Open AccessExceptional Photocatalytic Activities of rGO Modified (B,N) Co‐Doped WO 3 , Coupled with CdSe QDs for One Photon Z‐Scheme System: A Joint Experimental and DFT Study
Author(s) -
Raziq Fazal,
Aligayev Amil,
Shen Huahai,
Ali Sharafat,
Shah Rahim,
Ali Sajjad,
Bakhtiar Syedul H.,
Ali Asad,
Zarshad Naghat,
Zada Amir,
Xia Xiang,
Zu Xiaotao,
Khan Muslim,
Wu Xiaoqiang,
Kong Qingquan,
Liu Chunming,
Qiao Liang
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202102530
Subject(s) - materials science , quantum dot , photon , photocatalysis , doping , density functional theory , spectroscopy , optoelectronics , visible spectrum , nanotechnology , physics , chemistry , optics , computational chemistry , catalysis , biochemistry , quantum mechanics
Artificial Z‐scheme, a tandem structure with two‐step excitation process, has gained significant attention in energy production and environmental remediation. By effectively connecting and matching the band‐gaps of two different photosystems, it is significant to utilize more photons for excellent photoactivity. Herein, a novel one‐photon (same energy‐two‐photon) Z‐scheme system is constructed between rGO modified boron‐nitrogen co‐doped‐WO 3 , and coupled CdSe quantum dots‐(QDs). The coctalyst‐0.5%Rh x Cr 2 O 3 (0.5RCr) modified amount‐optimized sample 6%CdSe/1%rGO3%BN‐WO 3 revealed an unprecedented visible‐light driven overall‐water‐splitting to produce ≈51 µmol h −1 g −1 H 2 and 25.5 µmol h −1 g −1 O 2 , and it remained unchanged for 5 runs in 30 h. This superior performance is ascribed to the one‐photon Z‐scheme, which simultaneously stimulates a two photocatalysts system, and enhanced charge separation as revealed by various spectroscopy techniques. The density‐functional theory is further utilized to understand the origin of this performance enhancement. This work provides a feasible strategy for constructing an efficient one‐photon Z‐scheme for practical applications.