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Metal-Free 2D/2D van der Waals Heterojunction Based on Covalent Organic Frameworks for Highly Efficient Solar Energy Catalysis

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Nano-Micro Letters 2023年第9期15卷 15-30页

作者： Ge Yan Xiaodong Sun Yu Zhang Hui Li Hongwei Huang Baohua Jia Dawei Su Tianyi Ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Adv.Mater.College of ChemistryLiaoning UniversityShenyang 110036People’s Republic of China School of Science RMIT UniversityMelbourneVIC 3000Australia Faculty of Science School of Mathematical and Physical SciencesUniversity of Technology SydneySydneyNSW 2007Australia Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083People’s Republic of China

Covalent organic frameworks(COFs)have emerged as a kind of rising star materials in ***,their photocatalytic activities are restricted by the high photogenerated electron-hole pairs recombination ***,a novel metal-free 2D/2D van der Waals heterojunction,composed of a two-dimensional(2D)COF with ketoenamine linkage(TpPa-1-COF)and 2D defective hexagonal boron nitride(h-BN),is successfully constructed through in situ solvothermal *** from the presence of VDW heterojunction,larger contact area and intimate electronic coupling can be formed between the interface of TpPa-1-COF and defective h-BN,which make contributions to promoting charge car-riers *** introduced defects can also endow the h-BN with porous structure,thus providing more reactive ***,the TpPa-1-COF will undergo a structural transformation after being integrated with defective h-BN,which can enlarge the gap between the conduction band position of the h-BN and TpPa-1-COF,and suppress electron backflow,corroborated by experimental and density functional theory calculations ***,the resulting porous h-BN/TpPa-1-COF metal-free VDW heterojunction displays out-standing solar energy catalytic activity for water splitting without co-catalysts,and the H_(2) evolution rate can reach up to 3.15 mmol g^(−1) h^(−1),which is about 67 times greater than that of pristine TpPa-1-COF,also surpassing that of state-of-the-art metal-free-based photocatalysts reported to *** particular,it is the first work for constructing COFs-based heterojunctions with the help of h-BN,which may provide new avenue for designing highly efficient metal-free-based photocatalysts for H_(2) evolution.

关键词： Covalent organic frameworks 2D/2D van der Waals heterojunction Metal-free photocatalyst

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Integrated optical parametric amplifiers in silicon nitride waveguides incorporated with 2D graphene oxide films

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Light(Advanced Manufacturing) 2023年第4期4卷 100-116页

作者： Yang Qu Jiayang Wu Yuning Zhang Yunyi Yang Linnan Jia Houssein El Dirani Sébastien Kerdiles Corrado Sciancalepore Pierre Demongodin Christian Grillet Christelle Monat Baohua Jia David J.Moss Optical Sciences Centre Swinburne University of TechnologyHawthornVIC 3122Australia UniversitéGrenoble-Alpes CEA-LETI17 Avenue des Martyrs38054 GrenobleFrance Universitéde Lyon Ecole Centrale de LyonINSA LyonUniversitéClaude Bernard Lyon 1CPE LyonCNRSINLUMR527069130 EcullyFrance Centre for Atomaterials and Nanomanufacturing School of ScienceRMIT UniversityMelbourneVIC 3000Australia Australian Research Council(ARC)Industrial Transformation Training Centre in Surface Engineering for Advanced Materials(SEAM)RMIT UniversityMelbourneVictoria 3000Australia H.El Dirani is currtently at LIGENTEC SA 224 Bd John Kennedy91100 Corbeil-EssonnesFrance C.Sciancalepore is currently at Soitec SA 38190 BerninFrance

Optical parametric amplification(OPA)represents a powerful solution to achieve broadband amplification in wavelength ranges beyond the scope of conventional gain media,for generating high-power optical pulses,optical microcombs,entangled photon pairs and a wide range of other ***,we demonstrate optical parametric amplifiers based on silicon nitride(Si3N4)waveguides integrated with two-dimensional(2D)layered graphene oxide(GO)*** achieve precise control over the thickness,length,and position of the GO films using a transfer-free,layer-by-layer coating method combined with accurate window opening in the chip cladding using *** OPA measurements with a pulsed pump for the fabricated devices with different GO film thicknesses and lengths show a maximum parametric gain of~24.0 dB,representing a~12.2 dB improvement relative to the device without *** perform a theoretical analysis of the device performance,achieving good agreement with experiment and showing that there is substantial room for further *** work represents the first demonstration of integrating 2D materials on chips to enhance the OPA performance,providing a new way of achieving high performance photonic integrated OPA by incorporating 2D materials.

