The shortage of fresh water in the world has brought upon a serious crisis to human health and economic development.Solar‐driven interfacial photothermal conversion water evaporation including evaporating seawater,la...The shortage of fresh water in the world has brought upon a serious crisis to human health and economic development.Solar‐driven interfacial photothermal conversion water evaporation including evaporating seawater,lake water,or river water has been recognized as an environmentally friendly process for obtaining clean water in a low‐cost way.However,water transport is restricted by itself by solar energy absorption capacity's limits,especially for finite evaporation rates and insufficient working life.Therefore,it is important to seek photothermal conversion materials that can efficiently absorb solar energy and reasonably design solar‐driven interfacial photothermal conversion water evaporation devices.This paper reviews the research progress of carbon‐based photothermal conversion materials and the mechanism for solar‐driven interfacial photothermal conversion water evaporation,as well as the summary of the design and development of the devices.Based on the research progress and achievements of photothermal conversion materials and devices in the fields of seawater desalination and photothermal electric energy generation in recent years,the challenges and opportunities faced by carbon‐based photothermal conversion materials and devices are discussed.The prospect of the practical application of solar‐driven interfacial photothermal conversion evaporation technology is foreseen,and theoretical guidance is provided for the further development of this technology.展开更多
With the increasing energy demand together with the deteriorating environment and decreasing fossil fuel resources,the development of highly efficient energy conversion and storage devices is one of the key challenges...With the increasing energy demand together with the deteriorating environment and decreasing fossil fuel resources,the development of highly efficient energy conversion and storage devices is one of the key challenges of both fundamental and applied research in energy technology.Melamine sponges(MS)with low density,high nitrogen content,and high porosity have been used to design and obtain three‐dimensional porous carbon electrode materials.More importantly,they are inexpensive,environment‐friendly,and easy to synthesize.There have been many reports on the modification of carbonized MS and MS‐based composites for supercapacitor and lithium battery electrode materials.In this paper,recent studies on the fabrication of electrode materials using MS as raw materials have been mainly reviewed,including carbonation,doping activation,and composite modification of MS,and expectations for the development of porous carbon materials for energy storage as a reference with excellent performance,environment‐friendliness,and long life.展开更多
The MnZn ferrite coating formed on the surface of iron-based soft magnetic powders via facile and modified sol–gel process has been fabricated to obtain better magnetic performance due to its higher permeability comp...The MnZn ferrite coating formed on the surface of iron-based soft magnetic powders via facile and modified sol–gel process has been fabricated to obtain better magnetic performance due to its higher permeability compared with traditional nonmagnetic insulation coatings. The influence of the MnZn ferrite contents on the magnetic performance of the soft magnetic composites(SMCs) has been studied. As the MnZn insulation content increases, the core loss first experiences a decreasing trend that is followed by progressive increase, while the permeability follows an increasing trend and subsequently degrades. The optimized magnetic performance is achieved with 2.0 wt% MnZn ferrite, which results from the decrement of inter-particle eddy current losses based on loss separation. A uniform and compact coating layer composed of MnZn ferrite and oxides with an average thickness of 0.38 ± 0.08 μm is obtained by utilizing ion beam technology, and the interface between the powders and the coating shows satisfied adhesiveness compared with the sample directly prepared by mechanical mixing. The evolution of the coating layers during the calcination process has been presented based on careful analysis of the composition and microstructure.展开更多
To improve the harvesting of visible light and reduce the recombination of photogenerated electrons and holes,Ti^(3+)self-doped Ti O_2 nanoparticles were synthesized and assembled into photoanodes with high visible li...To improve the harvesting of visible light and reduce the recombination of photogenerated electrons and holes,Ti^(3+)self-doped Ti O_2 nanoparticles were synthesized and assembled into photoanodes with high visible light photoelectrochemical properties.X-ray diffraction,transmission electron microscopy,X-ray photoelectron spectra,electron resonance spectroscopy and energy dispersive X-ray spectra were used to characterize the structure,crystallinity,morphology and other properties of the obtained nanoparticles.UV–visible diffuse reflectance spectra showed that the Ti^(3+)self-doped Ti O_2 nanoparticles had a strong absorption between 400 and 800 nm.Moreover,when hydrothermal treatment time was prolonged to 22 h,the heterogeneous junction was formed between the anatase and rutile Ti O_2,where the anatase particles exposed highly active {001} facets.Under visible light irradiation,the Ti^(3+)self-doped Ti O_2 electrode exhibited an excellent photoelectrocatalytic degradation of rhodamine B(Rh B) and water splitting performance.Intriguingly,by selecting an appropriate hydrothermal time,the high photoconversion efficiency of 1.16% was achieved.展开更多
