Decoration of Hydrophobic Graphene Nanosheets with Iron Phosphate Based Materials in an Aqueous Solution

Hyun Kyung Kim, Jong Pil Jegal, Myeong Seong Kim, Kwang Chul Roh, Kwang Bum Kim

Research output: Contribution to journalArticle

Abstract

The surfaces of hydrophobic graphene nanosheets (GNs) are successfully decorated, aided by urea, with FePO4-based materials in an aqueous solution. The hydrophobic GNs can easily disperse in the aqueous solution without functionalization in the presence of urea, leading to the formation of a GNs-based nanocomposite with minimal sacrifice of the electrical conductivity of the GNs. Compared with reduced graphene oxide (rGO) decorated with FePO4H2O (FePO4H2O/rGO), synthesized using a graphene oxide (GO) substrate, the resulting FePO4H2O/GNs nanocomposite exhibit superior rate performance, because the GNs have a higher C/O ratio than the rGO. In addition, LiFePO4/GNs with high coulombic efficiency and energy efficiency, prepared using FePO4H2O/GNs, deliver a discharge capacity of 62mAhg-1 at 120C rate. Furthermore, a full cell consisting of LiFePO4/GNs and Li4Ti5O12/graphene exhibits excellent rate performance up to 60C rate.

Original languageEnglish
Pages (from-to)2048-2054
Number of pages7
JournalChemElectroChem
Volume2
Issue number12
DOIs
Publication statusPublished - 2015 Dec 1

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Electrochemistry

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