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Graphitic carbon nitride-based photocatalysts in the applications of environmental catalysis 认领 引用 被引量：8
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作者 Hongxia Lin JinmoWu +7 位作者 Fan Zhou Xiaolong Zhao Pengfei Lu Guanghui Sun Yuhan Song Yayun Li Xiaoyong Liu Hongxing Dai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2023年第2期570-590,共21页
Semiconductor photocatalytic technology has shown great prospects in converting solar energy into chemical energy to mitigate energy crisis and solve environmental pollution problems.The key issue is the development o... Semiconductor photocatalytic technology has shown great prospects in converting solar energy into chemical energy to mitigate energy crisis and solve environmental pollution problems.The key issue is the development of high-efficiency photocatalysts.Various strategies in the state-of-the-art advancements,such as heterostructure construction,heteroatom doping,metal/single atom loading,and defect engineering,have been presented for the graphitic carbon nitride(g-C3N4)-based nanocomposite catalysts to design their surface chemical environments and internal electronic structures to make them more suitable for different photocatalytic applications.In this review,nanoarchitecture design,synthesis methods,photochemical properties,potential photocatalytic applications,and related reaction mechanisms of the modified high-efficiency carbon nitride-based photocatalysts were briefly summarized.The superior photocatalytic performance was identified to be associated with the enhanced visible-light response,fast photoinduced electron-hole separation,efficient charge migration,and increased unsaturated active sites.Moreover,the further advance of the visible-light harvesting and solar-to-energy conversions are proposed. 展开更多
关键词 Graphitic carbon nitride-based photocatalyst Photocatalytic reduction Photocatalytic degradation Chemical modification Heterostructure construction Metal doping
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Vibration Spectra of Quasi-confined Optical Phonon Modes in an Asymmetric Wurtzite AlxGa1-xN/GaN/AlyGa1-yN Quantum Well 认领 引用 被引量：2
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作者 ZHANG Li SHI Jun-Jie 《Communications in Theoretical Physics》 SCIE CAS 2007年第2期349-354,共6页
Based on the dielectric continuum model and Loudon＇s uniaxial crystal model, the properties of the quasi. confined （QC） optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wur... Based on the dielectric continuum model and Loudon＇s uniaxial crystal model, the properties of the quasi. confined （QC） optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wurtzite quantum well （QW） are deduced via the method of electrostatic .potential expanding. The present theoretical scheme can naturally reduce to the results in symmetric wurtzite QW once a set of symmetric structural parameters are chosen. Numerical calculations on an asymmetric AlN/GaN/AIo,15 Gao.85N Wurtzite Q W are performed. A detailed comparison with the symmetric wurtzite QW was also performed. The results show that the structural asymmetry of wurtzite QW changes greatly the dispersion frequencies and the electrostatic potential distributions of the QC optical phonon modes. 展开更多
关键词 quasi-confined optical phonon asymmetric wurtzite QW nitride-based semiconductor
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A novel efficient preparation route for BN matrix composites reinforced with Al2O3fibers based on textured design 认领 引用
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作者 Bo Wang Delong Cai +5 位作者 Xiaoming Duan Zhihua Yang Daxin Li Zhenxi Lu Dechang Jia Yu Zhou 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2026年第3期59-69,共11页
Conventional boron nitride(BN)-based composites are often limited by high porosity and long processing cycles,which severely restrict their mechanical performance and engineering applications.To overcome these limitat... Conventional boron nitride(BN)-based composites are often limited by high porosity and long processing cycles,which severely restrict their mechanical performance and engineering applications.To overcome these limitations,a novel organic-inorganic hybrid matrix combined with a hot-compression orientation strategy is proposed.Liquid-phase polyborazylene(PBZ)was employed to promote the rearrangement and alignment of h-BN lamellae during pressing,and subsequent pyrolysis yielded a dense and continuous BN matrix with in situ precipitated nanocrystals serving as loadtransfer nodes.This process significantly enhanced densification,reduced porosity,and enabled the construction of an ordered lamellar structure.Unlike conventional PIP processes that typically require~10 repeated infiltration-pyrolysis cycles,this method achieves dense composites in a single pyrolysis step,effectively avoiding fiber damage and greatly shortening the fabrication cycle.The synergistic effects of aligned lamellae inducing extended crack propagation paths and in situ nanocrystals providing additional load-transfer mechanisms effectively improved the mechanical performance of the composites.The proposed PBZ-assisted hybrid matrix and lamellar-orientation design strategy offers a new and efficient route for developing high-performance BN-based composites with excellent wave-transmitting and thermal protection capabilities. 