Two-dimensional perovskites are an attractive alternative to 3D perovskites for solar cell application as they directly address a critical issue of stability of 3D perovskite solar cells, while achieving similarly high power conversion efficiencies.
enhanced activity both under λ > 420 nm and λ > 475 nm light irradiation and to long-term stability. The H 2 production rate of BP/g-C 3 N 4 (384.17 µmol g −1 h −1 ) is comparable to, and even surpasses that of the previously reported, precious metal-loaded photocatalyst under λ > 420 nm light. The efficient charge transfer between BP and g-C 3 N 4 (likely due to formed NP bonds) and broadened photon absorption (supported both experimentally and theoretically) contribute to the excellent photocatalytic performance. The possible mechanisms of H 2 evolution under various forms of light irradiation is unveiled. This work presents a novel, facile method to prepare 2D nanomaterials and provides a successful paradigm for the design of metal-free photocatalysts with improved chargecarrier dynamics for renewable energy conversion. solar fuel technology. For acquiring the above listed beneficial features, visible light-responsive graphitic carbon nitride (g-C 3 N 4 ), a 2D metal-free photocatalyst, has been extensively explored in photocatalysis. Though g-C 3 N 4 was discovered to be feasible for photocatalytic water splitting, obtaining a relatively high efficiency of H 2 production still largely relies on the loading of noble metal cocatalysts because of the high recombination rate of the charge carriers in g-C 3 N 4 . [2] Furthermore, the relatively wide bandgap (2.7 eV) confines its light response mainly into the ultraviolet (UV) range and only slightly into a narrow region of the visible light range (λ < 460 nm). [3] To solve these problems, numerous strategies have been developed, mainly including morphology tuning, doping with metal/nonmetal ions, and heterojunction creation. [4] However, quite limited progresses have been achieved thus far. Aiming to enhance the harvesting of solar light efficiently and economically, the development of novel g-C 3 N 4 -based metal-free photocatalysts with a broader photoresponse range is of great significance.Black phosphorus (BP), a layered material that consists of corrugated atomic planes with strong intralayer chemical bonding and weak interlayer van der Waals interactions, has attracted tremendous interest of material scientists. Since the
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