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A photothermal reservoir for highly efficient solar steam generation without bulk water

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Science Bulletin 2019年第21期64卷 1625-1633页

作者： xuan Wu Ting Gao Chenhui Han Jingsan xu Gary Owens haolan xu Future Industries Institute University of South AustraliaMawson Lakes CampusSA 5095Australia School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia

A solid photothermal reservoir is designed to implement solar-steam generation in the absence of bulk *** photothermal reservoir is composed of a water absorbing core encapsulated by a photothermal reduced graphene oxide based aerogel sheet which absorbs light and converts it into heat thus evaporating the stored *** photothermal reservoir is able to store 6.5 times its own weight in water,which is sufficient for one day solar evaporation,thus no external water supplement is *** solar-steam generation,since no bulk water is involved,the photothermal reservoir minimizes heat conduction loss,and maximizes both of the exposed evaporation surface area and net energy gain from the environment,leading to an energy efficiency beyond the theoretical *** extremely high water evaporation rate of 4.0 kg m-2 h-1(normalized to projection area)is achieved in laboratory studies over a cylinder photothermal reservoir with a diameter of 5.2 cm and a height of 15 cm under 1.0 sun *** evaluation of the photothermal reservoir outdoors as part of a desalination device demonstrates a similar evaporation rate where the salinity of the clean water produced is lower than 24 *** the photothermal reservoir shows great potential for real world applications in portable solarthermal desalination.

关键词： Solar-steam generation Photothermal Aerogel Solar-thermal energy

Porous carbon-based thermally conductive materials:Fabrication,functions and applications

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Chinese Journal of Structural Chemistry 2023年第4期42卷 58-72页

作者： Deyu Wang xuan Wu Gary Owens haolan xu Future Industries Institute UniSA STEMUniversity of South AustraliaMawson Lakes CampusAdelaideSA 5095Australia

The demand for electronic devices has dramatically increased in the past few *** electronic devices require excellent thermal management systems to extend their operation time and prevent heat accumulation from affecting *** materials are considered as one of the ideal thermal management materials due to their excellent physiochemical *** addition,since porous-structured carbon materials typically exhibit outstanding thermal conductivity,low density,and large contact area,they have attracted considerable attention from both academia and industry in the last *** this review,methods and strategies for the preparation of highly thermally conductive porous carbon-based materials and the factors that influence their thermal conductivity of the materials are *** thermal performance of porous carbonaceous materials fabricated by different approaches and their applications are also ***,the potential challenges and strategies for the development and applications of highly thermally conductive porous carbona-ceous materials are discussed.

关键词： Porous carbon-based materials Graphene networks Carbon foams Thermal conductivity Solar steam generation

Boosting extraction of Pb in contaminated soil via interfacial solar evaporation of multifunctional sponge

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Green Energy & Environment 2023年第5期8卷 1459-1468页

作者： Pan Wu xuan Wu Yida Wang Jingyuan Zhao haolan xu Gary Owens Future Industries Institute UniSA STEMUniversity of South AustraliaMawson Lakes CampusSA 5095Australia

Interfacial solar water evaporation is a reliable way to accelerate water evaporation and contaminant *** the recent advance in photothermal technology,a functional sponge was prepared by coating a sodium alginate(SA)impregnated sponge with a surface layer of reduced graphene oxide(rGO)to act as a photothermal conversion medium and then subsequently evaluated for its ability to enhance Pb extraction from contaminated soil driven by interfacial solar *** SA loaded sponge had a Pb adsorption capacity of 107.4 mg g^(-1).Coating the top surface of the SA sponge with rGO increased water evaporation performance to 1.81 kg m^(-2)h^(-1)in soil media under one sun illumination and with a wind velocity of 2 m s^(-1).Over 12 continuous days of indoor evaporation testing,the Pb extraction efficiency was increased by 22.0%under 1 sun illumination relative to that observed without ***,Pb extraction was further improved by 48.9%under outdoor evaporation conditions compared to indoor ***,this initial work shows the significant potential of interfacial solar evaporation technologies for Pb contaminated soil remediation,which should also be applicable to a variety of other environmental contaminants.

