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Plasma-exfoliated g-c_(3)N_(4) with oxygen doping: tailoring photocatalytic properties

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Frontiers of chemical Science and Engineering 2024年第2期18卷 27-39页

作者： Yuxin Li Junxin Guo Rui han Zhao Wang National Engineering Research centre of Industry crystallization Technology School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Heteroatom doping and defect engineering have been proposed as effective ways to modulate the energy band structure and improve the photocatalytic activity of g-c_(3)N_(4). In this work, ultrathin defective g-c_(3)N_(4) was successfully prepared using cold plasma. Plasma exfoliation reduces the thickness of g-c_(3)N_(4) from 10 nm to 3 nm, while simultaneously introducing a large number of nitrogen defects and oxygen atoms into g-c_(3)N_(4). The amount of doped O was regulated by varying the time and power of the plasma treatment. Due to N vacancies, O atoms formed strong bonds with c atoms, resulting in O doping in g-c_(3)N_(4). The mec.anism of plasma treatment involves oxygen etching and gas expansion. Photocatalytic experiments demonstrated that appropriate amount of O doping improved the photocatalytic degradation of rhodamine B compared with pure g-c_(3)N_(4). The introduction of O optimized the energy band structure and photoelectric properties of g-c_(3)N_(4). Active species trapping experiments revealed ·O_(2)^(–) as the main active species during the degradation.

关键词： graphitic carbon nitride cold plasma oxygen doping nitrogen defect visible-light photocatalysis

Isomeric fluorescence sensors for wide range detection of ionizing radiations

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Defence Technology（防务技术） 2024年第4期34卷 247-257页

作者： Jimin han Tianyu Yang Li Yang Yuanjian Li State Key Laboratory of Explosion Science and Technology of china Beijing Institute of TechnologyBeijing 100081China chongqing Innovation center Beijing Institute of TechnologyChongqing 401120China

In order to achieve a wider range of ionizing radiations detection,novel fluorescence sensing materials have been developed that utilize the fluorescence enhancement phenomenon caused by the intramolecular photoinduced electron transfer(PET)*** perylene diimide isomers PDI-P and PDI-B were designed and synthesized,and their molecular structures were characterized by high-resolution Fourier transform mass spectrometry(HRMS),nuclear magnetic resonance hydrogen and carbon spectroscopy(~1H and~(13)c NMR).The interaction between ionizing radiation and fluorescent molecules was simulated by Hcl *** results show that combining PDIs and Hcl can improve fluorescence through the retro-PET *** the similarities in chemical structures,the fluorescent enhancement multiple of PDI-B with aromatic amine as electron donor is much higher than that of PDI-P with alkyl *** the direct irradiation experiments of ionizing radiation,the emission enhancement multiples of PDI-P and PDI-B are 2.01 and 45.4,***,density functional theory(DFT)and time-dependent density functional theory(TDDFT)calculations indicate that the HOMO and HOMO-1 energy ranges of PDI-P and PDI-B are 0.54 e V and 1.13 e V,respectively.A wider energy range has a stronger driving force on electrons,which is conducive to fluorescence *** femtosecond transient absorption spectroscopy(fs-TAS)and transient fluorescence spectroscopy(TFS)tests show that PDI-B has shorter charge separation lifetime and higher electron transfer rate *** both isomers can significantly reduce LOD during PET process,PDI-B with aromatic amine has a wider detection range of 0.118—240 Gy due to its larger emission enhancement,which is a leap of three orders of *** breaks through the detection range of gamma radiation reported in existing studies,and provides theoretical support for the further study of sensitive and effective new materials for ionizing radiation dete

关键词： Perylene imide Intramolecular PET Ionizing radiation detection Fluorescence sensor Isomers

Reliability analysis of multimodal scene matching based on correlation peaks

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cHINESE JOURNAL OF AERONAUTIcS 2024年第9期37卷 433-447页

作者： Yu, Zhirui Zhu, Bai han, Zhiqiang Ye, Yuanxin Southwest Jiaotong Univ Fac Geosci & Engn Chengdu 611756 Peoples R China

