Designing highly efficient and stable photocatalysts is of vital importance for solar-to-fuel conversion,as a potential strategy to address the concerns of global energy crisis and environmental *** development of nov...
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Designing highly efficient and stable photocatalysts is of vital importance for solar-to-fuel conversion,as a potential strategy to address the concerns of global energy crisis and environmental *** development of novel photocatalytic materials is desirable to overcome those shortcomings of traditional semiconductor photocatalysts.
The objective of this paper is to understand the flow mechanism through visualization experiments and discuss theinfluence of process parameters on mold filling process. A 2D leakage flow model is developed to simulat...
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The objective of this paper is to understand the flow mechanism through visualization experiments and discuss theinfluence of process parameters on mold filling process. A 2D leakage flow model is developed to simulate the moldingprocess, and the simulation results show good agreement with experiments.
In this work,homogeneous Ni0.33Co0.67Se hollow nanoprisms were synthesized successfully in virtue of Kirkendall *** is the first time for bimetallic Ni-Co compounds Ni0.33Co0.67Se to be used in lithium-ion batteries (...
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In this work,homogeneous Ni0.33Co0.67Se hollow nanoprisms were synthesized successfully in virtue of Kirkendall *** is the first time for bimetallic Ni-Co compounds Ni0.33Co0.67Se to be used in lithium-ion batteries (LIBs).Impressively,the Ni0.33Co0.67Se hollow nanoprisms show superior specific capacity (1,575 mAh/g at the current density of 100 mA/g) and outstanding rate performance (850 mAh/g at 2,000 mA/g) as anode material for *** work proves the potential of bimetallic chalcogenide compounds as high performance anode materials for LIBs.
In order to improve the wear resistance, a kind of alumina ceramic with good wear resistance was created in an Al_2O_3-CaC_O3-SiO_2-MgO-La_2O_3（ACSML） system. The effects of La_2O_3 content on sintering temperature,...
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In order to improve the wear resistance, a kind of alumina ceramic with good wear resistance was created in an Al_2O_3-CaC_O3-SiO_2-MgO-La_2O_3（ACSML） system. The effects of La_2O_3 content on sintering temperature, bulk density, and wear rate were investigated. The wear rate of sample was as low as 0.0393‰. The wear resistance of the sample containing La_2O_3 has improved 43% than that of the sample without La_2O_3. Appropriate La_2O_3 doping could inhibit grain growth, enhance density, and purify grain boundary. La_2O_3 could diffuse into Al_2O_3 to form a solid solution and react with Al_2O_3 to form high-aluminum low-lanthanum complex oxides. The combination among Al_2O_3, the solid solution layer, and the layer of high-aluminum low-lanthanum complex oxides combined closely, which could improve grain boundary cohesion. Besides, the homogeneous distributions of elements made uniform structure. Finally, the wear resistance of alumina ceramic was improved.
High-performance anode is hurdle for on-chip planar microsupercapacitor(MSC).Polypyrrole(PPy)is a highly attractive pseudocapacitive material,but its low cycling stability,and low adhesion with current collector hinde...
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High-performance anode is hurdle for on-chip planar microsupercapacitor(MSC).Polypyrrole(PPy)is a highly attractive pseudocapacitive material,but its low cycling stability,and low adhesion with current collector hinder its *** we propose one-prong generic strategy to boost the cycling stability of *** our strategy,the electrochemical deposition of multilayered reduced graphene oxide(rGO)on micropatterned Au is utilized,and the resultant rGO@Au pattern is then used for growing highly porous PPy nanostructures by facile electrochemical *** fabricated PPy anode on rGO@Au has quasi rectangular cyclic voltammetry curves up to-0.7 V and exceptional cycling stability,retaining82%of capacitance after 10,000 charge/discharge cycles in 2 M KCl *** outstanding reliability of PPy on rGO@Au is due to the flexibility of rGO,accommodating structural pulverization and providing a promising background for the nucleation of highly porous ***,an all-polymer based asymmetric aqueous MSC(AMSC)is constructed with PPy anode and PEDOT cathode,which exhibited excellent electrochemical performance compared with conventional symmetric MSCs based on conducting *** constructed AMSC delivered a maximum areal capacitance of 15.9 m F cm^-2(99.3 F cm^-3),high specific energy and power densities of 4.3μWh cm^-2(27.03 mWh cm^-3)and 0.36 W cm^-2(0.68 W cm^-3)at 1.4 V,*** enhanced electrochemical performances can be illustrated by nucleation mechanism,in which surface topology of r GO generates a promising background for nucleation and electrochemical growth of nanoporous pseudocapacitive conducting polymers with superior interfacial contact and improved surface area.