关键词： Photothermal materials Interfacial solar evaporation Reduced graphene oxide Pb extraction Soil remediation

Harvesting,sensing and regulating light based on photo-thermal effect of Cu@CuO mesh

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Green Energy & Environment 2017年第4期2卷 387-392页

作者： xuan Wu Jie xu George Y.Chen Rong Fan Xiaokong Liu haolan xu Future Industries Institute University of South Australia Mawson Lakes Campus Laser Physics and Photonic Devices Laboratories School of Engineering University of South Australia Mawson Lakes Campus School of Natural and Built Environments University of South Australia Mawson Lakes Campus

A system of light harvesting, sensing and regulating was designed based on the photo-thermal and Seebeck effect of flexible CuO nanostructures. Cu@CuO meshes were prepared via self-oxidation of Cu mesh and utilized as the photo-thermal material. Upon irradiation by visible light, the temperature of the Cu@CuO mesh dramatically increases. The temperature difference between the irradiated and non-irradiated parts of the Cu@CuO mesh produced a measurable voltage output due to the Seebeck effect. The generated voltage was then converted into a digital signal to control a rotary neutral-density disc to filter the received light. This enabled regulation of the intensity of the incident light at a selected region. This system is cost effective and has potential applications in greenhouses, factories and smart buildings to minimize energy consumption and improve wellbeing.

关键词： Photothermal Light CuO Nanostructure

Mechanically Strong and Highly Stiff Supramolecular Polymer Composites Repairable at Ambient Conditions

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CCS Chemistry 2020年第4期2卷 280-292页

作者： Jingjing Zhu George YChen Li Yu haolan xu Xiaokong Liu Junqi Sun State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012 Laser Physics and Photonic Devices Laboratories School of EngineeringUniversity of South AustraliaMawson LakesSouth Australia 5095 College of Health Science and Environmental Engineering Shenzhen Technology UniversityShenzhen 518118 Future Industries Institute University of South AustraliaMawson LakesSouth Australia 5095

It is a formidable challenge to fabricate healable polymeric materials with high mechanical strength and stiffness due to the highly suppressed diffusion of their polymer ***,a high-strength,highly stiff,andrepairable/healable supramolecular polymercomposite was fabricatedby complexingpoly(acrylic acid)(PAA)and poly(allylamine hydrochloride)(PAH)in aqueous solutions,followed by molding into desired *** tuning the electrostatic and H-bonding interactions between PAA and PAH led to associative phase-separation and in situ formation of nanostructures in the resultant PAA–PAH composites.

关键词： supramolecular polymers self-assembly self-healing materials supramolecular composites polymer complexes phase-separated nanostructures

Recent strategies for constructing efficient interfacial solar evaporation systems

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Nano Research Energy 2023年第2期2卷 26-44页

作者： Yida Wang Junqing Hu Li Yu xuan Wu Yingying Zhang haolan xu Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China College of Health Science and Environmental Engineering Shenzhen Technology UniversityShenzhen 518118China Future Industries Institute UniSA STEMUniversity of South AustraliaMawson Lakes CampusSA 5095Australia

Interfacial solar evaporation(ISE)is a promising technology to relieve worldwide freshwater shortages owing to its high energy conversion efficiency and environmentally sustainable *** far,many innovative materials and evaporators have been proposed and applied in ISE to enable highly controllable and efficient solar-to-thermal energy *** rational design,solar evaporators can achieve excellent energy management for lowering energy loss,harvesting extra energy,and efficiently utilizing energy in the system to improve freshwater *** that,a strategy of reducing water vaporization enthalpy by introducing molecular engineering for water-state regulation has also been demonstrated as an effective approach to boost *** on these,this article discusses the energy nexus in two-dimensional(2D)and three-dimensional(3D)evaporators separately and reviews the strategies for design and fabrication of highly efficient ISE *** summarized work offers significant perspectives for guiding the future design of ISE systems with efficient energy management,which pave pathways for practical applications.

关键词： interfacial solar evaporation photothermal materials energy management molecular engineering

Enhancing solar steam generation using a highly thermally conductive evaporator support

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Science Bulletin 2021年第24期66卷 2479-2488,M0004页

作者： Yida Wang xuan Wu Pan Wu Jingyuan Zhao Xiaofei Yang Gary Owens haolan xu Future Industries Institute University of South AustraliaMawson Lakes CampusAdelaideSA 5095Australia College of Science Nanjing Forestry UniversityNanjing 210037China

Interfacial solar steam generation is an efficient water evaporation technology which has promising applications in desalination,sterilization,water purification and treatment.A common component of evaporator design is a thermal-insulation support placed between the photothermal evaporation surface and bulk *** configuration,common in 2-dimensional(2 D)evaporation systems,minimizes heat loss from evaporation surface to bulk water,thus localizing the heat on the evaporation surface for efficient *** design is subsequently directly adopted for 3-dimensional(3 D)evaporators without any consideration if it is ***,unlike 2 D solar evaporators,the 3 D evaporators can also harvest additional energy(other than solar light)from the air and bulk water to enhance evaporation *** this scenario,the use of thermal insulator support is not proper since it will hinder energy extraction from ***,the traditional 3 D evaporator configuration was completely redesigned by using a highly thermally conductive material,instead of a thermal insulator,to connect evaporation surfaces and the bulk *** higher evaporation rates were achieved by this strategy,owing to the rapid heat transfer from the bulk water to the evaporation *** and outdoor tests both confirmed that evaporation performance could be significantly improved by substituting a thermal insulator with thermally conductive *** findings will redirect the future design of 3 D photothermal evaporators.