展开更多
关键词 boron nitride-based composites curing and pyrolysis of polyborazylene lamellar alignment mechanical properties
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Facile and direct approach to synthesize nitride based catalysts for ammonia synthesis 认领 引用
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作者 Zhenzhan Zhang Jiafeng Yu +9 位作者 Jiarui Li Xiaoyan Dong Feng Bao Chunhua Tang Wei Shao Peiyang Xie Helong Jia Tianying Xu Jian Sun Hui Li 《Green Chemical Engineering》 EI CAS CSCD 2026年第4期399-406,共8页
Nitride based catalysts have recently emerged as efficient non-precious metal catalysts for ammonia synthesis,overcoming traditional scale-relationship limitations.However,their synthesis is often hindered by high moi... Nitride based catalysts have recently emerged as efficient non-precious metal catalysts for ammonia synthesis,overcoming traditional scale-relationship limitations.However,their synthesis is often hindered by high moisture sensitivity,and the use of toxic reagents presents both procedural and environmental challenges.In this study,we introduce an innovative argon plasma sputtering method to tackle the above challenges for the fabrication of nitride based catalysts.This self-created approach enables the direct use of as-prepared catalysts in ammonia synthesis,eliminating the need for additional reduction steps and streamlining the process from synthesis to application,and more importantly,the Ni nanoparticles exhibit smaller sizes(4.04 nm)compared to those produced by chemical vapor deposition,with no aggregation observed after ammonia synthesis.Additionally,a time delay was demonstrated via in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)between nitrogen adsorption and conversion,partially supporting the“dual active site”concept.The rate-determining step of the ammonia synthesis reaction is supposed not to be nitrogen activation but rather the subsequent hydrogenation of nitrogen species or the desorption of NH3.These findings highlight the advantages of the sputtering method and present a promising and environmentally friendly approach to developing heterogeneous catalysts for ammonia synthesis. 展开更多
关键词 Ammonia synthesis Physical sputtering Ni nanoparticles Nitride-based catalyst
Underwater wireless optical NOMA communication experiment system exploiting GaN-based micro-LED array grouping 认领 引用 被引量：1
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作者 梁彦军 殷洪玺 +2 位作者 黄安 季秀阳 王建英 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第3期1-6,共6页
This paper has proposed an experimental system for non-orthogonal multiple access(NOMA)wireless optical communication in challenging underwater turbulent environments,employing the gallium nitride(GaN)-based micro-LED... This paper has proposed an experimental system for non-orthogonal multiple access(NOMA)wireless optical communication in challenging underwater turbulent environments,employing the gallium nitride(GaN)-based micro-LED array.This design of the GaN-based micro-LED array enables the independent transmission of signals from distinct data streams within the NOMA framework,facilitating direct optical power-domain superposition of NOMA signals.The experimental setup involves emulating oceanic turbulence channels,characterized by varying the level of scintillation intensity,to thoroughly investigate the bit error rate(BER)performance.The outcomes unequivocally demonstrate the superiority of our proposed NOMA scheme,as compared to conventional circuit-driven optical NOMA systems utilizing fixed LED array grouping,particularly in the presence of turbulent underwater channels.The proposed NOMA scheme exhibits consistently superior BER performance and maintains excellent linearity at the lower frequencies while effectively mitigating signal distortion at the higher frequencies. 展开更多
关键词 optical non-orthogonal multiple access gallium nitride-based micro-LED array oceanic turbulence channels bit error rate
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