The navigation system plays a pivotal role in guiding aircraft along designated routes, ensuring precise and punctual arrival at destinations. The integration of scene matching with an inertial navigation system enhances the capability of providing a dependable guarantee for successful accomplishment of flight missions. Nonetheless, assuring reliability in scene matching encounters significant challenges in areas characterized by repetitive or weak textures. To tackle these challenges, we propose a novel method to assess the reliability of scene matching based on the distinctive characteristics of correlation peaks. The proposed method leverages the fact that the similarity of the optimal matching result is significantly higher than that of the surrounding area, and three novel indicators (e.g., relative height, slope of a correlation peak, and ratio of a sub peak to the main peak) are determined to conjointly evaluate the reliability of scene matching. The proposed method entails matching a real-time image with a reference image to generate a correlation surface. A correlation peak is then obtained by extracting the portion of the correlation surface exhibiting a significant gradient. Additionally, the matching reliability is determined by considering the relative height, slope, and ratio of the peak collectively. Exhaustive experimental results with two sets of data demonstrate that the proposed method significantly outperforms traditional approaches in terms of precision, recall, and F1-score. These experiments also establish the efficacy of the proposed method in achieving reliable matching in challenging environments characterized by repetitive and weak textures. This enhancement holds the potential to significantly elevate scene-matching-based navigation. (c) 2024 Production and hosting by Elsevier Ltd. on behalf of chinese Society of Aeronautics and Astronautics. This is an open access article under the cc BY-Nc-ND license.

关键词： Unmanned aerial vehicle Scene matching navigation Multimodal scene matching correlation peak Reliability analysis SAR REGISTRATION IMAGES FRAMEWORK

An optimized time-adaptive aerothermal coupling calculation method for aerothermal analysis of disc cavity system

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cHINESE JOURNAL OF AERONAUTIcS 2024年第9期37卷 164-177页

作者： Bi, Shuai Mao, Junkui Wang, Lei han, Feng Nanjing Univ Aeronaut & Astronaut Coll Energy & Power Engn Nanjing 210016 Peoples R China Nanjing Univ Aeronaut & Astronaut Integrated Energy Inst Nanjing 210016 Peoples R China AEcc Aeroengine control Syst Inst Wuxi 214063 Peoples R China

In order to further achieve the balance between the calculation accuracy and efficiency of the transient analysis of the aero-engine disc cavity system, an Optimized Time-adaptive Aerothermal coupling calculation (OTAc) method has been proposed. It combines one-dimensional transient calculation of air system, conventional Sequence Staggered (cSS) method, Time-adaptive Aerothermal coupling calculation (TAc) method and differential evolution optimization algorithm to obtain an efficient and high-precision aerothermal coupling calculation method of air system. considering both the heat conduction in the solid domain and the flow in the fluid domain as unsteady states in the OTAc, the interaction of fluid-solid information within a single coupling time step size was implemented based on the cSS method. Furthermore, the coupling time step size was automatically adjusted with the number of iterations by using the Proportional-Integral-Deri vative (PID) controller. Results show that when compared with the traditional loosely coupling method with a fixed time step size, the computational accuracy and efficiency of the OTAc method are improved by 8.9% and 30%, respectively. compared with the tight coupling calculation, the OTAc method can achieve a speedup of 1 to 2 orders of magnitude, while the calculation error is maintained within 6.1%. (c) 2024 Production and hosting by Elsevier Ltd. on behalf of chinese Society of Aeronautics and Astronautics This is an open access article under the cc BY-Nc-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Air system 1D-3D coupling conjugate heat transfer Transient calculation Adaptive time step size

Topology of charged AdS black hole in restricted phase space

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chinese Physics c 2024年第9期48卷 291-299页

作者： han Wang Yun-Zhi Du college of Mathematics and Statistics Shanxi Datong UniversityDatong 037009China Department of Physics Shanxi Datong UniversityDatong 037009China Institute of Theoretical Physics Shanxi Datong UniversityDatong 037009China

The local topological properties of black hole systems can be expressed through winding numbers as *** date,AdS black hole thermodynamics are often depicted by the dual parameters of(T,S),(P,V),(Φ,Q) in the extended phase space,while there have been several studies on the black hole thermodynamics in the restricted phase *** this paper,we analyze the topological properties of charged AdS black holes in the restricted phase space under the higher-dimension and higher-order curvature gravity *** results show that the topological number of the charged black hole in the same canonical ensembles is a constant and is independent of the concrete dual thermodynamical ***,the topological number in the grand canonical ensemble is different from that in the canonical ensemble for the same black hole ***,these results are independent of dimension d and highe st order k of the Lanczos-Lovelock densities.

