PPy-MoS2 porous network flexible electrodes： Kinetic analysis of electrochemical behavior

doi:10.19799/j.cnki.2095-4239.2021.0677

Abstract

Abstract:

Combining the conducting polymer polypyrrole (PPy) with layered molybdenum disulfide (MoS₂) has proved to be an effective strategy to obtain a porous network flexible electrode. Various self-standing flexible electrodes with different structural parameters can be synthesized by controlling the preparation conditions. In this study, kinetics of the electrochemical behavior of PPy-MoS₂ electrodes were systematically investigated by analyzing electrochemical impedance spectroscopy and cyclic voltammetry (CV) curves. The Trasatti analysis method was adopted to quantify the charge stored at the inner and outer surfaces during energy storage. Results show that the volumetric capacity of the porous network flexible electrodes varies with thickness. The difference in volumetric capacity derives from the kinetic control on the energy storage reaction. The dominant control in that reaction changes from surface control to diffusion control as the thickness of the flexible electrode increases from 5 to 60 μm. When surface control and diffusion control coexist at similar levels, the porous network flexible electrode yields its maximum capacity (68 mA·h/cm³ at 5 mV/s). Therefore, to maximize storage efficiency, the interaction between active materials and electrolyte ions should be carefully optimized when the porous network film is applied to a flexible electrode.

Key words: porous network flexible electrode, kinetic analysis, surface control, diffusion control, storage efficiency

CLC Number:

TM 53

Yuyu TIAN, Jing LIU, Xuefeng SONG, Yu QIU, Liping ZHAO, Peng ZHANG, Yanting SUN, Lian GAO. PPy-MoS₂ porous network flexible electrodes： Kinetic analysis of electrochemical behavior[J]. Energy Storage Science and Technology, 2022, 11(4): 1141-1148.

Figures/Tables 6

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References 33

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PPy-MoS₂ porous network flexible electrodes： Kinetic analysis of electrochemical behavior

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