Aqueous zinc-ion batteries are attracting considerable attention because of their high safety compared with conventional lithium-ion batteries.Manganese-based materials have been widely developed for zinc-ion batterie...Aqueous zinc-ion batteries are attracting considerable attention because of their high safety compared with conventional lithium-ion batteries.Manganese-based materials have been widely developed for zinc-ion batteries cathode owning to their low cost,high security and simple preparation.However,the severe volume expansion and poor stability during charging and discharging limit the further development of manganese-based cathodes.Herein,superiorα-MnO_(2)@g-C_(3)N_(4)was successfully prepared for stable zinc-ion batteries(ZIBs)cathode by introducing g-C_(3)N_(4)nanosheets.Compared with pureα-MnO_(2),αMnO_(2)@g-C_(3)N_(4)has a specific capacity of 298 mAh·g^(-1)at 0.1 A·g^(-1).Even at 1 A·g^(-1),theα-MnO_(2)@g-C_(3)N_(4)still retains 100 mAh·g^(-1)(83.4%retention after 5000 cycles),implying its excellent cycling stability.Theα-MnO_(2)@gC_(3)N_(4)-based cathode has the highest energy density(563 Wh·kg^(-1))and power energy density(2170 W·kg^(-1)).This work provides new avenues for the development of a wider range of cathode materials for ZIBs.展开更多
基金Natural Science Foundation of Shandong Province,Grant/Award Number:ZR2019MB019National Natural Science Foundation of China,Grant/Award Numbers:22075122,52071295Research Foundation for Talented Scholars of Linyi University,Grant/Award Number:Z6122010。
文摘The shortage of fresh water in the world has brought upon a serious crisis to human health and economic development.Solar‐driven interfacial photothermal conversion water evaporation including evaporating seawater,lake water,or river water has been recognized as an environmentally friendly process for obtaining clean water in a low‐cost way.However,water transport is restricted by itself by solar energy absorption capacity's limits,especially for finite evaporation rates and insufficient working life.Therefore,it is important to seek photothermal conversion materials that can efficiently absorb solar energy and reasonably design solar‐driven interfacial photothermal conversion water evaporation devices.This paper reviews the research progress of carbon‐based photothermal conversion materials and the mechanism for solar‐driven interfacial photothermal conversion water evaporation,as well as the summary of the design and development of the devices.Based on the research progress and achievements of photothermal conversion materials and devices in the fields of seawater desalination and photothermal electric energy generation in recent years,the challenges and opportunities faced by carbon‐based photothermal conversion materials and devices are discussed.The prospect of the practical application of solar‐driven interfacial photothermal conversion evaporation technology is foreseen,and theoretical guidance is provided for the further development of this technology.
基金supported by the Science and Technology Development Plan Project of Shandong Province(2014GSF117015)the National Basic Research Program of China(973 program,2013CB632401)the National Natural Science Foundation of China(51402145)~~
基金The authors appreciate the support from the Natural Science Foundation of Shandong Province(ZR2019MB019,ZR2018MEM020)We also acknowledge financial support from the Key Research and Development Program of Shandong Province(2019GSF111047).
文摘With the increasing energy demand together with the deteriorating environment and decreasing fossil fuel resources,the development of highly efficient energy conversion and storage devices is one of the key challenges of both fundamental and applied research in energy technology.Melamine sponges(MS)with low density,high nitrogen content,and high porosity have been used to design and obtain three‐dimensional porous carbon electrode materials.More importantly,they are inexpensive,environment‐friendly,and easy to synthesize.There have been many reports on the modification of carbonized MS and MS‐based composites for supercapacitor and lithium battery electrode materials.In this paper,recent studies on the fabrication of electrode materials using MS as raw materials have been mainly reviewed,including carbonation,doping activation,and composite modification of MS,and expectations for the development of porous carbon materials for energy storage as a reference with excellent performance,environment‐friendliness,and long life.
