journal article·2021-09-01

Constructing van der Waals Heterogeneous Photocatalysts Based on Atomically Thin Carbon Nitride Sheets and Graphdiyne for Highly Efficient Photocatalytic Conversion of CO2 into CO

Yong Wang, Yu Zhang, Yongmei Wang, Chengxin Zeng, Mei Sun, Dingyi Yang, Ke Cao, Hongzhe Pan, Yizhang Wu, Hong Liu, Rusen Yang

ACS Applied Materials & Interfaces· Volume 13· Issue 34
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Abstract

Atomically thin two-dimensional (2D) carbon nitride sheets (CNs) are attracting attention in the field of photocatalytic CO2 reduction. Because of the rapid recombination of photogenerated electron–hole pairs and limited more active sites, the photocatalytic efficiency of CNs cannot meet the actual requirements. Here, atomically thin 2D/2D van der Waals heterostructures of metal-free graphdiyne (GDY)/CNs are fabricated through a simple electrostatic self-assembly method. Experimental characterizations along with first-principles calculations show that the introduction of GDY in CNs promoted the transport of photogenerated carriers in the melon chain, thus suppressing the recombination of photogenerated electron–hole pairs. Both in situ FTIR measurements and DFT calculation confirm that the introduced GDY served as the CO2 adsorption site and enhanced the CO2 adsorption capacity of the CNs/GDY heterostructure. Thanks to the 2D/2D van der Waals heterojunction, the optimized CNs/GDY enhances significantly the CO generation rate up to 95.8 μmol g–1 that is 19.2-fold higher than that of CNs. This work provides a viable approach for the design of metal-free van der Waals heterostructure-based photocatalysts with high catalytic activity.
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Research context

OpenAlex topics: Advanced Photocatalysis Techniques · Covalent Organic Framework Applications · CO2 Reduction Techniques and Catalysts

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Academy of Advanced Interdisciplinary Research, School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, China

Department of Physics, Shaanxi University of Science and Technology, Xi’an 710021, China

School of Physics and Electronic Engineering, Linyi University, Linyi 276005, China

National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, China

State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan, Shandong 250022, P. R. China

Funding

Ministry of Education of the People's Republic of China · Natural Science Foundation of Shandong Province · Natural Science Foundation of Shaanxi Province

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