A Facile Steam Reforming Strategy to Delaminate Layered Carbon Nitride Semiconductors for Photoredox Catalysis

Abstract

The delamination of layered crystals that produces single or few-layered nanosheets while enabling exotic physical and chemical properties, particularly for semiconductor functions in optoelectronic applications, remains a challenge. Here, we report a facile and green approach to prepare few-layered polymeric carbon nitride (PCN) semiconductors by a one-step carbon/nitrogen steam reforming reaction. Bulky PCN, obtained from typical precursors including urea, melamine, dicyandiamide, and thiourea, are exfoliated into few-layered nanosheets, while engineering its surface carbon vacancies. The unique sheet structures with strengthened surface properties endow PCNs with more active sites, and an increased charge separation efficiency with a prolonged charge lifetime, drastically promoting their photoredox performance. After an assay of a H evolution reaction, an apparent quantum yield of 11.3 % at 405 nm was recorded for the PCN nanosheets, which is much higher than those of PCN nanosheets. This delamination method is expandable to other carbon-based 2D materials for advanced applications.

A Novel CVD Growth of g‐C3N4 Ultrathin Film on NiCo2O4 Nanoneedles/Carbon Cloth as Integrated Electrodes for Supercapacitors

“…For the XRD pattern of NiCo 2 O 4 NNs@g‐C 3 N 4 /CC, it could be clearly found that in addition to the diffraction peaks originated from CC and NiCo 2 O 4 , a diffraction peak positioned at 27.8° can be observed, which corresponding to the (002) crystal plane of g‐C 3 N 4 (JCPDS file No. 87–15),, indicating that the as‐prepared sample is made up of CC, NiCo 2 O 4 and g‐C 3 N 4 . FTIR spectra of the as‐synthesized NiCo 2 O 4 NNs@g‐C 3 N 4 also confirmed the successful coating of g‐C 3 N 4 film.…”

Reduced Oxygenated g‐C3N4 with Abundant Nitrogen Vacancies for Visible‐Light Photocatalytic Applications

“…Recently, photocatalysis has harnessed the use of solar energy in a strategy to overcome environmental problems; as a result, the development of resourceful and highly efficient photocatalysts is crucial for achieving its practical application . In the past few years, an organic skeleton material, carbon nitride, has drawn extensive attention .…”

g‐C3N4/Cu3P/UiO‐66 Ternary Composites for Enhanced Visible Light Photocatalytic H2 Evolution

“…The characteristic diffraction peaks are located at 27.5°corresponding to (002) interface ,. This characteristic peak indicates that graphite carbonitridation, has been successfully synthesized. The three stronger peaks in CNC correspond to (300), (113) and (122) interfaces in the standard Cu 3 P card, and their corresponding angles are 44.93, 45.97 and 47.07°, respectively.…”