Structure, mechanical and electrochemical properties of thermally reduced graphene oxide-poly (Vinyl alcohol) foams

Wenxiu Wang, Hui Xu, Jian Chen, Yuanfang Shen, Imre Bertóti, Xinli Guo, Xiangru Shi, Zuhair Agab Elsiddig

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Graphene oxide foams with a wide range of poly (vinyl alco-hol) contents were synthesized by freeze casting, and then thermally reduced at 300ºC in argon atmosphere. Their thermal stability, microstructure, composition and chemical states of constituents, mechanical and electrical properties were investigated by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetry, compressive testing and electrochemical analysis. The results indicated that the PVA content highly influenced the crystal-linity and microstructure, resulting in different mechanical properties. After thermal reduction, not only graphene oxide was reduced to graphene, but also PVA was subjected to partial pyrolysis. With the increase of the PVA content, the intensity of the sp2 C-C bond decreased while the sp3 C-C bond increased. Although the mechanical properties decreased after thermal reduction, the composite foams still showed high cyclic structure stability up to 18 % compression strain. Meanwhile, the reduced foams exhibited high electrical conductivity. Applying as anodes in lithium ion battery, the initial discharge capacity for the foams can reach 1822 mA h g-1 and it remained more than 330 mA h g-1 after 50 cycles.

Original languageEnglish
Pages (from-to)8-20
Number of pages13
JournalPeriodica Polytechnica Chemical Engineering
Volume62
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

Keywords

  • Graphene
  • Mechanical properties
  • PVA
  • Thermal reduction

ASJC Scopus subject areas

  • Chemical Engineering(all)

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