Construction of a 3D/2D g-C 3N 4/ZnIn 2S 4 hollow spherical heterostructure for efficient CO 2 photoreduction under visible light

Author(s): Boyu Shao ¹ ^, ² ^, ³ ^, ⁴ , Junyan Wang ¹ ^, ² ^, ³ ^, ⁴ , Yizhong Zhang ¹ ^, ² ^, ³ ^, ⁴ , Xin Tan ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Wei Zhou ⁵ ^, ² ^, ³ ^, ⁴ , Yiliang Chen ⁶ ^, ² ^, ³ ^, ⁴ , Tao Xie ⁶ ^, ² ^, ³ ^, ⁴ , Tao Yu ⁶ ^, ² ^, ³ ^, ⁴ ^, ⁷

Publication date (Electronic): 2021

Journal: Catalysis Science & Technology

Publisher: Royal Society of Chemistry (RSC)

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Abstract

The 3D/2D g-C ₃N ₄/ZnIn ₂S ₄ hollow spherical heterostructure can greatly increase visible light absorption and improve the efficiency of photo-generated electron migration and conversion, resulting in an excellent CO generation rate.

Abstract

A 3D/2D g-C ₃N ₄/ZnIn ₂S ₄ hollow spherical heterostructure was constructed by growing modified ZnIn ₂S ₄ nanosheets on the surface of g-C ₃N ₄ microspheres. This composite material can not only take advantage of the hollow structure with a stronger light absorption capacity and more active sites, but its heterostructure can also increase the efficiency of photogenerated electron migration and separation, thereby improving the serious photogenerated electron recombination of two separate materials. The unique structural superiority led to excellent photocatalytic CO ₂ reduction performance, where a higher CO generation rate reaching 7368.7 μmol g ⁻¹ h ⁻¹ by using IZIS–CN100 was undoubtedly strong evidence. The heterojunction formation process and the subsequent electronic changes on both theoretical and experimental aspects of the combination of electrochemical tests and density functional theory (DFT) were verified. Finally, we proposed a feasible photocatalytic mechanism and brought forth new ideas in the application of materials, structural control, and the combination of theories and experiments.

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Alkali-Assisted Synthesis of Nitrogen Deficient Graphitic Carbon Nitride with Tunable Band Structures for Efficient Visible-Light-Driven Hydrogen Evolution

Chao Zhou, Tierui Zhang, Chen-Ho Tung … (2017)

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Photocatalytic conversion of CO(2) into renewable hydrocarbon fuels: state-of-the-art accomplishment, challenges, and prospects.

Wenguang Tu, Yong-Ming Zhou, Zhigang Zou (2014)

Photocatalytic reduction of CO2 into hydrocarbon fuels, an artificial photosynthesis, is based on the simulation of natural photosynthesis in green plants, whereby O2 and carbohydrates are produced from H2 O and CO2 using sunlight as an energy source. It couples the reductive half-reaction of CO2 fixation with a matched oxidative half-reaction such as water oxidation, to achieve a carbon neutral cycle, which is like killing two birds with one stone in terms of saving the environment and supplying future energy. The present review provides an overview and highlights recent state-of-the-art accomplishments of overcoming the drawback of low photoconversion efficiency and selectivity through the design of highly active photocatalysts from the point of adsorption of reactants, charge separation and transport, light harvesting, and CO2 activation. It specifically includes: i) band-structure engineering, ii) nanostructuralization, iii) surface oxygen vacancy engineering, iv) macro-/meso-/microporous structuralization, v) exposed facet engineering, vi) co-catalysts, vii) the development of a Z-scheme system. The challenges and prospects for future development of this field are also present.

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Graphitic Carbon Nitride Polymers toward Sustainable Photoredox Catalysis.

Yun Zheng, Lihua Lin, Bo Wang … (2015)

As a promising two-dimensional conjugated polymer, graphitic carbon nitride (g-C3 N4 ) has been utilized as a low-cost, robust, metal-free, and visible-light-active photocatalyst in the field of solar energy conversion. This Review mainly describes the latest advances in g-C3 N4 photocatalysts for water splitting. Their application in CO2 conversion, organosynthesis, and environmental purification is also briefly discussed. The methods to modify the electronic structure, nanostructure, crystal structure, and heterostructure of g-C3 N4 , together with correlations between its structure and performance are illustrated. Perspectives on the challenges and opportunities for the future exploration of g-C3 N4 photocatalysts are provided. This Review will promote the utilization of g-C3 N4 materials in the fields of photocatalysis, energy conversion, environmental remediation, and sensors.