Ion transport in porous carbon electrode for supercapacitors probed by electrochemical quartz crystal microbalance

2020 ◽  
Vol 356 ◽  
pp. 136780
Author(s):  
Yinguang Chai ◽  
Zhiqiu Hu ◽  
Wenshan Jia ◽  
Hengxing Ji
Keyword(s):  
Ion Transport ◽  
Quartz Crystal Microbalance ◽  
Porous Carbon ◽  
Quartz Crystal ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Carbon Electrode ◽  
Porous Carbon Electrode

scholarly journals Deconvoluting and Quantifying the Real-time Fluxes and Ionic Currents of Various Species Using In Situ Electrochemical Quartz Crystal Microbalance Measurements

2021 ◽  
Author(s):  
Kai Zheng ◽  
Yongqiu Xian ◽  
Zifeng LIN
Keyword(s):  
Real Time ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Ionic Current ◽  
Ionic Currents ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Cyclic Voltammograms ◽  
Supercapacitor Electrode ◽  
The Real ◽  
Porous Carbon Electrode

Electrochemical quartz crystal microbalance (EQCM) is a powerful technique to screen the gravimetric response of electrochemical electrodes. In this study, a straightforward mathematical method is proposed for extracting and deconvoluting the real-time fluxes and ionic currents of two species based on the EQCM measurement results. We creatively propose the concept of flux cyclic voltammograms (CVs) and ionic current CVs of various species and apply them to the real-time analyses of molecules/ions dynamics. For proof of concept, Ti3C2Tx MXene, a most studied two-dimensional metal carbide, is investigated as a supercapacitor electrode in a 1M H2SO4 electrolyte. The H2O and H+ flux CV plots are highly symmetrical, indicating reversible inserting/deserting species fluxes. The highest fluxes along with maximum hydration numbers are obtained at the peak current potential. This suggests the significant contribution of double-layer capacitance originates from the insertion of hydrated H+. The H+ CV with the ionic current induced by H+ flux overlaps the real CV, confirming that H+ is the only interactive ion for screening the electrode charge. Lastly, we also validate the proposed strategy using Ti3C2Tx MXene electrode in 1M KCl electrolyte and YP80 porous carbon electrode in 1 M LiCl electrolyte.

scholarly journals Specific carbon/iodide interactions in electrochemical capacitors monitored by EQCM technique

2021 ◽  
Vol 14 (4) ◽  
pp. 2381-2393
Author(s):  
Anetta Platek-Mielczarek ◽  
Elzbieta Frackowiak ◽  
Krzysztof Fic
Keyword(s):  
Alkali Metal ◽  
Aqueous Solutions ◽  
Quartz Crystal Microbalance ◽  
Porous Carbon ◽  
Quartz Crystal ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Ion Fluxes ◽  
Carbon Electrodes ◽  
Alkali Metal Cations ◽  
Porous Carbon Electrodes

This paper reports on the ion fluxes at the interfaces of various porous carbon electrodes/aqueous solutions of alkali metal cations (Na+, K+ and Rb+) and iodide anions, monitored by an electrochemical quartz crystal microbalance (EQCM).

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