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An Inorganic/Organic S‐Scheme Heterojunction H 2 ‐Production Photocatalyst and its Charge Transfer Mechanism
Author(s) -
Cheng Chang,
He Bowen,
Fan Jiajie,
Cheng Bei,
Cao Shaowen,
Yu Jiaguo
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100317
Subject(s) - materials science , heterojunction , photocatalysis , x ray photoelectron spectroscopy , substrate (aquarium) , photochemistry , quantum efficiency , semiconductor , chemical engineering , pyrene , triphenylamine , photodegradation , nanotechnology , optoelectronics , catalysis , organic chemistry , chemistry , oceanography , engineering , geology
Inspired by natural photosynthesis, constructing inorganic/organic heterojunctions is regarded as an effective strategy to design high‐efficiency photocatalysts. Herein, a step (S)‐scheme heterojunction photocatalyst is prepared by in situ growth of an inorganic semiconductor firmly on an organic semiconductor. A new pyrene‐based conjugated polymer, pyrene‐ alt ‐triphenylamine (PT), is synthesized via the typical Suzuki–Miyaura reactions, and then employed as a substrate to anchor CdS nanocrystals. The optimized CdS/PT composite, coupling 2 wt% PT with CdS, exhibits a robust H 2 evolution rate of 9.28 mmol h −1 g −1 with continuous release of H 2 bubbles, as well as a high apparent quantum efficiency of 24.3%, which is ≈8 times that of pure CdS. The S‐scheme charge transfer mechanism between PT and CdS, is systematically demonstrated by photoirradiated Kelvin probe measurement and in situ irradiated X‐ray photoelectron spectroscopy analyses. This work provides a protocol for preparing specific S‐scheme heterojunction photocatalysts on the basis of inorganic/organic coupling.