Carbon nanotubes（CNTs） decorated with palladium were synthesized and applied to hydrogen storage of gas phase. The results show that the amount of hydrogen storage of the decorated CNTs is up to 3.9%（mass fraction...
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Carbon nanotubes（CNTs） decorated with palladium were synthesized and applied to hydrogen storage of gas phase. The results show that the amount of hydrogen storage of the decorated CNTs is up to 3.9%（mass fraction）, of which, almost 85% H2 can be desorbed at ambient temperature and pressure, while the non-decorated CNTs has a poor performance of hydrogen storage（only about 0.5%H2, mass fraction）. These indicate that it is feasible to enhance the performance of hydrogen storage of CNTs by further decoration with hydrogen-storing metals or alloys.
Ammonia decomposition for hydrogen production has become a critical process in the development of hydrogen economy. Non-noble based material possesses great potential of application in thermal catalysis due to its low...
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Electroless CoNiWP magnetic films were prepared by varying the bath pH and then characterized by energy dispersive X-ray analysis, X-ray diffraction and magnetic force microscopy, it has been found that the microstruc...
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Electroless CoNiWP magnetic films were prepared by varying the bath pH and then characterized by energy dispersive X-ray analysis, X-ray diffraction and magnetic force microscopy, it has been found that the microstructure and the magnetic properties of films were influenced greatly by the bath pH. At the bath pH 8.06, the grain size and coercivity of the films reach maximuml while the squareness （Mr/Ms） of MH curves reaches minimum. The Henkel plots indicates that the exchange-coupling interaction is very weak at this pH, which may be caused by phase-separation and large grain size, and then results in the lowest squareness. At pH above 8.5, obvious exchange-coupling interaction is observed because of the inexistence of phase-separation and the refinement of grain size.
A kind of W/W-Mo/Mo system layered flier-plate material (LFP) was fabricated in this study by the methods of powder metallurgy and bonding together. Such LFP had high parallelism,planeness and densification and its de...
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A kind of W/W-Mo/Mo system layered flier-plate material (LFP) was fabricated in this study by the methods of powder metallurgy and bonding together. Such LFP had high parallelism,planeness and densification and its density varied from 17.25x103 kg/m3 to 10.22x103 kg/m3 through a total thickness of 3.0 mm. The W-Mo interlayer of this LFP was obtained by hot-press sintering and its densification at 1573 K was studied. Then by using additives 4Ni-3Cu (in wt pct), the LFP was fabricated under 1573 K-30 MPa-60 min. The mechanism of the interfacial bonding of the W/W-Mo/Mo system LFP was also mainly investigated.
Nanocomposites offer a promising approach to the incorporation of nanostructured constituents into bulk thermo- electric materials. The 0.7-at% Bi-doped Mg2Si nanocomposites are prepared by spark plasma sintering of t...
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Nanocomposites offer a promising approach to the incorporation of nanostructured constituents into bulk thermo- electric materials. The 0.7-at% Bi-doped Mg2Si nanocomposites are prepared by spark plasma sintering of the mixture of nanoscale and microsized 0.7-at% Bi-doped Mg2Si powders. Microstructure analysis shows that the bulk material is composed of nano- and micrograins. Although the nanograin hinders electrical conduction, the nanocomposite struc- ture is more helpful to reduce thermal conductivity and increase the Seebeck coefficient, hence improving thermoelectric performance. A dimensionless figure of merit of 0.8 is obtained for the 0.7-at% Bi-doped Mg2Si nanocomposite with 50-wt % nanopowder, which is about twice larger than that of the sample without nanopowder.
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