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41 results on '"Zhou, Quanfa"'

9. Synergy of dopants and porous structures in graphitic carbon nitride for efficient photocatalytic H2 evolution

Author

Zhou Pin, Bai Jirong, Yaoyao Deng, Xu Peng, and Zhou Quanfa

Subjects
010302 applied physics, Materials science, Dopant, Process Chemistry and Technology, Doping, Graphitic carbon nitride, 02 engineering and technology, Nitride, 021001 nanoscience & nanotechnology, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, chemistry.chemical_compound, chemistry, Chemical engineering, law, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Photocatalysis, Calcination, Charge carrier, 0210 nano-technology, Carbon nitride
Abstract

Modification of the environmentally-friendly non-metallic polymer semiconductor graphite carbon nitride (g-C3N4) has been a research hotspot in the field of photocatalysis, and is regarded as a pivotal solution to energy problems. Nevertheless, the bottlenecks of a slow carrier separation rate, limited visible light absorption and weak water reduction driving force have not been effectively solved due to uneven mass and heat transfers during high-temperature calcination; therefore, no carbon nitride photocatalysts with excellent properties can be provided. Recently, optimizing the modification with multiple methods has become an important research direction. To generate better photocatalysts, we propose a facile copolymerization strategy by combining doping and pore formation to inhibit the agglomeration and efficiently optimize the surface properties and external structure of the catalyst, thereby improving its photocatalytic performances. The amended g-C3N4 produces a broadened visible-light response, a larger surface area, and reformative separate efficiency of charge carriers. Thus, the effectively-modified g-C3N4 has enhanced H2 production, which is 6.3-fold greater than that of pristine carbon nitride.

Published
2021

20. Rapid thermal surface engineering of g-C3N4 for efficient hydrogen evolution

Author

Yaoyao Deng, Zhou Quanfa, Zhou Pin, Xu Peng, Bai Jirong, and Wang Zhilei

Subjects
Photoluminescence, Materials science, Graphitic carbon nitride, General Physics and Astronomy, 02 engineering and technology, Surfaces and Interfaces, General Chemistry, Surface engineering, Nitride, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Catalysis, chemistry.chemical_compound, chemistry, Chemical engineering, Photocatalysis, 0210 nano-technology, Absorption (electromagnetic radiation), Visible spectrum
Abstract

Graphite carbon nitride (g-C3N4) is a fascinating 2D photocatalyst, but preparing ultrathin g-C3N4 with outstanding surface properties by a green and facile method is still a tremendous challenge. In this research, g-C3N4 nanosheets were modified through H2O2-assisted rapid thermal surface treatment. The rapid decomposition of H2O2 molecules on the surface greatly optimized the surface properties of the catalyst. Thus, the modified g-C3N4 nanosheets had more interfacial active sites and broader visible light absorption and showed the largest hydrogen evolution rate of 894.9 μmol g−1 h−1. Photoluminescence and electron spin resonance (ESR) assays showed that the modified photocatalyst accelerated charge transfer and thereby attained higher photocatalytic H2 generation efficiency. This research offers a new strategy to develop g-C3N4-based 2D photocatalysts for H2 preparation.

Published
2021

21. Highly-dispersed mesoporous AgPtPd nanotubes as efficient electrocatalysts for hydrogen evolution reaction

Author

Zhou Pin, Yaoyao Deng, Zhou Quanfa, Bai Jirong, Xu Peng, and Xiang Mei

Subjects
Materials science, Mechanical Engineering, Alloy, 02 engineering and technology, Overpotential, engineering.material, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Catalysis, Chemical engineering, Mechanics of Materials, engineering, General Materials Science, Hydrogen evolution, 0210 nano-technology, Mesoporous material, Current density
Abstract

A facile method was proposed to prepare mesoporous AgPtPd nanotubes (M-AgPtPd NTs) alloy electrocatalysts. The M-AgPtPd NTs presented excellent electrocatalytic activity and robust durability for H2 evolution in 1.0 M KOH solutions. Specifically, the M-AgPtPd NTs achieved a significantly lower overpotential (19.6 mV) at the current density of 10 mA∙cm−2 compared with commercial Pt/C catalysts (31.6 mV). The M-AgPtPd NTs also displayed remarkable stability after 1000 cycles. This excellent catalytic activity of the M-AgPtPd NTs electrocatalysts can be ascribed to the trimetallic characteristics and the unique mesoporous structure.

Published
2021

27. Physicochemical and isomerization property of Pt/SAPO-11 catalysts promoted by rare earths

Author

Weiqiao Liu, Jie Ren, Yuhan Sun, Zhou Quanfa, and Tongming Shang

Subjects
Geochemistry and Petrology, Chemistry, Desorption, Dispersity, Inorganic chemistry, General Chemistry, Lewis acids and bases, Fourier transform infrared spectroscopy, Brønsted–Lowry acid–base theory, Bimetallic strip, Isomerization, Catalysis
Abstract

Monometallic catalyst Pt/SAPO-11 was prepared by impregnation method. Bimetallic catalysts LaPt/SAPO-11 or CePt/SAPO-11 was prepared by sequential impregnation method. The catalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption, temperature-programmed desorption of ammonia (NH3-TPD), and Fourier transform infrared spectroscopy (FT-IR) techniques. The results showed that with the addition of rare earths the BET surface areas, pore volume, the amount of Bronsted acid and the total acidity of catalysts decreased slightly. However, the additive addition could lead to an increase in the amount of Lewis acid. Meanwhile, the introduction of additive was feasible to promote the dispersity of Pt. In addition, the hydroisomerization of n-heptane over different catalysts was studied. Compared with Pt/SAPO-11, LaPt/SAPO-11 or CePt/SAPO-11 showed higher catalytic activity and yield of i-C7 due to its higher Pt dispersion.

Published
2009

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