期刊
APPLIED SURFACE SCIENCE
卷 616, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2023.156523
关键词
Carbon nitride; Exciton effect; Solar energy storage; Photocatalytic hydrogen evolution
In this study, highly crystalline carbon nitride sheets were prepared using a integrated strategy involving spatially restricted growth in solid salt media and hydrochloric acid induced exfoliation. The growth of carbon nitride was induced by K+ ions in the confined space of the solid salt, and K+ ions diffused into the carbon nitride bulk phase with feasible paths. Pickling was also used to control the K+ concentration gradient distribution and regulate the charge characteristic of cyanoamino. The carbon nitride dual-functionalized with cyanoamino and K+ (KCCN) exhibited improved photocatalytic performance with significantly higher hydrogen evolution efficiency and quantum efficiency compared to ordinary carbon nitride.
Two-dimensional carbon nitride nanosheets continue to attract attention in photocatalysis, but inefficient exciton dissociation and charge separation limit further improvement of their photocatalytic performance. Herein, we have prepared highly crystalline carbon nitride sheets using a integrated strategy of spatially restricted growth in solid salt media and hydrochloric acid induced exfoliation. In the confined space of the solid salt, K+ induce the ordered growth of carbon nitride and diffuse into the carbon nitride bulk phase with thermodynamically feasible paths. Pickling was also found to control the K+ concentration gradient distribution and regulate the charge characteristic of cyanoamino, thereby controlling the quantity and activity of trapped long-lived electrons. The storage free electron behavior of carbon nitride dual-functionalized with cyanoamino and K+ (KCCN) greatly facilitates the dissociation of excitons, resulting in photocatalytic hydrogen evolution efficiency of 10.78 mmol.g(-1).h(-1), which was 49 times higher than that of ordinary carbon nitride. KCCN had a hydrogen production quantum efficiency of 27.79%, higher than the majority of the similar materials reported. This study provides new insights into the design of more excellent carbon nitride-based photocatalysts through exciton engineering.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据