基金Project supported by the Natural Science Foundation of Shandong Province,China(Grant No.ZR2018MEM020)
文摘The MnZn ferrite coating formed on the surface of iron-based soft magnetic powders via facile and modified sol–gel process has been fabricated to obtain better magnetic performance due to its higher permeability compared with traditional nonmagnetic insulation coatings. The influence of the MnZn ferrite contents on the magnetic performance of the soft magnetic composites(SMCs) has been studied. As the MnZn insulation content increases, the core loss first experiences a decreasing trend that is followed by progressive increase, while the permeability follows an increasing trend and subsequently degrades. The optimized magnetic performance is achieved with 2.0 wt% MnZn ferrite, which results from the decrement of inter-particle eddy current losses based on loss separation. A uniform and compact coating layer composed of MnZn ferrite and oxides with an average thickness of 0.38 ± 0.08 μm is obtained by utilizing ion beam technology, and the interface between the powders and the coating shows satisfied adhesiveness compared with the sample directly prepared by mechanical mixing. The evolution of the coating layers during the calcination process has been presented based on careful analysis of the composition and microstructure.
基金supported by the Key Project of Natural Science Foundation of Shandong Province(ZR2013EMZ001)the National Basic Research Program of China(Grant No.2013CB632401)+1 种基金the National Nature Science Foundation of China(51,402,145)the National University Student Innovation Program(201,510,532,033)
文摘To improve the harvesting of visible light and reduce the recombination of photogenerated electrons and holes,Ti^(3+)self-doped Ti O_2 nanoparticles were synthesized and assembled into photoanodes with high visible light photoelectrochemical properties.X-ray diffraction,transmission electron microscopy,X-ray photoelectron spectra,electron resonance spectroscopy and energy dispersive X-ray spectra were used to characterize the structure,crystallinity,morphology and other properties of the obtained nanoparticles.UV–visible diffuse reflectance spectra showed that the Ti^(3+)self-doped Ti O_2 nanoparticles had a strong absorption between 400 and 800 nm.Moreover,when hydrothermal treatment time was prolonged to 22 h,the heterogeneous junction was formed between the anatase and rutile Ti O_2,where the anatase particles exposed highly active {001} facets.Under visible light irradiation,the Ti^(3+)self-doped Ti O_2 electrode exhibited an excellent photoelectrocatalytic degradation of rhodamine B(Rh B) and water splitting performance.Intriguingly,by selecting an appropriate hydrothermal time,the high photoconversion efficiency of 1.16% was achieved.
基金the Natural Science Foundation of Shandong Province(Grant Nos.ZR2019MB019,ZR2019QB023)for financial support.
文摘Aqueous zinc-ion batteries are attracting considerable attention because of their high safety compared with conventional lithium-ion batteries.Manganese-based materials have been widely developed for zinc-ion batteries cathode owning to their low cost,high security and simple preparation.However,the severe volume expansion and poor stability during charging and discharging limit the further development of manganese-based cathodes.Herein,superiorα-MnO_(2)@g-C_(3)N_(4)was successfully prepared for stable zinc-ion batteries(ZIBs)cathode by introducing g-C_(3)N_(4)nanosheets.Compared with pureα-MnO_(2),αMnO_(2)@g-C_(3)N_(4)has a specific capacity of 298 mAh·g^(-1)at 0.1 A·g^(-1).Even at 1 A·g^(-1),theα-MnO_(2)@g-C_(3)N_(4)still retains 100 mAh·g^(-1)(83.4%retention after 5000 cycles),implying its excellent cycling stability.Theα-MnO_(2)@gC_(3)N_(4)-based cathode has the highest energy density(563 Wh·kg^(-1))and power energy density(2170 W·kg^(-1)).This work provides new avenues for the development of a wider range of cathode materials for ZIBs.
基金This work was supported by the Key Project of Natural Science Foundation of Shandong Province (No. ZR2013EMZ001), the Science and Technology Development Plan Project of Shandong Province (No. 2014GSF117015), the National Basic Research Program of China (No. 2013CB632401) and the National Natural Science Foundation of China (No. 51402145). This work was also supported by the U.S. Department of Energy under Contract DE-AC0206CH11357 with the main support provided by the Vehicle Technologies Office, Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE).