Dense yet highly ion permeable graphene electrodes obtained by capillary-drying of a holey graphene oxide assembly

Xiangrong Chen, Junwei Han, Xiaohui Lv, Wei Lv, Zhengze Pan, Chong Luo, Siwei Zhang, Qiaowei Lin, Feiyu Kang, Quan Hong Yang

Research output: Contribution to journalArticlepeer-review

Abstract

The density and ion channel abundancy of an electrode material must be elaborately balanced to achieve a high volumetric energy density for any energy storage devices. As a typical example, graphene shows great potential in different energy storage devices but its low density and ion diffusion barrier effect limit its practical uses. In the present work, H2O2 etching was introduced into the hydrothermal assembly of graphene oxide (GO) to decrease the lateral size of GO and create in-plane holes, and after a capillary drying process, a high-density holey graphene monolith (HHGM) with numerous and interconnected ion transporting channels was obtained. The smaller sheet size leads to a more densified assembly while in-plane holes are beneficial to ion transportation in the HHGM, which well balance the high density and fast ion diffusion in the electrode. As a result, the HHGM shows an impressive rate performance, coupled with a high volumetric capacitance.

Original languageEnglish
Pages (from-to)12691-12697
Number of pages7
JournalJournal of Materials Chemistry A
Volume7
Issue number20
DOIs
Publication statusPublished - 2019
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Dense yet highly ion permeable graphene electrodes obtained by capillary-drying of a holey graphene oxide assembly'. Together they form a unique fingerprint.

Cite this