关键词： topology phase transition black hole

Sulfate-assisted Ni/Fe-based electrodes for anion exc.ange membrane saline splitting

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Nano Research 2024年第7期17卷 5985-5995页

作者： Yujun han Li Shao Yuhang Liu Guodong Li Tongzhou Wang Xuerong Zheng Jihong Li Xiaopeng han Wenbin Hu Yida Deng School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China State Key Laboratory of Marine Resource Utilization in South china Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China State Key Laboratory of Inorganic Synthesis and Preparative chemistry College of ChemistryJilin UniversityChangchun 130012China Key Laboratory of Advanced Energy Materials chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Saline water electrolysis is an appealing strategy for hydrogen production,attracting more attention in recent ***-based electrodes exhibit promise as catalysts for saline water ***,they suffer from the inferior service life of the oxygen evolution reaction(OER).Herein,we report an oxygen-evolution electrode consisting of a sulfate-modulated nickel-iron hydroxide(NiFeOOH)affording as the catalytic active layer and Fe-Ni_(3)S_(2) as the corrosion-proof *** developed electrode only requires overpotentials of 220 and 292 mV to deliver the current density of 10 and 500 mA·cm^(−2),*** importantly,it presents long-term stability exceeding 140 and 100 h in 1 M KOH at high current densities of 500 and 1000 mA·cm^(−2),respectively,as well as 120 h for saline water electrolysis at 100 mA·cm^(−2).Experimental results reveal that the generated sulfate plays an indispensable role in improving stability and corrosion *** assembled and tested an anion exc.ange membrane electrolyzer with Pt/c.and NiFeS/NIF as the cathode and anode,respectively,under industrial *** overall water-splitting electrolyzer achieves an impressive energy conversion efficiency of 75%±0.5%.This report offers fresh insights into the design of stable NiFe-based electrodes,which may further promote its practical applications for saline water electrolysis.

关键词： saline water electrolysis oxygen evolution reaction anode material water splitting

Macroporous Directed and Interconnected carbon Architectures Endow Amorphous Silicon Nanodots as Low‑Strain and Fast‑charging Anode for Lithium‑Ion Batteries

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Nano-Micro Letters 2024年第5期16卷 333-351页

作者： Zhenwei Li Meisheng han Peilun Yu Junsheng Lin Jie Yu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Engineering Lab for Supercapacitor MaterialsSchool of Material Science and EngineeringHarbin Institute of TechnologyShenzhenUniversity TownShenzhen 518055People’s Republic of China Songshan Lake Materials Laboratory Dongguan Dongguan 523808GuangdongPeople’s Republic of China Department of Mec.anical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China

Fabricating low-strain and fast-charging silicon-carbon composite anodes is highly desired but remains a huge challenge for lithium-ion ***,we report a unique silicon-carbon composite fabricated by uniformly dis-persing amorphous Si nanodots(SiNDs)in carbon nanospheres(SiNDs/c)that are welded on the wall of the macroporous carbon framework(MPcF)by vertical graphene(VG),labeled as MPcF@VG@SiNDs/*** high dispersity and amor-phous features of ultrasmall SiNDs(~0.7 nm),the flexible and directed electron/Li+transport c.annels of VG,and the MPcF impart the MPcF@VG@SiNDs/c more lithium storage sites,rapid Li+transport path,and unique low-strain property during Li+***,the MPcF@VG@SiNDs/c exhibits high cycle stability(1301.4 mAh g^(-1) at 1 A g^(-1) after 1000 cycles without apparent decay)and high rate capacity(910.3 mAh g^(-1),20 A g^(-1))in half cells based on industrial electrode *** assembled pouch full cell delivers a high energy density(1694.0 Wh L^(-1);602.8 Wh kg^(-1))and an excellent fast-charging capability(498.5 Wh kg^(-1),charging for 16.8 min at 3 c).This study opens new possibilities for preparing advanced silicon-carbon com-posite anodes for practical applications.

