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Oxygen Vacancies Induced Plasmonic Effect for Realizing Broad‐Spectrum‐Driven Photocatalytic H 2 Evolution over an S‐Scheme CdS/W 18 O 49 Heterojunction
Author(s) -
Liu Qinqin,
He Xudong,
Tao Junnan,
Tang Hua,
Liu ZhaoQing
Publication year - 2021
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.202000536
Subject(s) - photocatalysis , heterojunction , visible spectrum , materials science , plasmon , surface plasmon resonance , photochemistry , oxygen , oxygen evolution , optoelectronics , irradiation , nanotechnology , chemistry , nanoparticle , electrochemistry , physics , electrode , catalysis , biochemistry , organic chemistry , nuclear physics
Abstract Broad‐spectrum‐driven photocatalysis remains a challenging pursuit for light‐chemical energy conversion. Integrating plasmonic nanostructures with localized surface plasmon resonance (LSPR) effect as light absorber onto photocatalyst can realize broad spectral response as well as promote light to energy conversion. Herein, oxygen‐vacancy‐rich W 18 O 49 as plasmon antenna was coupled with CdS to form an S‐scheme CdS/W 18 O 49 heterojunction demonstrating photocatalytic H 2 generation activity under a broad‐spectrum light irradiation. Upon exposure to visible light, the CdS/W 18 O 49 heterojunction illustrates the best photocatalytic H 2 generation rate of 5.9 mmol g −1 h −1 , which is 2.6 times higher than CdS; and its external quantum efficiency achieves 0.17% and 0.05% at 550 and 650 nm, respectively. This activity enhancement is attributed to the enhanced light‐harvesting ability and faster charge separation induced by the LSPR effect of the W 18 O 49 plasmon with rich oxygen vacancies and S‐scheme transfer mechanism. This work will be beneficial to develop non‐metal plasmons assisted broad‐spectrum‐response photocatalysts.