期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 316, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121601
关键词
Poly(heptazine imide); H 2 production; Visible-active photocatalysts; Cellulose; Photocatalytic reforming
资金
- Ministry of Science and Technology in Taiwan [MOST-108-2811-E-006-538, MOST-110-2811-E-006-527, 107-2221E-006-111-MY3, 107-2221-E-006-110-MY3, 108-3116-F-6 012-CC1, 108-2622-8-006-014]
- Hi-GEM Research Center and the Center of Applied Nanomedicine at NCKU from The Featured Areas Research Center Program
- MOST [107-3017-E-006-003]
This study presents a structure-directed approach to synthesize potassium (K)-PHI photocatalyst with high structural intactness from various allotropes of polymeric carbon nitride (PCN), which significantly enhances H2 production under visible light. The optimization of the PCN-precursor reduces defect states and increases cyanamide functionalities, promoting photoelectron extraction by Pt-cocatalyst for efficient H2 production. Moreover, the melem-derived K-PHI exhibits excellent stability in reforming cellulose into H2 and various chemicals.
Poly(heptazine imide) (PHI) has emerged as a promising photocatalyst due to its ability to store long-lived photoelectrons. In this study, we report a structure-directed approach to synthesize potassium (K)-PHI from various allotropes of polymeric carbon nitride (PCN) for facilitating photoelectron transfer and improving H2 production under visible light. The K-PHI derived from the melem units exhibits high structural intactness and produces H2 more efficiently than the K-PHIs from other allotropes of PCN. The PCN-precursor optimization, to reduce the defect states and increase cyanamide functionalities of the K-PHI, serves as a vital factor in photoelectron extraction by Pt-cocatalyst for H2 production. Moreover, the melem-derived K-PHI steadily reforms cellulose into H2 (34 mu mol h-1) and several chemicals for 6 days. The chemicals from the cellulose-reforming comprise C6 to C1 esters, acids, aldoses, aldehydes, and alcohols. The degradation from C6 to C1 proceeds sequentially by alternating hydrolysis and photocatalytic oxidation.
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