Iodine Modified Carbon Nitride Semiconductors as Visible Light Photocatalysts for Hydrogen Evolution

Abstract

An optimized and general synthetic strategy based on in-situ iodine modifying of polymeric graphitic carbon nitride is discussed. The as-prepared iodine functionalized g-CN shows enhanced electronic and optical properties, as well as increased photocatalytic activities in an assay of hydrogen evolution.

Metal–Organic Framework‐Derived ZnO/ZnS Heteronanostructures for Efficient Visible‐Light‐Driven Photocatalytic Hydrogen Production

“…The PL quenching behavior suggests the effective suppression of the electron–hole recombination,47 while the lower recombination rate can facilitate the heterogeneous photocatalysis. In accordance with the PL spectra, ZnOS‐30 exhibits the smallest Nyquist plot diameter in the electrochemical impedance spectra (EIS, Figure 4c), indicating its low charge‐transfer resistance 48, 49, 50. Moreover, the photocurrent density of ZnOS‐30 is the highest in the ZnOS‐n (Figure 4d), illustrating its high efficient separation of photoexcited charge carriers,51 which is attributed to its abundant coupling interface between ZnO and ZnS nanoparticles resulting from the almost equal amounts of ZnO and ZnS in ZnOS‐30.…”

Holey Graphitic Carbon Nitride Nanosheets with Carbon Vacancies for Highly Improved Photocatalytic Hydrogen Production

“…As compared in Figure 4 D, both BGCN and HGCN exhibit one single Lorentzian line with a g value of 2.0036 in a magnetic fi eld from 3400 to 3600 G, and this is induced by a lone electron pair on the carbon atoms of the heptazine rings within p-bonded nanosized clusters. [ 24,27 ] However, compared to the parent BGCN, the signifi cantly stronger EPR spin intensity of HGCN reveals the much higher concentration of unpaired electrons, which is very useful for the photogeneration of active radical pairs for catalytic reaction. [ 24 ] Such optical properties of HGCN are very benefi cial for the photocatalytic process.…”

“…[ 24,27 ] However, compared to the parent BGCN, the signifi cantly stronger EPR spin intensity of HGCN reveals the much higher concentration of unpaired electrons, which is very useful for the photogeneration of active radical pairs for catalytic reaction. [ 24 ] Such optical properties of HGCN are very benefi cial for the photocatalytic process. In order to make sure that the as-prepared HGCN are suitable for photocatalytic hydrogen evolution under visible light, we studied their electronic band structure by examining of Mott-Schottky plots which refers to the apparent capacitance as a function indifferent frequency ranges compared to BGCN.…”

A Conjugated Microporous Polymer for Palladium‐Free, Visible Light‐Promoted Photocatalytic Stille‐Type Coupling Reactions

“…Among them, metal‐free photocatalytic systems8, 9 offer a more sustainable and environmentally friendly alternative compared to the traditional transition metal complexes such as Ru(bpy) 3 Cl 2 and fac ‐Ir(ppy) 3 ,9, 10 or recently reported common metal‐based photocatalysts such as copper 11. Among the recently developed nonmetal photocatalysts, conjugated small molecule4, 12, 13 and especially macromolecular8, 14 systems have been employed as efficient photocatalyts for visible light‐promoted photocatalytic reactions. As a recently emerging macromolecular photocatalytic system, conjugated microporous polymers, which combine semiconductor property and high interfacial properties, have demonstrated their versatile utilization for visible light‐promoted photoredox reactions.…”