Hexamolybdenum clusters supported on graphene oxide: Visible-light induced photocatalytic reduction of carbon dioxide into methanol

Alternative photocatalysts to TiO 2 for the photocatalytic reduction of CO 2

“…In this case, the excitation of Mo 6 units via the absorption of visible light, facilitated the transfer of electrons to the CB of GO where the reduction of CO 2 to methanol takes place. Besides, owing to the high mobility of charged species and its increased specific surface area, GO enhances the photocatalytic activity synergistically [149]. The photocatalytic efficiency of aqueous suspensions of carbon nanoparticles, bare or bearing metals (such as Au) on their surface, which act as electron acceptors, was also evaluated [150].…”

“…The photocatalytic activity of carbonaceous photocatalysts has been studied either in aqueous/organic suspensions or in gas-solid systems where the gaseous reaction mixture consisted of H 2 O and CO 2 . Aqueous suspensions of BiVO 4 /RGO (51.5 μmol ethanol/g * 10h), ZnO(10%wt)/RGO (263.1 μmol CΗ 3 OΗ /g * 3h) and solutions of Cs 2 Mo 6 Br i 8 Br a 6 /GO (1644 μmol CΗ 3 OΗ /g * 24h) in H 2 O/DMF exhibited the most enhanced activities among the GR based carbonaceous photocatalysts [139,145,[147][148][149][150]. Among the g-C 3 N 4 photocatalysts, the optimal photocatalytic activities were exhibited by aqueous suspensions of g-C 3 N 4 /r-P (295 μmol CΗ 4 /g * h) and S/g-C 3 N 4 (1.12 umol CΗ 3 OΗ /g * 3h) owing to its surface defects [155,157,[170][171][172][173].…”

Katalyse der Kohlenstoffdioxid‐Photoreduktion an Nanoschichten: Grundlagen und Herausforderungen

“…Dies wird bei der Deutung der Ergebnisse des Austauschs,d ie in Gegenwart von Graphen und Carbidnanoschichten gemessen wurden, hilfreich sein. Die Nanomaterialien lassen sich in zwei Gruppen einordnen:i )metallhaltige Photokatalysatoren wie Oxide, [11,39,48,53,54,70,[73][74][75][76][77][78][79][80][81] Chalkogenide, [49] Bismut-Oxyhalogenide, [82][83][84][85][86][87] Hydrotalcite [88] und Zeolithe; [89] ii)metallfreie Photokatalysatoren wie Graphen und seine Derivate (Graphenoxide (GO) und mit Heteroatomen dotiertes Graphen), [55,[90][91][92][93][94][95][96] g-C 3 N 4 [97][98][99][100][101][102] und kohlenstoffdotiertes h-BN. [55,56,72] Die Photoreduktionen von 13 CO 2 zu 13 CH 4 [55] und 13 CH 3 OH [54] wurden ebenfalls beschrieben.…”

Photocatalytic activity of erbium‐doped CeO2 enhanced by reduced graphene Oxide/CuO cocatalyst for the reduction of CO2 to methanol

“… utilized TiO 2 , CdS, and GaP semiconductors as photocatalysts for the reduction of CO 2 to formic acid, formaldehyde, methyl alcohol and methane. Photocatalytic CO 2 reduction , especially the photocatalytic reduction of CO 2 to methanol, has been extensively investigated since methanol is easily stored at ambient pressure and temperature and compatible with vehicles as a fuel .…”

“…CeO 2 is a semiconductor with oxygen vacancies related to the valence state of Ce 31 in CeO 2 [33], and oxygen vacancies can narrow the band gap of CeO 2 , according to which band gaps can be adjusted by dominating the concentration of oxygen vacancies or Ce 31 to improving the use of solar irradiation. Shieh et al [34] reported the positions of conduction and valence bands for CeO 2 as E c 5 21.02 V (versus NHE) and E v 5 1.53 V (versus NHE),CeO 2 can catalyze the reduction of CO 2 to fuel molecules under light irradiation.…”