Tunable syngas production from photocatalytic CO₂ reduction with mitigated charge recombination driven by spatially separated cocatalysts

Abstract

This paper describes the production of syngas from photocatalytic CO2 reduction with a tunable CO/H2 ratio via adjusting the properties of CuPt alloy and the distribution of cocatalysts on TiO2 hollow spheres.

Polydopamine and Barbituric Acid Co‐Modified Carbon Nitride Nanospheres for Highly Active and Selective Photocatalytic CO2 Reduction

“…It can be observed that the PL peaks of BA 20 ‐CNS and CNS‐PDA 15 samples diminished in intensity compared with pristine CNS. And particularly, the BA 20 ‐CNS‐PDA 15 displayed the weakest PL emission, indicating that the recombination of photoinduced electron‐hole pairs has been suppressed effectively due to modification by BA and PDA , . In addition, the PL peak of BA 20 ‐CNS‐PDA 15 and BA 20 ‐CNS shifted towards longer wavelength, indicating the visible light absorption range is expanded due to the copolymerization with BA .…”

Three‐Phase Photocatalysis for the Enhanced Selectivity and Activity of CO2 Reduction on a Hydrophobic Surface

“…The mechanism behind this enhancement can be attributed to the increased concentration of CO 2 adsorbed onto the hydrophobic surface, and can also be proved by the in situ infrared (IR) spectrum (Figure 4 c). [2, 38] Under irradiation, the photogenerated electrons are collected by Pt particles to create a negatively charged active sites [18a] . The activated CO 2 molecules are adsorbed on it in the form of carboxy group (*COOH; Figure 4 b), [2, 38] which can be detected by in situ IR (details see section 8 of methods).…”

Formation of NiCo Alloy Nanoparticles on Co Doped Al2O3 Leads to High Fuel Production Rate, Large Light‐to‐Fuel Efficiency, and Excellent Durability for Photothermocatalytic CO2 Reduction

“…[ 1,2 ] Due to sunlight merely available in the daytime, it is urgently needed to develop efficient approach for solar energy storage. The reported approaches include photocatalytic water splitting [ 3–12 ] and CO 2 reduction [ 13–32 ] to synthesize solar fuels, and so on. Among the approaches, photocatalytic CO 2 reduction is very appealing because it could afford an approach of simultaneously addressing the two issues of global warming and solar energy storage.…”

“…[ 3–5,13 ] Very extensive works have been devoted to take up the challenges during the past decades. [ 13–32 ] In the view of photocatalytic principle, η for photocatalytic solar fuel production is inevitably far less than η pv as it depends on not only separation efficiency of charge carriers like photovoltaics, but also transfer efficiency of charge carriers, and reaction efficiency of charge carriers with reactants (e.g., H 2 O, CO 2 , etc.). Moreover, unlike photovoltaics, due to band gap matching required by photocatalytic solar fuel production, it is extremely difficult to design a semiconductor photocatalyst with narrow band gap that could utilize infrared energy, [ 3–15 ] which account for about 50% of solar energy.…”