Electrochemical deposition of highly porous reduced graphene oxide electrodes for Li-ion capacitors

Yi Zhan, Eldho Edison, William Manalastas, Ming Rui Joel Tan, Rohit Satish, Andrea Buffa, Srinivasan Madhavi, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Electrochemical deposition (ECD) is a promising and efficient technique for film assembly and electrode fabrication in energy storage and conversion devices. Herein, reduced graphene oxide (ErGO) with high porosity was driven by high-voltage ECD to form a binder-free capacitor electrode for lithium ion capacitors (LICs). The high voltage was used to drive the continuous and constant reduction of graphene oxide as well as for generation hydrogen, which was responsible for the porous structure. The latter not only prevented the severe stacking problem of reduced graphene oxide (rGO) but also facilitated the mass transfer of the electrolyte for the capacitive adsorption/desorption. One of the advantages of ECD is that it allows controlling very well the thickness and weight of the electrochemically deposited layer. Therefore, the effect of film thickness on the capacitive performance was also investigated. We found that increasing the film thickness did not linearly increase the areal capacitance, which was attributed to the resistive electrolyte diffusion through internal pores. Furthermore, a good capacitance as high as 168 F g−1 at 0.1 A g−1 was obtained by combining ErGO with V2O5 nanoparticles, benefiting from the integration of the high surface area of ErGO and the redox activity of V2O5.

Original languageAmerican English
Article number135861
JournalElectrochimica Acta
Volume337
DOIs
StatePublished - 20 Mar 2020

Bibliographical note

Publisher Copyright:
© 2020

Keywords

  • Electrochemical deposition
  • Graphene
  • Graphene oxide
  • Li-ion capacitor
  • Supercapacitors

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