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Comparison of the effect of hydrogen incorporation and oxygen vacancies on the properties of anatase TiO_2:electronics,optical absorption,and interaction with water

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Chinese Science Bulletin 2014年第18期59卷 2175-2180页

作者： Hui Jin Lianzhou Wang Debra J.Searles Chenghua Sun australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQld 4072Australia ARC centre of Excellence for Functional Nanomaterials School of Chemical EngineeringThe University of QueenslandBrisbaneQld 4072Australia school of Chemistry and Molecular Biosciences The University of QueenslandBrisbaneQld 4072Australia school of Chemistry Monash UniversityMelbourneVIC 3800Australia

Hydrogenation has been recently developed as an approach to improve the visible-light response of titanium dioxide(TiO2);however,the effect of hydrogenation on the electronics and optical absorption of anatase TiO2has been widely *** this work,the electronic structures and optical properties of hydrogenated TiO2and its interaction with water have been studied using the density functional theory plus Hubbard model.A comparison of the effect of hydrogenation and introduction of oxygen vacancies(OVs)to TiO2is *** is found that both hydrogenation and OVs can promote the absorption of visible light and strengthen the adsorption of *** with OVs,hydrogen incorporation can lead to local distortion and even amorphous structures when it is heavily doped.

关键词：二氧化钛电子结构锐钛矿型相互作用光吸收氧空位 Hubbard模型可见光响应

Mesoporous MnO_(2)nanosheets for efficient electrocatalytic nitrogen reduction via high spin polarization induced by oxygen vacancy

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Nano Research 2023年第4期16卷 4664-4670页

作者： Yangyang Wen Jiahao Liu Feiran Zhang Zhenxing Li Ping Wang Zhao Fang Miao He Jingshuai Chen Weiyu Song Rui Si Lianzhou Wang State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing 102249China College of Science China University of Petroleum(Beijing)Beijing 102249China school of Chemistry and chemical engineering Anhui UniversityHefei 230601China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Nanomaterials centre School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbaneQLD 4072Australia

The electrochemical N_(2)reduction reaction(NRR)represents a green and sustainable route for NH_(3)synthesis under ambient ***,the mechanism of N_(2)activation in the electrocatalytic NRR remains ***,we found that the high spin state Mn^(3+)-Mn^(3+)pairs induced by oxygen vacancy in MnO_(2)nanosheets greatly enhance the catalytic *** strong electron transfer between d orbital of Mn and orbital of N2 forces the N_(2)to be of radical nature,which activates the hydrogenation process and weakens the N≡N *** on the density functional theory(DFT)calculation results,we precisely designed mesoporous MnO_(2)nanosheets with rich oxygen vacancies via using methyltriphenylphosphonium bromide(MPB)to induce more Mn^(3+)-Mn^(3+)pairs(Mn^(3-3)-MnO_(2)),which can achieve a fairly high ammonia yield of up to 147.2μg·h^(−1)·mgcat−***−0.75 V *** hydrogen electrode(RHE)and a high Faradaic efficiency(FE)of 11%.Furthermore,these mesoporous MnO_(2)nanosheets exhibit the superior durability with negligible changes in both NH3 yield and FE after a consecutive 6-recycle test and the current density electrolyzed over a 24-hour *** findings offer an approach to designing highly active transition metal catalysts for electrocatalytic nitrogen reduction.

关键词： Mn^(3+)-Mn^(3+)pair MnO_(2)nanosheets mesopores ammonia synthesis electrocatalytic nitrogen reduction

Breakage and separation mechanism of ZGM coal mill based on parameters optimization model

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International Journal of Mining Science and Technology 2014年第2期24卷 285-289页

作者： Wei Hua He Yaqun Shi Fengnian Zhou Nianxing Wang Shuai Ge Linhan school of chemical engineering and Technology China University of Mining & Technology University of Queensland Sustainable Minerals InstituteJulius Kruttschnitt Mineral Research Centre

Sampling ports were firstly drilled on a ZGM95 coal mill in the power plant in China, and the coal samples from various points in the pulverizer were collected under the different operation conditions. The prop- erty of the sampling material from the mill was analyzed, applying the float-sink test, size distribution analysis, proximate analysis and so on. It was indicated that the ＋250 I^m fraction in the pulverized fuel accounted for only 0.02%, while it was 83.2% in the new feed. The circulating ratio and coal flow in the separator and the cone zone were calculated using the mass balance of the circulating load. So, the cir- culating ratio in the separator of the pulverizer was between 8 and 13, and the circulating ratio, the feed flow of separator and cone zone all raised with the increase of the air volume. Furthermore, the parameters of the separation functions were obtained based on the fitting method. It was shown that the mean value of the shape factor B was 0.7617, and the parameter D which is the particle size at 50% cumulative yield in the separator almost kept unchanged.

