Journal
JOURNAL OF CO2 UTILIZATION
Volume 33, Issue -, Pages 171-178Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2019.05.020
Keywords
Cuprous oxide; Crystal facets; Reduced graphene oxide; Renewable energy; CCSU
Funding
- Ministry of Science and Technology of Taiwan [MOST104-2628-E-006-018-MY3]
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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 mu mol g(-1)cat) 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.
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