Journal
ADVANCED MATERIALS
Volume 33, Issue 49, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202104361
Keywords
carbon nitride; self-supporting 3D structure; solar hydrogen production; tunable n ->pi* electronic transition
Categories
Funding
- National Natural Science Foundation of China [21401017, 21236008]
- Liao Ning Revitalization Talents Program [XLYC2008032]
- Fundamental Research Funds for the Central Universities [DUT19LK17]
Ask authors/readers for more resources
Self-supporting 3D carbon nitrides with unique features such as improved charge mobility and controllable n -> pi* electronic transition have been synthesized through a facile stepwise pyrolytic strategy. By optimizing the structure and optical properties, enhanced H-2 evolution rates were achieved, demonstrating the potential for efficient photocatalytic reactions.
Self-supporting 3D (SSD) carbon nitrides (UCN-X, X = 600-690; where X represents the pyrolytic temperature) consisting of curved layers, with plenty of wrinkles and enlarged size, are synthesized via a facile stepwise pyrolytic strategy. Such unique features of the SSD structure exhibiting dramatically improved charge mobility, extended pi-conjugated aromatic system, and partial distortion of heptazine-based skeleton can not only keep the easier activation of the intrinsic pi -> pi* electronic transition but also awaken the n -> pi* electronic transition in carbon nitride. The n -> pi* electronic transition of UCN-X can be controllably tuned through changing the pyrolytic temperature, which can greatly extend the photoresponse range to 600 nm. More importantly, the change regularity of H-2 evolution rates is highly positive, correlated with the change tendency of n -> pi* electronic transition in UCN-X, suggesting the positive contribution of n -> pi* electronic transition to enhancing photocatalytic activity. The UCN-670, with optimal structural and optical properties, presents enhanced H-2 evolution rate up to 9230 mu mol g(-1) h(-1) (Pt 1.1 wt%). This work realizes the synergistic optimization of optical absorption and exciton dissociation via fabricating an SSD structure. It offers a new strategy for the development of novel carbon nitride materials for efficient photocatalytic reactions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available