Solar-driven CO2 conversion over Co2+ doped 0D/2D TiO2/g-C3N4 heterostructure: Insights into the role of Co2+ and cocatalyst

Morphology and element doping effects: phosphorus-doped hollow polygonal g-C3N4 rods for visible light-driven CO2 reduction

“…Based on our results and previous reports, 45–47,53–55 a possible mechanism of P-HCNR promoted photocatalytic CO 2 reduction is postulated (see Fig. 1).…”

“…According to the literature studies, adding a metal atom/ion or complex to the semiconductor system is a useful strategy to improve the photoreduction efficiency and selectivity towards the reductive product by binding the reactant specifically and facilitating the charge transfer between the semiconductor and metal center, 48–50 among which Co is attractive with its high efficiency and selectivity to CO. 51–56 In particular, [Co(bpy) 3 ]Cl 2 is frequently used in photocatalytic CO 2 reduction due to its high selectivity to CO and excellent performance in facilitating the charge transfer between the semiconductor and metal complex. 53–55 In this context, we envisaged that combining the phosphorus-doped g-C 3 N 4 semiconductor with an earth abundant metal-based complex, i.e. [Co(bpy) 3 ]Cl 2 , will enhance the efficiency and CO selectivity in this study.…”

Facile Construction of a Hollow In2S3/Polymeric Carbon Nitride Heterojunction for Efficient Visible-Light-Driven CO2 Reduction

“…Although electrons and holes are produced when the photocatalyst is under irradiation, most electrons cannot participate in the CO 2 reduction reaction because of the rapid recombination rate of the carriers. [Co­(bpy) 3 ] 2+ functions as an electron mediator, which can capture the photoinduced electrons and transfer them to CO 2 . ,− No obvious CO is generated if we replace CO 2 with Ar (column 6), demonstrating that CO 2 is the only carbon source, not MeCN, TEOA, or bpy in the system. Finally, to further understand the reasons for the excellent photoreduction performance of IS/CN-5, the activities of IS + CN (physical mixture of IS and CN) and IS-NP/CN were also evaluated.…”

“…Because of the formation of a heterojunction, the photogenerated electrons in the CB of IS transfer to the CB of CN, while the photogenerated holes in the VB of CN move to the VB of IS. Finally, the [Co­(bpy) 3 ] 2+ cocatalyst captures the photogenerated electrons to form [Co­(bpy) 3 ] + , which can easily transfer the electrons to CO 2 and complete the CO 2 -to-CO reaction, accompanied by the recovery of [Co­(bpy) 3 ] 2+ . ,, In addition, the photogenerated holes are consumed by TEOA.…”

Confined Catalysts Application in Environmental Catalysis: Current Research Progress and Future Prospects

“…The yields of CO, methanol, acetaldehyde, and ethanol were 180.1, 997.2, 531.5, and 1505.7 μmol/g, respectively. Shi et al [127] . prepared Co 2+ ‐doped 0D/2D TiO 2 quantum dots confined in a graphitic carbon nitride (CoTiCN) heterostructure.…”