关键词： Integrated photonics Nonlinear optics Optical parametric process 2D materials

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Enhancing Green Ammonia Electrosynthesis Through Tuning Sn Vacancies in Sn‑Based MXene/ MAX Hybrids

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Nano-Micro Letters 2024年第5期16卷 154-168页

作者： Xinyu Dai Zhen‑Yi Du Ying Sun Ping Chen Xiaoguang Duan Junjun Zhang Hui Li Yang Fu Baohua Jia Lei Zhang Wenhui Fang Jieshan Qiu Tianyi Ma Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning Province College of ChemistryInstitute of Clean Energy ChemistryLiaoning UniversityShenyang 110036People’s Republic of China State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601People’s Republic of China School of Chemical Engineering The University of AdelaideAdelaideSA 5005Australia State Key Laboratory of High‑Efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021NingxiaPeople’s Republic of China School of Science RMIT UniversityMelbourneVIC 3000Australia Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640People’s Republic of China College of Chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Renewable energy driven N_(2) electroreduction with air as nitrogen source holds great promise for realizing scalable green ammonia ***,relevant out-lab research is still in its ***,a novel Sn-based MXene/MAX hybrid with abundant Sn vacancies,Sn@Ti_(2)CTX/Ti_(2)SnC–V,was synthesized by controlled etching Sn@Ti_(2)SnC MAX phase and demonstrated as an efficient electrocatalyst for electrocatalytic N2 *** to the synergistic effect of MXene/MAX heterostructure,the existence of Sn vacancies and the highly dispersed Sn active sites,the obtained Sn@Ti2CTX/Ti_(2)SnC–V exhibits an optimal NH_(3) yield of 28.4μg h^(−1) mg_(cat)^(−1) with an excellent FE of 15.57% at−0.4 V versus reversible hydrogen electrode in 0.1 M Na_(2)SO_(4),as well as an ultra-long ***,this catalyst represents a satisfactory NH3 yield rate of 10.53μg h^(−1) mg^(−1) in the home-made simulation device,where commercial electrochemical photovoltaic cell was employed as power source,air and ultrapure water as feed *** as-proposed strategy represents great potential toward ammonia production in terms of financial cost according to the systematic technical economic *** work is of significance for large-scale green ammonia production.

关键词： Green ammonia synthesis N2 electroreduction Renewable energy Sn MXene/MAX hybrid

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MOF‐derived 1D/3D N‐doped porous carbon for spatially confined electrochemical CO_(2) reduction to adjustable syngas

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Carbon Energy 2024年第8期6卷 1-13页

作者： Wei Zhang Hui Li Daming Feng Chenglin Wu Chenghua Sun Baohua Jia Xue Liu Tianyi Ma Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials Institute of Clean Energy ChemistryCollege of ChemistryLiaoning UniversityShenyangLiaoningChina School of Science RMIT UniversityMelbourneVictoriaAustralia School of Pharmaceutical and Chemical Engineering Taizhou UniversityTaizhouZhejiangChina Department of Chemistry and Biotechnology Swinburne University of TechnologyHawthornVictoriaAustralia

Electrochemical reduction of CO_(2) to syngas(CO and H_(2))offers an efficient way to mitigate carbon emissions and store intermittent renewable energy in ***,the hierarchical one‐dimensional/three‐dimensional nitrogen‐doped porous carbon(1D/3D NPC)is prepared by carbonizing the composite of Zn‐MOF‐74 crystals in situ grown on a commercial melamine sponge(MS),for electrochemical CO_(2) reduction reaction(CO_(2)RR).The 1D/3D NPC exhibits a high CO/H_(2) ratio(5.06)and CO yield(31 mmol g^(−1)h^(−1))at−0.55 V,which are 13.7 times and 21.4 times those of 1D porous carbon(derived from Zn‐MOF‐74)and N‐doped carbon(carbonized by MS),*** is attributed to the unique spatial environment of 1D/3D NPC,which increases the adsorption capacity of CO_(2) and promotes electron transfer from the 3D N‐doped carbon framework to 1D carbon,improving the reaction kinetics of CO_(2)*** results and charge density difference plots indicate that the active site of CO_(2)RR is the positively charged carbon atom adjacent to graphitic N on 1D carbon and the active site of HER is the pyridinic N on 1D *** presence of pyridinic N and pyrrolic N reduces the number of electron transfer,decreasing the reaction kinetics and the activity of CO_(2)*** CO/H_(2) ratio is related to the distribution of N species and the specific surface area,which are determined by the degree of spatial confinement *** CO/H_(2) ratios can be regulated by adjusting the carbonization temperature to adjust the degree of spatial confinement *** the low cost of feedstock and easy strategy,1D/3D NPC catalysts have great potential for industrial application.

关键词： electrochemical CO_(2)reduction reaction melamine sponge metal‐organic frameworks porous carbon syngas

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传声器风噪声和防风罩降噪性能仿真研究

传声器风噪声和防风罩降噪性能仿真研究

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2016年全国声学学术会议

作者：郭琴邱小军南京大学声学研究所教育部近代声学重点实验室悉尼科技大学音频声学振动研究中心工程与信息技术学部

以计算流体力学与计算气动声学理论为基础,对传声器风噪声和防风罩的降噪性能进行预测。通过划分高精度的双圆柱模型网格,采用大涡模拟法,建立了传声器湍流噪声的预测方法。应用该方法分别仿真风速5 m/s、10 m/s和20 m/s时的风噪声,并探... 详细信息

