supercapacitors in a cost-effective and flexible way is still challenging. Techniques such as transmission electron microscopy and X-ray diffraction can analyze the characteristics of supercapacitor well. But with large size and high price, they are not suitable for daily monitoring of the supercapacitors' operation. In this paper, a low cost and easily fabricated fiber-optic localized surface plasmon resonance (LSPR) probe is proposed to monitor the state of charge of the electrode in a supercapacitor. The Au nanoparticles were loading on the fiber core as LSPR sensing region. In order to implant the fiber in the supercapacitor, a reflective type of fiber sensor was used. The results show that this tiny fiber-optic LSPR sensor can provide online monitoring of the state of charge during the charging and discharging process in situ. The intensity shift in LSPR sensor has a good linear relationship with the state of charge calculated by standard galvanostatic charging and discharging test. In addition, this LSPR sensor is insensitive to the temperature change, presenting a great potential in practical applications.

Original languageEnglish
Pages (from-to)1071-1079
Number of pages9
Issue number5
Publication statusPublished - 1 May 2020


  • fiber-optic LSPR sensors
  • localized surface plasmon resonance
  • state of charge monitoring
  • supercapacitor


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