Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 2, Pages 2050-2059Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b17757
Keywords
3D hierarchical g-C3N4 architectures; ultrathin self-doped nanosheets; tunable band structures; photocatalytic hydrogen evolution
Funding
- National Natural Science Foundation of China [21707043]
- Natural Science Foundation of Shandong Province [ZR2017BEE005]
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Photocatalytic hydrogen evolution has broad prospects as a clean solution for the energy crisis. However, the rational design of catalyst complex, the H-2 evolution efficiency, and the yield are great challenge. Herein, three-dimensional hierarchical g-C3N4 architectures assembled by ultrathin carbon-rich nanosheets (3D CCNS) were prepared via an extremely facile hexamethylenetetramine activation approach at the bulk scale, indicating the validation of scale-up production process. The two-dimensional ultrathin carbon-rich nanosheets were several hundred nanometers in width but only 5-6 nm in thickness and gave rise to a unique 3D interconnected network. The unique composition and structure of the nanosheets endow them with a remarkable light absorption spectrum with the tunable band gap, high electrical conductivity, fast charge separation, and large surface areas with abundant reaction active sites, and thus significantly improved H-2 production performance. As high as similar to 7.8%, quantum efficiency can be achieved by irradiating 3D CCNS at 420 nm with a H-2 evolution rate >2.7 x 10(4) mu mol/g/h, which is similar to 31.3 times higher than that of the pristine g-C3N4. Our work introduces an extremely facile route for mass production of doping modified 3D g-C3N4-based photocatalyst with excellent H-2 evolution performances.
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