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Enhanced CO 2 Reduction via S-Scheme Heterojunction of Amorphous/Crystalline Metal-free Carbon Nitride Photocatalysts

Chemical Engineering Journal, ISSN: 1385-8947, Vol: 500, Page: 156777
2024
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Article Description

Metal-free carbon nitride nanosheets (CNs) are promising photocatalysts, but face challenges with severe charge recombination and limited visible light absorption. To overcome these challenges, we have developed a 2D/2D amorphous/crystalline carbon nitride (CNs/CCN) S-scheme heterojunction photocatalyst through electrostatic self-assembly. The built-in electric field in the CNs/CCN heterojunction facilitates an S-scheme transfer of photogenerated electrons from CCN to CNs, effectively enhancing electron-hole separation. Our optimized CNs/CCN-1/3 heterojunction exhibits substantially higher production rates of CO and CH 4 compared to its individual components. Notably, CNs/CCN-1/3 maintains excellent CO 2 reduction efficiency even under irradiation at wavelengths exceeding 700 nm. This study introduces an innovative strategy for the development of CNs-based photocatalysts with improved charge separation and enhanced visible-light absorption.

Bibliographic Details

Liting Wu; Dingyi Yang; Yalin Dong; Ze Wang; Yu Zhang; Tingting Wang; Liang Cheng; Yong Wang; Yizhang Wu

Elsevier BV

Chemistry; Environmental Science; Chemical Engineering; Engineering

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