关键词： Solar steam generation Photothermal materials Heat conduction Reduced graphene oxide Water evaporation 3D evaporator

Boosting solar steam generation by structure enhanced energy management

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Science Bulletin 2020年第16期65卷 1380-1388,M0004页

作者： Yida Wang xuan Wu Bo Shao Xiaofei Yang Gary Owens haolan xu Future Industries Institute University of South AustraliaMawson Lakes Campus AdelaideSA 5095Australia College of Science.Nanjing Forestry University Nanjing 210037China

Interfacial solar-steam generation is a promising and cost-effective technology for both desalination and wastewater *** process uses a photothermal evaporator to absorb sunlight and convert it into heat for water *** solar-steam generation can be somewhat inefficient due to energy losses via conduction,convection and ***,efficient energy management is crucial for optimizing the performance of solar-steam ***,via elaborate design of the configuration of photothermal materials,as well as warm and cold evaporation surfaces,performance in solar evaporation was significantly *** was achieved via a simultaneous reduction in energy loss with a net increase in energy gain from the environment,and recycling of the latent heat released from vapor condensation,diffusive reflectance,thermal radiation and convection from the evaporation ***,by using the new strategy,an evaporation rate of 2.94 kg m^-2 h^-1,with a corresponding energy efficiency of solar-steam generation beyond theoretical limit was achieved.

关键词： Solar-steam generation Photothermal Energy management Latent heat recycling Reduced graphene oxide Desalination

Ag nanoparticles anchored organic/inorganic Z‐scheme 3DOMM‐TiO_(2‒x)‐based heterojunction for efficient photocatalytic and photoelectrochemical water splitting

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Chinese Journal of Catalysis 2022年第5期43卷 1360-1370页

作者： Zhiying xu Chunyu Guo Xin Liu Ling Li Liang Wang haolan xu Dongke Zhang Chunhu Li Qin Li Wentai Wang Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100ShandongChina Institute for New Energy Materials and Low‐Carbon Technologies Tianjin University of TechnologyTianjin 300384China Future Industries Institute UniSA STEMUniversity of South AustraliaMawson Lakes CampusSouth Australia 5095Australia Centre for Energy(M473) The University of Western Australia35 Stirling HighwayCrawleyWestern Australia 6009Australia Queensland Micro‐and Nanotechnology Centre Griffith University Nathan CampusBrisbaneQueensland 4111Australia College of Food Engineering Qingdao Institute of TechnologyQingdao 266300ShandongChina

Narrow spectral response,low charge separation efficiency and slow water oxidation kinetics of TiO_(2)limit its application in photoelectrochemical and photocatalytic water ***,a promising organic/inorganic composite catalyst Ag/PANI/3DOMM‐TiO_(2–x)with a three‐dimensional ordered macro‐and meso‐porous(3DO MM)structure,oxygen vacancy and Ti^(3+)defects,heterojunction formation and noble metal Ag was designed based on the Z‐scheme mechanism and successfully *** Ag/PANI/3DOMM‐TiO_(2–x)ternary catalyst exhibited enhanced hydrogen production activity in both photocatalytic and photoelectrochemical water *** photocatalytic hydrogen production rate is 420.90μmol g^(–1)h^(–1),which are 19.80 times and 2.06 times higher than the commercial P25 and 3DOMM‐TiO_(2),*** the photoelectrochemical tests,the Ag/PANI/3DOMM‐TiO_(2–x)photoelectrode shows enhanced separation and transfer of carriers with a high current density of 1.55 mA cm^(–2)at equilibrium potential of 1.23 V under simulated AM 1.5 G illumination,which is approximately 5 times greater than the 3DOMM‐TiO_(2).The present work has demonstrated the promising potential of organic/inorganic Z‐scheme photocatalyst in driving water splitting for hydrogen production.

关键词： Photoelectrochemical Photocatalysis Organic/inorganic composite Heterojunction Water splitting