关键词： ZGM mill Coal grinding Parameters optimization Mass balance

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Journal of Green Building 2009年第2期4卷 109-125页

作者： Katherine Gregory Behdad Moghtaderi Adrian Page Priority Research centre for Energy Chemical EngineeringSchool of EngineeringFaculty of Engineering&Built EnvironmentThe University of NewcastleCallaghanNSW 2308Australia

This paper summarises the results of a combined numerical,statistical and experimental study concerned with the use of dissimilar walling systems on the external parts of a given building *** rational behind this“hybrid wall”concept,as opposed to conventional approaches where identical walls are used in a building envelope,is to achieve a more effective distribution of thermal mass across the envelope and,hence,improve the overall thermal per-formance of the *** effectiveness of the“hybrid wall”concept was investigated using a series of hypothetical building modules of common australian residential constructions,namely Light Weight(LW),Brick Veneer(BV),Reverse Brick Veneer(RBV)and Cavity Brick(CB).These designs were examined numerically using a commercial energy rating tool known as“AccuRate”,statistically using JMP software and experimentally using a novel bench-scale setup developed as part of this *** performance of each design was evaluated by its energy *** numerical predictions and experimental data highlighted that the east and west walls have the most impact on the energy consumption under australian climatic *** was found that considerable reductions in the energy consumption could be achieved in cases where the hybrid wall concept was implemented through the use of high ther-mal mass insulated walls on the east and west sides of the building envelope.

关键词： thermal mass hybrid walling systems energy efﬁciency sustainable building

Enhanced High-Temperature Cycling Stability of Garnet-Based All Solid-State Lithium Battery Using a Multi-Functional Catholyte Buffer Layer

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Nano-Micro Letters 2024年第7期16卷 59-73页

作者： Leqi Zhao Yijun Zhong Chencheng Cao Tony Tang Zongping Shao WA school of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerthWA 6102Australia

The pursuit of safer and high-performance lithium-ion batteries(LIBs)has triggered extensive research activities on solid-state batteries,while challenges related to the unstable electrode-electrolyte interface hinder their practical *** has been used extensively to improve the cathode-electrolyte interface in garnet-based all-solid-state LIBs(ASSLBs),while it introduces new concerns about thermal *** this study,we propose the incorporation of a multi-functional flame-retardant triphenyl phos-phate additive into poly(ethylene oxide),acting as a thin buffer layer between LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)cathode and garnet *** electrochemical stability tests,cycling performance evaluations,interfacial thermal stability analysis and flammability tests,improved thermal stability(capacity retention of 98.5%after 100 cycles at 60℃,and 89.6%after 50 cycles at 80℃)and safety characteristics(safe and stable cycling up to 100℃)are *** on various materials characterizations,the mechanism for the improved thermal stability of the interface is *** results highlight the potential of multi-functional flame-retardant additives to address the challenges associated with the electrode-electrolyte interface in ASSLBs at high *** thermal modification in ASSLBs operating at elevated temperatures is also essential for enabling large-scale energy storage with safety being the primary concern.

关键词： Solid-state battery Cathode electrolyte interlayer Flame-retardant additive Cycling stability Interfacial stability

NaV3O8/poly(3,4-ethylenedioxythiophene) composites as high-rate and long-lifespan cathode materials for reversible sodium storage

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Rare Metals 2020年第8期39卷 865-873页

作者： Guo-Chun Ding Li-Min Zhu Qi Yang Ling-Ling Xie Xiao-Yu Cao Yu-Ling Wang Jian-Ping Liu Xin-Li Yang school of Chemistry and chemical engineering Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou CityHenan University of TechnologyZhengzhou 450001China school of Environmental engineering Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou CityHenan University of TechnologyZhengzhou 450001China Department of Molecular Sciences Australian Research Council Centre of Excellence for Nanoscale BioPhotonicsFaculty of Science and EngineeringMacquarie UniversitySydneyNSW 2109Australia

Sodium-ion batteries have received a surge of interests for the alternatives to lithium-ion batteries due to their abundant reserves and low *** quest of reliable and high-performance cathode materials is crucial to future Na storage ***,poly(3,4-ethylenedioxythiophene)(PEDOT)was successfully introduced to NaV3O8 via in situ oxidation polymerization,which can effectively enhance electron conductivity and ionic diffusion of NaV3O8 *** a result,these NaV3O8@-PEDOT composites exhibit a significantly improved electrochemical performance including cycle stability and rate *** particular,NaV3O8@20 wt%PEDOT composite demonstrates better dispersibility and lower charge transfer resistance compared with bare NaV3O8,which delivers the first discharge capacity of 142 mAh-g-1and holds about 128.7 mAh·g-1 after 300 cycles at a current density of 120 mA·*** at a high current density of 300 mA·g-1,a high reversible capacity of 99.6 mAh·g-1 is *** these consequences suggest that NaV3O8@20 wt%PEDOT composite may be a promising candidate to serve as a high-rate and long-lifespan cathode material for sodium-ion batteries.

