Band structure engineering of a polyimide photocatalyst towards enhanced water splitting

Abstract

Polyimide (PI), a typical donor-acceptor polymeric semiconductor, exhibits promising photocatalytic applications owing to their distinct advantages of facile synthesis, easy functionalization and molecularly tunable optoelectronic properties. However, PI in its...

Band Structure Engineering of Polyimide Photocatalyst for Efficient and Selective Oxidation of Biomass‐Derived 5‐Hydroxymethylfurfural

“…[60,61] The peak of the heptazine structure appeared around 805 cm À 1 . [42,[60][61][62] In addition, the bands at 3537 and 3437 cm À 1 in the spectra of M 1 P 0.5 and M 1 P 1 corresponded to the stretching vibrations of N À H in terminal amino groups. [28,63] In the spectra of M 1 P 1 , M 1 P 2 , and M 1 P 3 , the characteristic peak located at 1853 cm À 1 belonging to the C=O in terminal anhydride groups.…”

“…As shown in Figure 2b, the FTIR spectra of M 1 P x showed distinctive bands at 700–1800 cm −1 and 3000–3600 cm −1 , compared with the g‐C 3 N 4 spectrum. The characteristic peaks located in 1775, 1720, and 722 cm −1 , were assigned to asymmetric stretching, symmetric stretching, and bending vibration peaks of the imide carbonyl groups in five‐membered imide rings, respectively [51,60] . The band of 1376 cm −1 was attributed to the characteristic stretching vibration of C−N−C in the imide rings [60,61] .…”

“…The characteristic peaks located in 1775, 1720, and 722 cm À 1 , were assigned to asymmetric stretching, symmetric stretching, and bending vibration peaks of the imide carbonyl groups in five-membered imide rings, respectively. [51,60] The band of 1376 cm À 1 was attributed to the characteristic stretching vibration of CÀ NÀ C in the imide rings. [60,61] The peak of the heptazine structure appeared around 805 cm À 1 .…”

“…[51,60] The band of 1376 cm À 1 was attributed to the characteristic stretching vibration of CÀ NÀ C in the imide rings. [60,61] The peak of the heptazine structure appeared around 805 cm À 1 . [42,[60][61][62] In addition, the bands at 3537 and 3437 cm À 1 in the spectra of M 1 P 0.5 and M 1 P 1 corresponded to the stretching vibrations of N À H in terminal amino groups.…”

“…[28,63] In the spectra of M 1 P 1 , M 1 P 2 , and M 1 P 3 , the characteristic peak located at 1853 cm À 1 belonging to the C=O in terminal anhydride groups. [60] The surface structure and chemical composition were further depicted by XPS analysis. Binding energies were calibrated by setting the lowest component of C 1s as 284.7 eV, which is the binding energy of carbon in an aromatic compound.…”