All-solid-state flexible asymmetric micro supercapacitors based on cobalt hydroxide and reduced graphene oxide electrodes

Su Chan Lee, U. M. Patil, Sun Jun Kim, Seokhoon Ahn, Seok Won Kang, Seong Chan Jun

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

In-plane micro supercapacitors (micro-SC) have attracted interest due to their high areal and volumetric capacitance that is dependent upon their electrode structure. This study proposes simply-fabricated micro-SCs based on cobalt hydroxide and electrochemically-reduced graphene oxide (erGO). The Au electron collector was prepared via photolithography, and Co(OH)2 and erGO were deposited on the Au surface via electrodeposition. Using facile two-step fabrication method and cost-effective materials, the prepared micro-SCs exhibit good electrochemical performance in PVA-KOH-KI solid electrolyte. The in-plane interdigitated electrode maximizes the areal capacitance by increasing the facing area between the anode and cathode. The micro-SC presents good power density (100.38 μW cm-2) and a wide potential window due to the electric double-layer properties of erGO and pseudocapacitive performance of Co(OH)2. These fabricated micro-SCs are flexible and can be used in various wearable and small-scale energy storage devices.

Original languageEnglish
Pages (from-to)43844-43854
Number of pages11
JournalRSC Advances
Volume6
Issue number50
DOIs
Publication statusPublished - 2016

Bibliographical note

Funding Information:
This work was partially supported by the Priority Research Centers Program (2009-0093823), the Basic Science Research Program (grant number 2013063062), the Korean Government (MSIP) (No. 2015R1A5A1037668) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST), and the Korea Research Fellowship Program funded by the Ministry of Science, ICT and Future Planning through the National Research Foundation of Korea (2015-11-1063).

Publisher Copyright:
© 2016 The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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