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Progress and challenge of functional single-atom catalysts for the catalytic oxidation of volatile organic compounds

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Chinese Chemical Letters 2024年第9期35卷 83-91页

作者： Zeyu Jiang Yadi Wang Changwei Chen Chi He Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China National Engineering Laboratory for VOCs Pollution Control Material&Technology University of Chinese Academy of SciencesBeijing 101408China

The catalytic oxidation of volatile organic compounds(VOCs)is of considerable significance for the sustainable development of the chemical industry;thus,considerable efforts have been devoted to the exploration of efficient catalysts for use in this *** this regard,the development and utilization of single-atom catalysts(SACs)in VOCs decomposition is a rapidly expanding research *** can be employed as potential catalysts for oxidizing VOC molecules due to their optimal utilization efficiency,unique atomic bonding structures,and unsaturated *** has been achieved,while the challenges surrounding precise regulation of the microstructures of SACs for improving their low-temperature efficiency,stability,and product selectivity under practical conditions are ***,elucidating structure-performance relationships and establishing intrinsic modulating mechanisms are urgently required for guiding researchers on how to synthesize effective and stable functional SACs ***,recent advances in the design and synthesis of functional SACs for application in the catalytic oxidation of VOCs are *** experimental and theoretical studies revealing higher efficiency,stability,and selectivity of as-prepared functional SACs are being ***,the future perspectives in terms of promising catalysts with multi-sized composite active sites and the illustration of intrinsic mechanism are *** rapid intelligent screening of applicable SACs and their industrial applications are also discussed.

关键词： Single-atom catalysts VOCs catalytic oxidation Hydrocarbon activation Oxygen species transformation Surface chemistry Intrinsic mechanism

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Ultrathin RCS Reduction Metasurface Based on Integer and Fractional Vortex Waves

Ultrathin RCS Reduction Metasurface Based on Integer and Fra...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Liu, Qian Liang, Difei Chen, Haiyan Han, Tiancheng Yao, Xin He, Qingting Wang, Xiaodi Wen, Shuntian Xue, Zhichao University of Electronic Science and Technology of China National Engineering Research Center of Electromagnetic Radiation Control Materials Chengdu China University of Electronic Science and Technology of China Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education Chengdu China

ISBN: (纸本)9798350375909

In this paper, an ultrathin radar cross section (RCS) reduction metasurface is designed and realized by reflection-type vortex waves with various topological charges. Due to the singularity of the OAM characteristics, a significant RCS reduction is obtained at the operating frequency of 14GHz. Based on the fact that fractional-order vortex waves have unique radial amplitude zeros in addition to amplitude zero in the center, the monostatic RCS reduction characterization of fractional-order vortex metasurface is also mainly discussed. By analyzing the orbital angular momentum spectrum of different fractional vortex waves and field variation, the singularity range can be effectively manipulated so that the singularity is transmitted in the radial direction. The simulated results demonstrate that different OAM modes can be generated, and the monostatic RCS reduction over 30dB can be obtained at 14GHz under the normal incidence of the plane wave. Moreover, the thickness of the proposed RCS reduction metasurface is about 0.05 wavelength of the operation resonant frequency, which indicates that the metasurfaces have the characteristic of ultrathin. The far-field features of these metasurfaces show that they have prospective application value in scattering control technology. © 2024 IEEE.

关键词： Radar cross section

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Boosting C_(2)H_(6)/C_(2)H_(4) separation via the precise electrostatic modulation of synthetic 1D channel at atomic level

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Nano Research 2024年第11期17卷 10083-10087页

作者： Salamanti Ainiwaner Hengcong Huang Jia-Jia Zheng Fengting Li Xue-Tong Yang Yang-Yang Guo Fangli Yuan Ming-Shui Yao Yifan Gu College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Laboratory of Theoretical and Computational Nanoscience National Center for Nanoscience and Technology Chinese Academy of Sciences Beijing 100190 China Skate Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing 100049 China

The regulation of gas sorption via simple pore modification is crucial to molecular recognition and chemical ***,a rational pore surface electrostatic modulation in synthetic one dimensioned(1-D)channel is demonstrated to boost ethane/ethylene(C_(2)H_(6)/C_(2)H_(4))selectivity for one-step extraction of C_(2)H_(4) from C_(2)H_(6)/C_(2)H_(4) *** the precise modulation of the surface charge arrangement with negatively charged moieties in the 1-D channel of a metal—organic framework(MOF),enhanced C_(2)H_(6)—host framework and decreased C_(2)H_(4)—host framework electrostatic interactions were obtained,which resulted in an obvious improvement in adsorption ***,the breakthrough separation performance rendered the obtained MOF an efficient adsorbent for C_(2)H_(4) purification from C_(2)H_(6)/C_(2)H_(4) *** combined detail theoretical studies prove that the gas sorption selectivity is remarkably sensitive to framework electrostatic change even in the case of pore surface modification at the atomic *** results are of fundamental importance to the design of porous materials for challenging separation tasks.