关键词： Amorphous Si nanodots Low-strain Fast-charging Lithium-ion batteries

Light-Activated Virtual Sensor Array with Machine Learning for Non-Invasive Diagnosis of coronary Heart Disease

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Nano-Micro Letters 2024年第12期16卷 427-448页

作者： Jiawang Hu Hao Qian Sanyang han Ping Zhang Yuan Lu Department of chemical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084People’s Republic of China Department of cardiology Xuanwu HospitalCapital Medical UniversityBeijing 100053People’s Republic of China Department of cardiology Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 102218People’s Republic of China Institute of Biopharmaceutical and Health Engineering Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China

Early non-invasive diagnosis of coronary heart disease(cHD)is ***,it is challenging to achieve accurate cHD diagnosis via detecting *** this work,heterostructured complexes of black phosphorus(BP)and two-dimensional carbide and nitride(MXene)with high gas sensitivity and photo responsiveness were formulated using a self-assembly strategy.A light-activated virtual sensor array(LAVSA)based on BP/Ti_(3)c_(2)Tx was prepared under photomodulation and further assembled into an instant gas sensing platform(IGSP).In addition,a machine learning(ML)algorithm was introduced to help the IGSP detect and recognize the signals of breath samples to diagnose *** to the synergistic effect of BP and Ti_(3)c_(2)Tx as well as photo excitation,the synthesized heterostructured complexes exhibited higher performance than pristine Ti_(3)c_(2)Tx,with a response value 26%higher than that of pristine Ti_(3)c_(2)*** addition,with the help of a pattern recognition algorithm,LAVSA successfully detected and identified 15 odor molecules affiliated with alcohols,ketones,aldehydes,esters,and ***,with the assistance of ML,the IGSP achieved 69.2%accuracy in detecting the breath odor of 45 volunteers from healthy people and cHD *** conclusion,an immediate,low-cost,and accurate prototype was designed and fabricated for the noninvasive diagnosis of cHD,which provided a generalized solution for diagnosing other diseases and other more complex application scenarios.

关键词： Black phosphorus/MXene heterostructures Light-activated virtual sensor array Diagnosis of coronary heart disease Machine learning

cross-upgrading of biomass hydrothermal carbonization and pyrolysis for high quality blast furnace injection fuel production:Physicochemical characteristics and gasification kinetics analysis

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 268-281页

作者： han Dang Runsheng Xu Jianliang Zhang Mingyong Wang Jinhua Li State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of chemical Engineering The University of QueenslandQueensland 4072Australia

The paper proposes a biomass cross-upgrading process that combines hydrothermal carbonization and pyrolysis to produce high-quality blast furnace injection *** results showed that after upgrading,the volatile content of biochar ranged from 16.19%to 45.35%,and the alkali metal content,ash content,and specific surface area were significantly *** optimal route for biochar pro-duction is hydrothermal carbonization-pyrolysis(P-Hc),resulting in biochar with a higher calorific value,c=c structure,and increased graphitization *** apparent activation energy(E)of the sample ranges from 199.1 to 324.8 kJ/mol,with P-Hc having an E of 277.8 kJ/mol,lower than that of raw biomass,primary biochar,and *** makes P-Hc more suitable for blast furnace injection ***,the paper proposes a path for P-Hc injection in blast furnaces and calculates potential environmental benefits.P-Hc of-fers the highest potential for carbon emission reduction,capable of reducing emissions by 96.04 kg/t when replacing 40wt%coal injec-tion.

关键词： blast furnace injection biomass cross-upgrading hydrothermal carbonization pyrolysis physicochemical properties gasific-ation properties