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CO2, water, and sunlight to hydrocarbon fuels: a sustained sunlight to fuel (Joule-to-Joule) photoconversion efficiency of 1%

Title
CO2, water, and sunlight to hydrocarbon fuels: a sustained sunlight to fuel (Joule-to-Joule) photoconversion efficiency of 1%
Authors
Sorcar, SauravHwang, YunjuLee, JaewoongKim, HwapyongGrimes, Keltin M.Grimes, Craig A.Jung, Jin-WooCho, Chang-HeeMajima, TetsuroHoffmann, Michael R.In, Su-Il
DGIST Authors
Cho, Chang-HeeIn, Su-Il
Issue Date
2019-09
Citation
Energy and Environmental Sciences, 12(9), 2685-2696
Type
Article
Article Type
Article
Keywords
PHOTOREDUCTIONPHOTOCATALYTIC REDUCTIONCARBON-DIOXIDETITANIA NANOPARTICLESCLIMATE-CHANGEZ-SCHEMETIO2CONVERSIONCH4H2O
ISSN
1754-5692
Abstract
If we wish to sustain our terrestrial ecosphere as we know it, then reducing the concentration of atmospheric CO2 is of critical importance. An ideal pathway for achieving this would be the use of sunlight to recycle CO2, in combination with water, into hydrocarbon fuels compatible with our current energy infrastructure. However, while the concept is intriguing such a technology has not been viable due to the vanishingly small CO2-to-fuel photoconversion efficiencies achieved. Herein we report a photocatalyst, reduced blue-titania sensitized with bimetallic Cu-Pt nanoparticles that generates a substantial amount of both methane and ethane by CO2 photoreduction under artificial sunlight (AM1.5): over a 6 h period 3.0 mmol g-1 methane and 0.15 mmol g-1 ethane are obtained (on an area normalized basis 0.244 mol m-2 methane and 0.012 mol m-2 ethane), while no H2 nor CO is detected. This activity (6 h) translates into a sustained Joule (sunlight) to Joule (fuel) photoconversion efficiency of 1%, with an apparent quantum efficiency of φ = 86%. The time-dependent photoconversion efficiency over 0.5 h intervals yields a maximum value of 3.3% (φ = 92%). Isotopic tracer experiments confirm the hydrocarbon products originate from CO2 and water. © 2019 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/10960
DOI
10.1039/c9ee00734b
Publisher
Royal Society of Chemistry
Related Researcher
  • Author Cho, Chang-Hee Future Semiconductor Nanophotonics Laboratory
  • Research Interests Semiconductor; Nanophotonics; Light-Matter Interaction
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceFuture Semiconductor Nanophotonics Laboratory1. Journal Articles
Department of Energy Science and EngineeringGreen and Renewable Energy for Endless Nature(GREEN) Lab1. Journal Articles


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