Journal
NANO ENERGY
Volume 89, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106332
Keywords
Ultrahigh nitrogen-doping; Graphitic carbon nitride; Pyridinic nitrogen; Carbon materials; Triiodide reduction
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51872035, U1710117]
- Talent Program of Rejuvenation of the Liaoning [XLYC1807002]
- Fundamental Research Funds for the Central Universities [DUT19LAB20]
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Nitrogen doping in graphene effectively modulates the charge density of carbon atoms, with the activity improving as the N content increases. A proof-of-concept study demonstrates a high nitrogen doping level of up to 12.4 at% in carbon materials through mechanochemistry-driven prelinking. Higher N-doping can induce more carbon atoms to be active for triiodide reduction, leading to a power conversion efficiency of 8.86%.
Nitrogen (N)-doping in graphene is now known to effectively modulate the charge density of carbon atoms, rendering the carbon materials catalytic activity. Often, the activity improves with increasing the N content. Although, as early as 2015 (Zhang et al., 2015) theoretical investigation has anticipated that it is possible to realize a high N-doping level through improving pyridinic N, by which there is still a lack of experimental verification what a doping level can be reached up to now. Herein, as a proof-of-concept study, we demonstrate, through mechanochemistry-driven prelinking to enhance the interaction between graphitic carbon nitride and graphitic lattice to preferably form pyridinic N (the maximum proportion thus obtained is 47.7%), that an ultrahigh N up to 12.4 at% is doped in the as-prepared carbon materials at a carbonization temperature up to 1000 degrees C. As an example, the higher N-doping can induce more carbon atoms, especially those adjacent to the pyridinic N, to be active for triiodide reduction, resulting in a wonderful power conversion efficiency of 8.86%.
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