关键词： Sodium-ion batteries NaV3O8@PEDOT cathode composites In situ oxidation polymerization High-rate Long-lifespan

Bacterial nanocellulose assembly into super-strong and humidity-responsive macrofibers

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Journal of Bioresources and Bioproducts 2024年第3期9卷 369-378页

作者： Yadong Zhao Zheng Yang Rusen Zhou Bin Zheng Meiling Chen Fei Liu Wenhua Miao Renwu Zhou Patrick Cullen Zhenhai Xia Liming Dai Kostya(Ken)Ostrikov school of Food and Pharmacy Zhejiang Ocean UniversityZhoushan 316022China State Key Laboratory of Electrical Insulation and Power Equipment Center for Plasma BiomedicineXi'an Jiaotong UniversityXi'an 710049China school of chemical and Biomolecular engineering University of SydneySydney 2006Australia school of Chemistry and Physics and centre for Materials Science Queensland University of TechnologyBrisbane 4000Australia Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China australian Carbon Materials centre(A-CMC) School of Chemical EngineeringUniversity of New South WalesSydneyNew South Wales 2052Australia

Cellulose macrofibers (MFs) are gaining increasing interest as natural and biodegradable alternatives to fossil-derived polymers for both structural and functional applications. However, simultaneously achieving their exceptional mechanical performance and desired functionality is challenging and requires complex processing. Here, we reported a one-step approach using a tension-assisted twisting (TAT) technique for MF fabrication from bacterial cellulose (BC). The TAT stretches and aligns BC nanofibers pre-arranged in hydrogel tubes to form MFs with compactly assembled structures and enhanced hydrogen bonding among neighboring nanofibers. The as-prepared BC MFs exhibited a very high tensile strength of 1 057 MPa and exceptional lifting capacity (over 340 000 when normalized by their own weight). Moreover, due to the volume expansion of BC nanofibers upon water exposure, BC MFs quickly harvested energy from environmental moisture to untwist the bundled networks, thus generating a torsional spinning with a peak rotation speed of 884 r/(min·m). The demonstrated rapid and intense actuation response makes the MFs ideal candidates for diverse humidity-response-based applications beyond advanced actuators, remote rain indicators, intelligent switches, and smart curtains.

关键词： Nanocellulose assembly Cellulose macrofibers Super-strong Humidity-responsive actuation Moisture Fast actuation

Chloroplast-mimicking nanoreactor for enhanced CO_(2) electrocatalysis

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Science Bulletin 2024年第18期69卷 2820-2824页

作者： Weiguang Maa Wenjun Fan Qinye Li Hefeng Zhang Kaixin Zhu Chenghua Sun Lianzhou Wang Xu Zong Clean Energy Center for Ship Marine Engineering CollegeDalian Maritime UniversityDalian 116026China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian National Laboratory for Clean EnergyThe Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)Dalian 116023China school of Science ComputingEngineering&TechnologySwinburne University of TechnologyHawthorn Vic 3122Australia Department Nanomaterials centre School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt LuciaQLD 4072Australia

Producing fuels or chemicals via electrochemical carbon dioxide reduction reaction(CO_(2)RR)with renewable electricity has attracted great research interest due to its potential of alleviating the environmental and energy issues in a carbon–neutral manner[1].The CO_(2)RR is a proton-coupled electron transfer process with the simultaneous participation of multiple protons and electrons[2].

关键词： dioxide neutral carbon

Generalized Hybrid Nanofluid Model with the Application of Fully Developed Mixed Convection Flow in a Vertical Microchannel

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Communications in Theoretical Physics 2019年第8期71卷 903-911页

作者： Hang Xu Qiang Sun State Key Laboratory of Ocean engineering School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China Particulate Fluids Processing centre Department of Chemical Engineering The University of Melbourne Parkville VIC 3010 Australia

The fully developed mixed convection hybrid nanofluid flow in a vertical microchannel is examined in *** simplified hybrid model that omits the nonlinear terms due to the interaction of different nanoparticle volumetric fractions is derived and compared with the existing *** generalized model describing hybrid nanofluid suspended with multiple kinds of solid particles is *** argument that the corresponding nanofluid solutions obtained by the homogenous model can be recovered from the results of the regular problems through simple arithmetic operations is *** in similarity form for this flow problem are formulated by means of a set of similarity *** effects of various parameters on important physical quantities are analyzed and discussed.

关键词： hybrid nanofluid vertical channel mixed convection slippery effect