All-solid-state Z-scheme photocatalysts of g-C3N4/Pt/macroporous-(TiO2@carbon) for selective boosting visible-light-driven conversion of CO2 to CH4

Optimizing the Electronic Structure of ZnS via Cobalt Surface Doping for Promoted Photocatalytic Hydrogen Production

“…In addition, the Rct (charge transfer resistance) values for ZnS and CZS-4 are calculated to be 10.3 and 3.827 Ω, respectively, suggesting that Co doping can enhance the electrical conductivity and charge transfer. Furthermore, CZS-4 possesses higher photocurrent density compared with ZnS (Figure d), and higher current density indicates improved carrier separation efficiency. − Linear sweep voltammetry exhibits the higher photocurrent for CZS-4 relative to pristine ZnS at different voltages applied (Figure S12). In addition, water serves as an electron acceptor, so the contact degree between water and the photocatalyst can affect the photocatalytic H 2 evolution activity.…”

Graphitic Carbon Nitride-Based Z-Scheme Structure for Photocatalytic CO2 Reduction

“…14,15,52,54,56 GCN has an excellent activity in CO 2 molecule activation, while it shows inhibition for the formation of hydrocarbon products due to its low surface photoelectron density. 57 This causes GCN to have a highly selective formation rate of CO during PCR (96.7%), while its yield of CH 4 product is very low (1.4%). 57,58 Thus, for enhancement of the catalytic selectivity, and the photoelectrical and physicochemical proper-ties of GCN, different engineering strategies have been reported, such as elemental doping, 56,59 cocatalyst decoration, 60−62 vacancy defect engineering, 63 morphology control, 32 and heterojunction construction.…”

“…57 This causes GCN to have a highly selective formation rate of CO during PCR (96.7%), while its yield of CH 4 product is very low (1.4%). 57,58 Thus, for enhancement of the catalytic selectivity, and the photoelectrical and physicochemical proper-ties of GCN, different engineering strategies have been reported, such as elemental doping, 56,59 cocatalyst decoration, 60−62 vacancy defect engineering, 63 morphology control, 32 and heterojunction construction. 64 Especially, coupling GCN with other SC materials to construct a heterojunction hybrid offers a solution to accelerate the e − /h + pair separation and reconfigure the redox potential for improving the CO 2 photoreduction performance.…”

“…As an example, GCN was in situ grown on the inner wall of morphology-controlled Pt/TiO 2 @C. The photonic crystal structure of TiO 2 @C can improve visible light absorption. 57 The vectorial CT pathway of TiO 2 @C → Pt → GCN promoted the photogenerated electron enrichment on the N-sites at the Pt/GCN interface. The electrons could react with adsorbed CO 2 and H 2 O to produce CH 4 selectively.…”

“…Nevertheless, pristine GCN suffers from limited efficiency for PCR due to several defects: (i) low active specific surface area (SSA) for CO 2 adsorption; (ii) severe e – /h + recombination and low charge carrier separation efficiency; (iii) inadequate light utilization because of its relatively wide bandgap energy (∼2.7 eV); and (iv) kinetically sluggish CO 2 reduction due to the relatively lower CB position (−1.1 V vs RHE). ,,,, GCN has an excellent activity in CO 2 molecule activation, while it shows inhibition for the formation of hydrocarbon products due to its low surface photoelectron density . This causes GCN to have a highly selective formation rate of CO during PCR (96.7%), while its yield of CH 4 product is very low (1.4%). , Thus, for enhancement of the catalytic selectivity, and the photoelectrical and physicochemical properties of GCN, different engineering strategies have been reported, such as elemental doping, , cocatalyst decoration, − vacancy defect engineering, morphology control, and heterojunction construction . Especially, coupling GCN with other SC materials to construct a heterojunction hybrid offers a solution to accelerate the e – /h + pair separation and reconfigure the redox potential for improving the CO 2 photoreduction performance. , …”