Direct Conversion of Greenhouse Gas CO2 into Graphene via Molten Salts Electrolysis

Liwen Hu, Yang Song, Shuqiang Jiao, Yingjun Liu, Jianbang Ge, Handong Jiao, Jun Zhu, Junxiang Wang, Hongmin Zhu, Derek J. Fray

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Producing graphene through the electrochemical reduction of CO2 remains a great challenge, which requires precise control of the reaction kinetics, such as diffusivities of multiple ions, solubility of various gases, and the nucleation/growth of carbon on a surface. Here, graphene was successfully created from the greenhouse gas CO2 using molten salts. The results showed that CO2 could be effectively fixed by oxygen ions in CaCl2-NaCl-CaO melts to form carbonate ions, and subsequently electrochemically split into graphene on a stainless steel cathode; O2 gas was produced at the RuO2-TiO2 inert anode. The formation of graphene in this manner can be ascribed to the catalysis of active Fe, Ni, and Cu atoms at the surface of the cathode and the microexplosion effect through evolution of CO in between graphite layers. This finding may lead to a new generation of proceedures for the synthesis of high value-added products from CO2, which may also contribute to the establishment of a low-carbon and sustainable world. Gr-aph-een Planet: Graphene is successfully produced through the electrochemical reduction of CO2 via molten salts electrolysis. The process requires good control of kinetics, such as diffusivities of multiple ions, solubility of various gases, and the nucleation/growth of carbon on a surface, and may lead to a new generation of procedures for the synthesis of high value-added products from CO2, contributing to the establishment of a low-carbon and sustainable world.

Original languageEnglish
Pages (from-to)588-594
Number of pages7
JournalChemSusChem
Volume9
Issue number6
DOIs
Publication statusPublished - 2016 Mar 21
Externally publishedYes

Keywords

  • carbon dioxide
  • electrochemistry
  • graphene
  • molten salt
  • reduction

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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  • Cite this

    Hu, L., Song, Y., Jiao, S., Liu, Y., Ge, J., Jiao, H., Zhu, J., Wang, J., Zhu, H., & Fray, D. J. (2016). Direct Conversion of Greenhouse Gas CO2 into Graphene via Molten Salts Electrolysis. ChemSusChem, 9(6), 588-594. https://doi.org/10.1002/cssc.201501591