Edge- and bridge-engineering-mediated exciton dissociation and charge separation in carbon nitride to boost photocatalytic H₂ evolution integrated with selective amine oxidation

Abstract

Carbon nitride holds a great interesting in the photocatalytic hydrogen evolution integrated with selective amines oxidation (HAR). However, C3N4 often suffers from the restriction strong intrinsic Coulomb interactions, random charge...

Controlling Electronic Properties of Carbon Nitride Nanotubes by Carbon Doping for Photocatalytic H2 Production

“…XPS is carried out to study the chemical state of CN and C-doped carbon nitride, and the spectra are displayed in Figure C,D. As for C 1s, three peaks located at 284.46, 285.79, and 287.95 eV are indexed to graphite carbon, C–NH x ( x = 1, 2), and N–CN, respectively . Notably, C 1s spectra of CCN-10 also display three peaks at about 284.46, 285.83, and 287.99 eV but have slight shifts than pure CN (Figure S1B).…”

“…As for C 1s, three peaks located at 284.46, 285.79, and 287.95 eV are indexed to graphite carbon, C−NHx (x = 1, 2), and N−C�N, respectively. 45 Notably, C 1s spectra of CCN-10 also display three peaks at about 284.46, 285.83, and 287.99 eV but have slight shifts than pure CN (Figure S1B). Moreover, compared with pure CN, the N−C�N peak area ratio of CCN-10 reduces from 87.1 to 84.9% (Table S1).…”

Polarization Reorientation of Carbon Nitride Induced by a Local Bridge Donor for Boosting Photocatalytic H2 Evolution Integrated with Selective Amine Oxidation

“…The results indicate that the band location of the prepared samples is advantageous for hydrogen evolution (+1.23 vs NHE) and benzylamine oxidation (+0.76 vs NHE). 8,54 Above all, the intercalation of P�N into carbon nitride as a bridge unit not only enhances light absorption but also promotes the transfer of charge carriers and improves the photocatalytic performance.…”

“…To achieve efficient H 2 production, most researchers focused on adding sacrificial additives (e.g., triethanolamine, triethylamine, and methanol) for hole consumption. 7,8 Recently, photocatalytic water splitting for H 2 production and synergistic selective oxidation of organics has aroused much attention. Imines, which are biologically active nitrogen-containing chemical molecules, have been widely employed in medicine and biology.…”

“…With the rapid consumption of fossil energy and the deteriorating environment, photocatalytic water splitting for hydrogen (H 2 ) production is regarded as an ideal way to tackle energy and environmental crises. − In photocatalytic water splitting, the H 2 production efficiency is often impeded by the sluggish kinetics of oxygen production. To achieve efficient H 2 production, most researchers focused on adding sacrificial additives (e.g., triethanolamine, triethylamine, and methanol) for hole consumption. , Recently, photocatalytic water splitting for H 2 production and synergistic selective oxidation of organics has aroused much attention. Imines, which are biologically active nitrogen-containing chemical molecules, have been widely employed in medicine and biology.…”