Photocatalytic reduction of carbon dioxide to methanol or carbon monoxide using cuprous oxide
Provided herein are methods of CO 2 reduction to methanol or CO using a Cu 2 O catalyst.
1. A method of converting CO 2 to methanol comprising irradiating CO 2 , water, and a catalyst consisting essentially of Cu 2 O nanoparticles having a (i i 0) facet to photocatalytically form methanol, wherein i is 1 to 12.
2. The method of claim 1 , wherein the irradiating comprises exposure to ultraviolet to visible light.
3. The method of claim 1 , wherein the irradiating comprises exposure to light having one or more wavelengths from 200 to 650 nm.
4. The method of claim 1 , wherein the water is present as a liquid.
5. The method of claim 1 , wherein the water is present as water vapor.
6. The method of claim 1 , wherein the (i i 0) facet is a (110) facet.
7. The method of claim 6 , wherein the Cu 2 O nanoparticles having a (110) facet are octahedral, truncated cubic, or a mixture thereof.
8. The method of claim 7 , wherein the irradiating comprises exposure to ultraviolet to visible light.
9. The method of claim 8 , wherein the irradiating comprises exposure to light having one or more wavelengths from 200 to 650 nm.
10. The method of claim 1 , where the method exhibits a quantum efficiency of at least 50%.
11. The method of claim 10 , wherein the quantum efficiency is at least 70%.
12. The method of claim 1 , wherein the CO 2 is continuously flowed through a suspension of the Cu 2 O nanoparticles in water during the irradiating.
13. The method of claim 1 , wherein the Cu 2 O nanoparticles having a (i i 0) facet are prepared by a method comprising admixing copper acetate, sodium hydroxide, glucose, and a surfactant and heating the admixture to 60° C. for 30-90 minutes to form the Cu 2 O nanoparticles having a (i i 0) facet.
14. The method of claim 13 , wherein the surfactant comprises sodium dodecyl sulfate.
15. A method of converting CO 2 to CO comprising
irradiating CO 2 , water, and a catalyst consisting essentially of MoS 2 adsorbed onto Cu 2 O nanoparticles to photocatalytically form CO,
wherein the Cu 2 O nanoparticles have a (i i 0) facet, and i is 1 to 12.
16. The method of claim 15 , wherein the irradiating comprises exposure to ultravisible to visible light.
17. The method of claim 15 , wherein the irradiating comprises exposure to light having one or more wavelengths from 200 to 650 nm.
18. The method of claim 15 , wherein the (i i 0) facet is a (110) facet.
19. The method of claim 15 , wherein the Cu 2 O nanoparticles having a (i i 0) facet are octahedral, truncated cubic, or a mixture thereof.
20. The method of claim 15 , wherein the Cu 2 O nanoparticles having a (i i 0) facet are prepared by a method comprising admixing copper acetate, sodium hydroxide, glucose, and a surfactant and heating the admixture to 60° C. for 30-90 minutes to form the Cu 2 O nanoparticles having a (i i 0) facet.