Insight into the Contact Impedance between the Electrode and the Skin Surface for Electrophysical Recordings

Liangtao Yang, Lu Gan, Zhenggang Zhang, Zhilin Zhang, Hui Yang, Yi Zhang, Jinglong Wu

Research output: Contribution to journalArticlepeer-review


To obtain a performance improved dry electrode for bioelectrical activity detection is still a challenge, which is mainly due to the poor fundamental understanding on the impedance of the electrode-skin interface. Herein, the impedance between the electrode and the skin interface of three types of electrodes, which are the wet electrode, semidry electrode, and dry electrode, is investigated with electrochemical impedance spectroscopy combined with the spectra fitting technique. The parameters of performance duration, potential, and frequency associated with the impedance are explored for these three types of electrodes. The overall impedance is roughly constant within the performance duration and the potential applied in this study. Along with the frequency decreases, the impedance of the dry electrode reduces faster and is more complicated compared with the other two types of electrodes. Moreover, the results computed with the equivalent circuits show that the charge transfer resistance is additionally present compared to the wet and semidry electrodes. This large and additional charge transfer resistance may explain its relatively poorer electrophysiological properties.

Original languageEnglish
Pages (from-to)13906-13912
Number of pages7
JournalACS Omega
Issue number16
Publication statusPublished - Apr 26 2022
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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