关键词： metal—organic framework ethane/ethylene separation ethane—selective MOF adsorption electrostatic modulation

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A review from fundamental research to device applications for graphene-based thermal rectifier

DeCarbon

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DeCarbon 2024年第2期4卷 1-35页

作者： Hengbin Ding Jiarui He Liming Ding He Tian School of Integrated Circuits Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084China CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing 100190 China

Thermal rectification(TR)is a phenomenon akin to electrical *** has a high thermal conductivity(k)in one direction,enabling efficient heat dissipation,as well as a low k in the opposite direction,impeding heat *** the rapid development of nanotechnology in recent years,the active control and regulation of heat conduction on the nanoscale has become a critical ***,a prominent two-dimensional(2D)material,is highly regarded for its exceptional thermal transport *** have been studies and achievements both theoretically and experimentally since its *** this review,we establish a bridge between fundamental research and application studies for graphene-based thermal rectifier as ***,we summarize the established 2D heat conduction theories and low-dimensional simulation ***,we review the progress of experimental techniques and device structures based on 2D theories for graphene-based thermal ***,we discuss several applications of thermal rectifier,including thermal logic circuits and thermoelectric power generation ***,we present the potential applications of graphene-based thermal rectifiers previously unexplored,such as microelectronic thermal management and thermal decoupling for flexible *** hope that advancements in morphology and fabrication techniques will lead to widespread use of graphene-based thermal rectifiers in various thermal systems to solve diverse thermal management problems in the near future.

关键词： Graphene Thermal rectification Fundamental research Application studies

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A Semantic Interpretation Method for Deep Neural Networks Based on Knowledge Graphs

A Semantic Interpretation Method for Deep Neural Networks Ba...

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2022 Chinese Automation Congress, CAC 2022

作者： Liu, Jingjing Xu, Song Wang, Lina Beijing Aerospace Control Institute National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing China

ISBN: (纸本)9781665465335

Despite the great success of deep neural networks in many fields, the lack of interpretability has severely limited their wide application in security-sensitive tasks. Although current interpretable methods of deep neural networks such as visualization, class activation mapping, and sensitivity analysis can help users intuitively understand the inner working mechanism of the neural networks to some extent, they are either too coarse in explanation or too complex in explanation form to read easily. In order to use semantic information which is more understandable and close to human thought to interpret the deep neural network and increase the readability of the interpretation,we propose a semantic interpretation method of deep neural network based on knowledge graph. The method takes the VGG16 network as an example, and by mining the key neuronsof the neural network, construct semantic dictionaries and knowledge maps of key neurons, and automatically generate human-understandable semantic explanatory statements based on the knowledge maps. The method provides a new idea to improve the transparency of the operation process of deep neural networks, and also provides a clearer reference basis for pruning and tuning of deep neural networks. © 2022 IEEE.

关键词： Deep neural networks

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Fe-Ni-F electrocatalyst for enhancing reaction kinetics of water oxidation

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Chinese Journal of Structural Chemistry 2024年第2期43卷 60-65页

作者： Yi Zhang Biao Wang Chao Hu Muhammad Humayun Yaping Huang Yulin Cao Mosaad Negem Yigang Ding Chundong Wang School of Chemical Engineering and Pharmacy Key Laboratory of Green Chemical Process of Ministry of EducationKey Laboratory of Novel Reactor and Green Chemical Technology of Hubei ProvinceWuhan Institute of TechnologyWuhan430073PR China Energy Waterand Environment LabCollege of Humanities and SciencesPrince Sultan UniversityRiyadh11586Saudi Arabia School of Integrated Circuits Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan430074PR China Physics Laboratory Industrial Training CenterShenzhen Polytechnic UniversityShenzhen518055PR China Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt

Highly active and low-cost oxygen evolution reaction(OER)catalytic electrodes are extremely essential for exploration of green hydrogen via water ***,an advanced Fe-Ni-F electrocatalyst is fabricated by a facile annealing strategy using ammonium fluoride,of which the structure feature is unveiled by XRD,FESEM,TEM,EDS,BET,and XPS *** as-prepared Fe-Ni-F addresses a low overpotential of 277 mV and a small Tafel slope of 49 mV dec^(-1)at a current density of 10 mA cm^(-2),significantly outperforming other control samples as well as the state-of-the-art RuO_(2).The advanced nature of our Fe-Ni-F catalyst could also be further evidenced from the robust stability in KOH alkaline solution,showing as 5.41%degradation after 24 h continuous *** analysis,it suggests that the decent catalytic activity should be attributed to the formed bimetallic(oxy)hydroxides because of the introduction of fluoride and the synergistic effect of iron and nickel towards oxygen *** work represents the potential of Fe-and/or Ni-based fluoride as efficient catalyst for low-energy consumption oxygen generation.

关键词： Fluoride Oxygen evolution reaction Fe-Ni-F Reaction kinetics

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Recent progress of radionuclides separation by porous materials

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science China Chemistry 2024年第11期67卷 3515-3577页

作者： Yinghui Xie Long Yu Long Chen Cheng Chen Li Wang Fenglei Liu Yun Liao Peng Zhang Tao Chen Yihui Yuan Yuexiang Lu Boyang Huang Hui Yang Suhua Wang Shuao Wang Lijian Ma Feng Luo Yunhai Liu Baowei Hu Hongqing Wang Duoqiang Pan Wenkun Zhu Ning Wang Zhe Wang Liang Mao Shengqian Ma Xiangke Wang Guangdong Provincial Key Laboratory for Green Agricultural Production and Intelligent Equipment School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyMaoming 525000China School of Life Science Shaoxing UniversityShaoxing 312000China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China College of Chemistry Sichuan UniversityChengdu 610064China School of Chemistry and Materials Science East China University of TechnologyNanchang 330013China School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China State Key Laboratory of Environment-friendly Energy Materials National Co-innovation Center for Nuclear Waste Disposal and Environmental SafetySichuan Civil-military Integration InstituteSchool of National Defence&Nuclear Science and TechnologySouthwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Marine Resource Utilization in South China Sea Collaborative Innovation Center of Marine Science and TechnologyHainan UniversityHaikou 570228China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210093China Department of Chemistry University of North TexasDentonTX 76201USA

The separation of radionuclides is critical for the sustainable development of nuclear energy. It is urgent to design and prepare functionalized materials for efficient radionuclides separation. Porous materials are considered excellent candidates for the separation of radionuclides under complex conditions due to their high specific surface areas, tunable pore structures and controllable functionalities. In this review, we summarized the design, preparation and functionalization of porous materials and their application for separation of radionuclides in the past five years, discussed the separation performance and analyzed the structure-activity relationship between various radionuclides and porous materials, and systematically clarified their characterization and mechanism of different type porous materials. We also introduced the detection, irradiation and chemical toxicity of different reflective radionuclides.

关键词： porous materials radionuclides detection separation radiotoxicity interaction mechanism

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Microcavity assisted graphene pressure sensor for single-vessel local blood pressure monitoring

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Nano Research 2024年第11期17卷 10058-10068页

作者： Jinan Luo Jingzhi Wu Xiaopeng Zheng Haoran Xiong Lin Lin Chang Liu Haidong Liu Hao Tang Houfang Liu Fei Han Zhiyuan Liu Zhikang Deng Chuting Liu Tianrui Cui Bo Li Tian-Ling Ren Jianhua Zhou Yancong Qiao School of Biomedical Engineering Shenzhen Campus of Sun Yat-sen University Shenzhen 518107 China Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province School of Biomedical Engineering Sun Yat-sen University Guangzhou 510275 China School of Integrated Circuits and Beijing National Research Center for Information Science and Technology (BNRist) Tsinghua University Beijing 100084 China CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences (CAS) Shenzhen 518055 China Cardiovascular surgery Seventh affiliated Hospital of Sun Yat-sen University Shenzhen 518107 China