以计算流体力学与计算气动声学理论为基础,对传声器风噪声和防风罩的降噪性能进行预测。通过划分高精度的双圆柱模型网格,采用大涡模拟法,建立了传声器湍流噪声的预测方法。应用该方法分别仿真风速5 m/s、10 m/s和20 m/s时的风噪声,并探讨60 mm、90 mm和175 mm三种直径的球形防风罩的降噪作用,根据仿真结果分析防风罩尺寸、孔径等参数对降噪性能的影响。结果表明:随着风速增大,风噪声随之升高;防风罩的引入可以有效降低风噪声,175 mm防风罩表现出更好的降噪效果;对于20 Hz的低频,大孔径的防风罩的降噪性能更好。

关键词：气动声学风噪声防风罩

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Ultrafine red phosphorus confined in reasonably designed pitch-based carbon matrix built of well-interconnected carbon nanosheets for high-performance lithium and potassium storage

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Resources Chemicals and Materials 2024年第1期3卷 54-61页

作者： Chang Liu Junjun Yao Ying Sun Yaming Zhu Hongmei Li Daming Feng Hui Li Yunlei Yang Quanxing Mao Tianyi Ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning ProvinceCollege of ChemistryLiaoning UniversityShenyang 110036China School of Science RMIT UniversityMelbourneVIC 3000Australia Institute of Chemical Engineering University of Science and TechnologyLiaoningAnshan 114051China College of Materials Science and Engineering Shenyang Aerospace UniversityShenyang 110136China

Red phosphorus has been well-recognized as promising anode materials for lithium-ion batteries(LIBs)and potassium-ion batteries(PIBs)due to its extremely high theoretical capacity and low ***,the huge volume change and poor electric conductivity severely limit its further practical ***,the nanoscale ultrafine red phosphorus has been successfully confined in a three-dimensional pitch-based porous carbon skeleton composed of well-interconnected carbon nanosheets through the vaporization-condensation *** for the traditional requirement of high electric conductivity and stable mechanical stability,the micropores and small mesopores in the porous carbon matrix centered at 1 to 3 nm and the abundant amount of oxygen-containing functional groups are also beneficial for the high loading and dispersion of red *** anode for LIBs,the composite exhibits high reversible discharge capacities of 968 mAh g^(-1),excellent rate capabilities of 593 mAh g^(-1)at 2 A g^(-1),and long cycle performance of 557 mAh g^(-1)at 2 A g^(-1).More impressively,as the anode for PIBs,the composite presents a high reversible capacity of 661 mAh g^(-1)and a stable capacity of 312 mAh g^(-1)at 0.5 A g^(-1)for 500 cycles with a capacity retention up to 84.3%.This work not only sheds light on the structure design of carbon hosts with specific pore structure but also open an avenue for high value-added utilization of coal tar pitch.

关键词： Carbon anodes Coal tar pitch Lithium-ion batteries Potassium-ion batteries Red phosphorus

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Nanoengineering Metal–Organic Frameworks and Derivatives for Electrosynthesis of Ammonia

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Nano-Micro Letters 2023年第11期15卷 205-240页

作者： Daming Feng Lixue Zhou Timothy J.White Anthony K.Cheetham Tianyi Ma Fengxia Wei College of Chemistry Liaoning UniversityShenyang 110036People’s Republic of China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Materials Research Laboratory University of CaliforniaSanta BarbaraCA 93106USA School of Science RMIT UniversityMelbourneVIC 3000Australia Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A^(*)STAR)2 Fusionopolis WayInnovis 08‑03Singapore 138634Singapore

Electrocatalytic synthesis under mild conditions has become increasingly important as one of the practical alternatives for industrial applications,especially for the green ammonia(NH_(3))industry.A properly engineered electrocatalyst plays a vital role in the realization of superior catalytic *** various types of promising nanomaterials,metal–organic frameworks(MOFs)are competitive candidates for developing efficient electrocatalytic NH_(3) synthesis from simple nitrogen-containing molecules or ions,such as N_(2) and NO_(3)^(−).In this review,recent advances in the development of electrocatalysts derived from MOFs for the electrosynthesis of NH_(3) are collected,categorized,and discussed,including their application in the N_(2) reduction reaction(NRR)and the NO_(3)^(−)reduction reaction(NO3RR).Firstly,the fundamental principles are illustrated,such as plausible mechanisms of NH_(3) generation from N_(2) and NO_(3)^(−),the apparatus of corresponding electrocatalysis,parameters for evaluation of reaction efficiency,and detection methods of yielding NH_(3).Then,the electrocatalysts for NRR processes are discussed in detail,including pristine MOFs,MOF-hybrids,MOF-derived N-doped porous carbons,single atomic catalysts from pyrolysis of MOFs,and other MOF-related ***,MOF-related NO3RR processes are also listed and ***,the existing challenges and prospects for the rational design and fabrication of electrocatalysts from MOFs for electrochemical NH_(3) synthesis are presented,such as the evolution of investigation methods with artificial intelligence,innovation in synthetic methods of MOF-related catalysts,advancement of characterization techniques,and extended electrocatalytic reactions.

关键词： Metal–organic frameworks Electrosynthesis of ammonia Nitrogen reduction reactions Nitrate reduction reactions

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