Citation: Qingfeng Li, Can Ren, Chuntian Qiu, Tingchao He, Qitao Zhang, Xiang Ling, Yangsen Xu, Chenliang Su. Promoting near-infrared photocatalytic activity of carbon-doped carbon nitride via solid alkali activation[J]. Chinese Chemical Letters, ;2021, 32(11): 3463-3468. doi: 10.1016/j.cclet.2021.05.039 shu

Promoting near-infrared photocatalytic activity of carbon-doped carbon nitride via solid alkali activation

Qingfeng Li ^a ,
Can Ren ^b ,
Chuntian Qiu ^a ,
Tingchao He ^b ,
Qitao Zhang ^a ,
Xiang Ling ^a ,
Yangsen Xu ^{a, *,} ,
Chenliang Su ^a

a.
International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China
b.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China

xuys2017@szu.edu.cn

Received Date: 9 March 2021
Revised Date: 8 April 2021
Accepted Date: 20 May 2021
Available Online: 24 May 2021

Figures(4)

Ultrabroad spectral absorption is required for semiconductor photocatalysts utilized for solar-to-chemical energy conversion. The light response range can be extended by element doping, but the photocatalytic performance is generally not enhanced correspondingly. Here we present a solid alkali activation strategy to synthesize near-infrared (NIR) light-activated carbon-doped polymeric carbon nitride (A-cPCN) by combining the copolymerization of melamine and 1, 3, 5-trimesic acid. The prepared A-cPCN is highly crystalline with a narrowed bandgap and enhanced efficiency in the separation of photogenerated electrons and holes. Under irradiation with NIR light (780 nm ≥ λ ≥ 700 nm), A-cPCN shows an excellent photocatalytic activity for H₂ generation from water with rate of 165 µmol g⁻¹ h⁻¹, and the photo-redox activity for H₂O₂ production (109 µmol g⁻¹ h⁻¹) from H₂O and O₂, whereas no observed photocatalytic activity over pure PCN. The NIR photocatalytic activity is due to carbon doping, which leads to the formation of an interband level, and the alkali activation that achieved shrinking the transfer distance of photocarriers. The current synergistic strategy may open insights to fabricate other carbon-nitrogen-based photocatalysts for enhanced solar energy capture and conversion.
- Near-infrared (NIR) light,
- Doping,
- Polymeric carbon nitride (PCN),
- Photocatalysis,
- Water splitting
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