Enhanced photoreduction of CO2 into methanol by facet-dependent Cu2O/reduce graphene oxide

Shou Heng Liu, Jun Sheng Lu, Ying Chih Pu, Hsiao Chuan Fan

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The preparation of cuprous oxide (Cu2O) with different morphologies and oxidation states decorating with reduced graphene oxide (rGO) and their comparison in the photocatalytic reduction of CO2 are reported in the present work. The rhombic dodecahedra Cu2O/rGO exhibits the highest methanol yield (355.3 μmol g-1cat) which is ca. 4.1-80.8 times superior to cubic, octahedral Cu2O/rGO and CuO/rGO after 20 h of visible light illumination. The enhanced performance may be due to the unique rhombic dodecahedra structure with less band bending of conduction and valence bands which decrease the energy barrier for the transfer of photogenerated electrons to the surface. The incorporation of rGO should assist the transfer of photogenerated electrons from conduction band of Cu2O. The positively charged dodecahedra Cu2O/rGO may also increase the adsorption of carbonate anions from dissolution of CO2 gas. This work provides a facile solution-chemistry route to synthesize rGO incorporated crystal Cu2O with various facets as visible-light-active photocatalysts for CO2 utilization by using natural sunlight.

Original languageEnglish
Pages (from-to)171-178
Number of pages8
JournalJournal of CO2 Utilization
Volume33
DOIs
Publication statusPublished - 2019 Oct

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Process Chemistry and Technology

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