Effect of linkages on photocatalytic H2 evolution over covalent organic frameworks

Covalent organic frameworks with interlayer fixed Pt atoms for efficient electrocatalytic hydrogen evolution

“…S11, ESI †). 48 Similar results for TTB-COF, TTB-COP, Pt@TTB-COF, and Pt@TTB-COP indicated that the loading of Pt atoms does not change the chemical structure of the carbon frameworks. In addition, the two peaks at 398.6 eV and 399.8 eV in the N 1s XPS pattern corresponded to the triazine N and CQN structures, respectively, according to the bonding structure and monomer structure of TTB-COF.…”

Electron-rich Pt anchored on covalent triazine frameworks for the selective hydrogenation of halogenated nitrobenzenes

“…The peaks at 4.91°, 5.97°, 7.89°, and 24.5°corresponded to the (110), ( 200), (210), and (001) planes. 43 In the PXRD pattern of TAPB-COF, the diffraction peak with the highest intensity was observed at 3.35°, corresponding to the (110) plane, and other peaks at 4.90°, 5.79°, 7.37°, 9.50°, and 24.5°w ere assigned to the (200), ( 220), ( 310), (400), and (001) planes. 34 These patterns confirmed the crystalline structure of TAPT-COF and TAPB-COF with eclipsed AA on two-dimensional stacking models.…”

“…In addition, the overlapping peaks from 126.2 to 141.6 ppm were assigned to phenyl carbons for TAPB-COF in the 13 C NMR spectrum. 34,43 The FT-IR spectra of TAPT-COF in Fig. 1b show the typical asymmetric and symmetric vibrations of CvO at 1787 and 1724 cm −1 , and the absorption band of C-N-C of the imide ring was observed at 1364 cm −1 .…”

Recent advances on covalent organic frameworks (COFs) as photocatalysts: different strategies for enhancing hydrogen generation

“…By choosing building blocks with similar skeleton structures as knots, but with different linkages to investigate HER property is necessary (Table 2). [95][96][97] To this end, Yu and co-authors adopted triphenylbenzene knots and phenyl linkers to explore the effect of three structurally similar COFs with distinct linkages on the photocatalytic hydrogen precipitation performance. 95 The experiments revealed that the HER activity could be tuned with the rate in the order of COF-olefin (2.33 mmol g À1 h À1 ) c COFimide (o40 mmol g À1 h À1 ) 4 COF-imine (o40 mmol g À1 h À1 ).…”