Dynamic monitoring of blood pressure (BP) is beneficial to obtain comprehensive cardiovascular information of patients throughout the day. However, the clinical BP measurement method relies on wearing a bulky cuff, which limits the long-term monitoring and control of BP. In this work, a microcavity assisted graphene pressure sensor (MAGPS) for single-vessel local BP monitoring is designed to replace the cuff. The microcavity structure increases the working range of the sensor by gas pressure buffering. Therefore, the MAGPS achieves a wide linear response of 0–1050 kPa and sensitivity of 15.4 kPa^(−1). The large working range and the microcavity structure enable the sensor to fully meet the requirements of BP detection at the radial artery. A database of 228 BP data (60-s data fragment detected by MAGPS) and 11,804 pulse waves from 9 healthy subjects and 5 hypertensive subjects is built. Finally, the BP was detected and analyzed automatically by combining MAGPS and a two-stage convolutional neural network algorithm. For the BP detection method at local radial artery, the first stage algorithm first determines whether the subject has hypertension by the pulse wave. Then, the second stage algorithm can diagnose systolic and diastolic BP with the accuracy of 93.5% and 97.8% within a 10 mmHg error, respectively. This work demonstrates a new BP detection method based on single vessel, which greatly promotes the efficiency of BP detection.

关键词： graphene pressure sensor microcavity assisted pressure sensor single-vessel BP monitoring two-stage neural network algorithm

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In-situ synthesis,microstructure,and properties of NbB_(2)-NbC-Al_(2)O_(3)composite coatings by plasma spraying

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Journal of Advanced Ceramics 2022年第8期11卷 1263-1278页

作者： Xiaolong WANG Yong YANG Shitong JIA Yanwei WANG Yuduo MA Yuhang CUI Xingyu WANG Wenwei SUN Liang WANG Key Lab.for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentTianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300401China Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

The high melting point and strong chemical bonding of NbB_(2)pose a great challenge to the preparation of high-density nanostructured NbB_(2)composite ***,we report a novel,simple,and efficient method to fabricate in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating by plasma spraying Nb_(2)O_(5)–B_(4)C–Al composite powder,aiming at realizing the higher densification and ultra-fine microstructure of NbB_(2)composite *** microstructure and properties of in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating were studied comparatively with ex-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating(plasma spraying NbB_(2)–NbC–Al_(2)O_(3)composite powder).The reaction mechanism of Nb_(2)O_(5)–B_(4)C–Al composite powder in plasma jet was analyzed in *** results showed that the in-situ nanostructured NbB_(2)–NbC–Al_(2)O_(3)composite coating presented a lower porosity and superior performance including higher microhardness,toughness and wear resistance compared to the plasma sprayed ex-situ NbB_(2)–NbC–Al_(2)O_(3)coating and other boride composite *** of the in-situ NbB_(2)–NbC–Al_(2)O_(3)coating was attributed to the low melting point of Nb_(2)O_(5)–B_(4)C–Al composite powder and the exothermic effect of in-situ *** superior performance was ascribed to the density improvement and the strengthening and toughening effect of the nanosized *** in-situ reaction path could be expressed as:Nb_(2)O_(5)+Al®Nb+Al_(2)O_(3),and Nb+B_(4)C®NbB_(2)+NbC.

关键词： NbB_(2)-NbC-Al_(2)O_(3)composite coating plasma spray in-situ synthesis Nb_(2)O_(5)-B_(4)C-Al system

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A RESEARCH OF THE DISCRETE DIGITAL BRAKE VALVE MATCHING DESIGN AND control FOR LARGE AIRCRAFT

A RESEARCH OF THE DISCRETE DIGITAL BRAKE VALVE MATCHING DESI...

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2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Wang, Yi Wu, Shuai Jin, Hongtao Li, Chuandong Gao, Xiaolong Jiao, Zongxia School of Automation Science and Electrical Engineering Beihang University Beijing100191 China National Key Laboratory of Aircraft Integrated Flight Control Beihang University Beijing100191 China Ministry of Industry and Information Technology Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315800 China Tianmushan Laboratory Hangzhou310023 China

The aircraft braking system is a vital component of the aircraft, responsible for dissipating the kinetic energy of the aircraft and slowing it down to stop. In the field of aircraft braking systems, hydraulic systems with high power-to-weight ratios are currently the preferred choice. The brake control valve is a crucial component of the braking system, regulating the pressure of the essential components. The use of a discrete digital valve, designed to be pollution-resistant and fault-tolerant, can significantly enhance the performance of the braking system. The majority of existing designs and selections for discrete digital valves are based on experience, which may result in the unnecessary increase in system redundancy, volume and weight. This paper analyses the requirements of an aircraft braking system, combining the load situation and actual working conditions to determine the matching design of discrete digital valves. The efficacy of the designed brake valve in terms of performance and braking effectiveness is validated through the construction of a discrete digital valve braking system model. © The Institution of Engineering & technology 2024.

关键词： Aircraft hydraulic systems

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