Porous nitrogen-rich g-C3N4 nanotubes for efficient photocatalytic CO2 reduction

An All‐Organic D‐A System for Visible‐Light‐Driven Overall Water Splitting

“…[47] In addition, the N Kedge XANES spectra (Figure 2c), for Bulk CN, TCN, and CTCN show four typical features at 399.7, 401.4, 402.5, and >405 eV, which can be assigned to π*(CNC), π*(N3C), π*(N3C bridging), and σ*(CNC/CN). [45] The enhancement of π*(CNC) feature for CTCN suggests a strengthen interfacial interaction between carbon rings units and the basal plane of gC 3 N 4 , which is consistent with the result of C Kedge XANES spectra. This newly formed carbon rings units can be further verified by the solidstate 13 C NMR spectra (Figure 2d).…”

“…In the C Kedge XANES spectra (Figure 2b), both samples display a typical struc ture of gC 3 N 4 , which can be indexed to σ*(CNC/CN), π*(CNC), and π*(CC/CC). [31,45] Interestingly, CTCN exhibits higher peak intensity of π*(CC/CC) than that of Bulk CN and TCN, which may be derived from the introduction of carbon rings units. In consideration of the higher electron withdrawing property of carbon rings than gC 3 N 4 , the electron migration from the basal plane of gC 3 N 4 to carbon rings units could be expected in CTCN.…”

Structural engineering of 3D hierarchical Cd0.8Zn0.2S for selective photocatalytic CO2 reduction

“…Before the conversion of CO2 to CO and CH4, the adsorbed CO2 was activated (CO2)ad (step 1 in Fig. 4(c)) [22,34]. In the CO2-TPD measurements (Fig.…”

“…For instance, Liu et al [21] prepared ultrathin 2D covalent organic framework nanosheets with excellent CO production due to a large surface area and enhanced contact between the substrate and the molecule. Mo et al [22] reported porous nitrogen-rich g-C3N4 with Lewis basicity for the efficient photocatalytic reduction of CO2. Furthermore, Liu et al [23] synthesized 3D TiO2 hollow microspheres decorated with abundant surface defects for synergetic tailoring on the visible-light-driven catalytic conversion of CO2.…”

Graphitic carbon nitride nanotubes: a new material for emerging applications

“…122 The rate of the photocatalytic CO evolution over such GCNTs was found to be 17 and 15 times higher than over bulk GCN and titania P25. 122 The introduction of nitrogen vacancies in GCNTs by postsynthesis thermal treatment was found to result in a considerable increase in their photocatalytic activity in the CO 2 reduction to CO by water vapors without additional electron donors or co-catalysts. 105 Due to the complex effect of N vacancies on the photophysical properties of GCNTs, both in extending the light sensitivity range and in providing the traps states for the photogenerated electrons, the highest photocatalytic activity is observed for an intermediate population of vacancies, at which the CO 2 conversion rate achieves almost 44 mmol g À1 h À1 , surpassing by an order of magnitude the photoactivity of bulk GCN with no N vacancies.…”