Direct Z‐Scheme Hetero‐phase Junction of Black/Red Phosphorus for Photocatalytic Water Splitting

Abstract

Black phosphorus (BP) has recently drawn attention in photocatalysis for its optical properties. However, limited by the rapid recombination of photogenerated carriers, the use of BP for photocatalytic water splitting still remains a huge challenge. Herein, we prepare a black/red phosphorus (BP/RP) hetero‐phase junction photocatalyst by a wet‐chemistry method to promote the interfacial charge separation and thus achieve Z‐scheme photocatalytic water splitting without using sacrificial agents. The Z‐scheme mechanism was confirmed by time‐resolved transient absorption spectroscopy. This work provides a novel insight into the interface design of hetero‐phase junction with atomic precision.

A [001]‐Oriented Hittorf's Phosphorus Nanorods/Polymeric Carbon Nitride Heterostructure for Boosting Wide‐Spectrum‐Responsive Photocatalytic Hydrogen Evolution from Pure Water

“…Interestingly, no O 2 evolution by four-electron water oxidation was observed (Supporting Information, Figure S13). Instead, hydrogen peroxide (H 2 O 2 )w ere produced by photoholes via at wo-electron process of water oxidation, [15,22] with the H 2 :H 2 O 2 ratio (1:0.9) close to 1:1( Supporting Information, Figures S14, S15). Moreover,P CN@HP(0.4) still retained 90.4 %o fi ts original photocatalytic HER rate after a1 6h continuous light irradiation, revealing its reasonable photocatalytic durability (Supporting Information, Figure S16).…”

“…[7,9,11] Until very recently,the BP/RP hetero phase junction and BP/RP quantum dots were successfully developed to achieve photocatalytic water splitting without using sacrificial agents. [15] In this work, through af acile CVD strategy, [11] [001]oriented hexagonal-shaped Hittorfsp hosphorus (HP) nanorods with exposed {110} facets were vertically grown on polymeric carbon nitride (PCN) from am ixture of PCN and amorphous RP precursors.B yt uning the weight ratios of RP:PCN in precursor mixtures,t he optimized PCN@HP heterostructure exhibited the highest photocatalytic activity for pure water splitting, with hydrogen evolution reaction (HER) rates reaching 33.2 and 17.5 mmol h À1 under simulated solar light and visible light irradiation, respectively.I tw as seen that the strong electronic coupling between PCN and HP gave rise to the enhanced visible light absorption and the greatly accelerated photoinduced electron-hole separation and transfer along the [001] direction of HP nanorods, contributing to the improved photocatalytic activity for pure water splitting.…”

Strong‐Base‐Assisted Synthesis of a Crystalline Covalent Triazine Framework with High Hydrophilicity via Benzylamine Monomer for Photocatalytic Water Splitting

“…After excitation, all of transient spectra of CTF‐HUST‐A1‐K 2 CO 3 , CTF‐HUST‐A1‐KOH, and CTF‐HUST‐A1‐EtOK and CTF‐HUST‐A1‐ t BuOK exhibited broad absorption bands in the visible regions (Supporting Information, Figure S43).In general, the absorption peaks of the surface‐trapped holes and electrons in the transient absorption spectra (TAS) may be found in the visible light region (430–750 nm) . According to the literature reports, the short lifetime ( τ 1 ) and long lifetime ( τ 2 ) components may be assigned to electrons trapped at shallow and deep sites of materials before the recombination between the holes in the VBM and the electrons in the CBM, respectively . The lifetime of the photogenerated charges are calculated and compared with each other (Figure ).…”

Defect Engineering of Photocatalysts for Solar Energy Conversion

“…Generally, the defects have been classified according to the atomic structures or the location of the defects in the semiconductor photocatalysts. In principle, as shown in Figure , all structural irregularities in the photocatalysts can be rationally divided into following four main divisions according to the dimensions: point defects (vacancy), line defects (edge dislocation and screw dislocation), planar defects (twin and grain boundary), and volume defects (void and lattice disorder) …”