544333 Photocatalytic Upgrade of CO2 to Synthetic Natural Gas

Wednesday, June 5, 2019: 3:03 PM
Republic ABC (Grand Hyatt San Antonio)
Steven Bardey1,2, Audrey Bonduelle-Skrzypczak1, Antoine Fécant1, Valérie Caps2 and Valérie Keller2, (1)IFPEN, Solaize, France, (2)ICPEES (CNRS UMR 7515/ University of Strasbourg), Strasbourg, France

The direct conversion of solar energy into valuable chemical fuels is a great challenge for clean energy production. In this context, the photo-reduction of CO2 into methane has received increasing attention over the last few years. This way of producing synthetic natural gas would indeed represent a step forward towards sustainability, due to the nature of the carbon source, a major by-product of energy consumption, and its increasing availability. However, the conversion rate of photonic energy into chemical energy by semi-conductor-based photocatalysis is still too low, as current energy carriers make use of only a fraction of the solar spectrum. Hence, the development of photocatalysts with improved and broadened light absorption is needed to efficiently use sunlight as primary energy source. Amongst the possible materials, multi-component systems containing metal nanoparticles (M NPs) in interaction with a semi-conductor (SC) appear promising. In addition to their beneficial role as co-catalysts and electron traps,1 M NPs may indeed improve the SC photocatalytic performances by plasmon-derived physical phenomena, which requires control over the M-SC interface at the nanoscale2. We have recently designed an optimized heterojunction between titania and carbon nitride with improved activity for photocatalytic hydrogen production from water in the presence of Au NPs.3 Here we show the impact of the nanostructuration of both gold-titania and platinum-titania interfaces on their performances in the solar photocatalytic reduction of CO2. Results will be discussed in terms of electronic metal-support interactions (eMSI)4 and Au NPs density, based on TEM, XRD/BET and UV-Vis characterization in particular. Finally, we will present the rational design of highly efficient composites, i.e. materials combining unprecedented quantum yields and selectivities to methane (close to 100%), based on these studies.

[1] Ran, J.; et al. Adv. Mater., 2018, 30, 1704649.

[2] Shiraishi, Y.; et al. Nanoscale, 2017, 9, 834.

[3] Marchal, C.; et al. Adv. En. Mater., 2018, 8, 1702142.

[4] Gao, W.; et al. Nano Lett., 2015, 15, 2548.

[5] Marchal, C.; et al. J. Catal., 2017, 352, 22.

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