scholarly journals Small-pore driven high capacitance in a hierarchical carbon via carbonization of Ni-MOF-74 at low temperatures

2016 ◽  
Vol 52 (58) ◽  
pp. 9141-9144 ◽  
Author(s):  
J. A. Carrasco ◽  
J. Romero ◽  
G. Abellán ◽  
J. Hernández-Saz ◽  
S. I. Molina ◽  
...  
Keyword(s):  
Low Temperature ◽  
Specific Capacitance ◽  
Low Temperatures ◽  
High Specific Capacitance ◽  
High Capacitance ◽  
Small Pore ◽  
Hierarchical Carbon

Low temperature carbonization of Ni-MOF-74 yields carbon with high specific capacitance linked to the presence of very small micropores.

Low-temperature microwave-assisted hydrothermal fabrication of RGO/MnO2–CNTs nanoarchitectures and their improved performance in supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98010-98017 ◽  
Author(s):  
Jie Zhang ◽  
Hailang Zhang ◽  
Yingjun Cai ◽  
Haitao Zhang
Keyword(s):  
Low Temperature ◽  
Specific Capacitance ◽  
High Specific Capacitance ◽  
Microwave Assisted ◽  
Improved Performance

RGO/MnO2–CNTs nanoarchitectures have been successfully synthesized at low temperature and exhibit high specific capacitance and reversibility.

scholarly journals Ultralight, High Capacitance, Mechanically Strong Graphene-Cellulose Aerogels

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4891
Author(s):  
Xiuya Wang ◽  
Ke Wan ◽  
Pengbo Xie ◽  
Yuanyuan Miao ◽  
Zhenbo Liu
Keyword(s):  
Mechanical Properties ◽  
Specific Capacitance ◽  
Energy Demand ◽  
High Surface ◽  
High Surface Area ◽  
High Specific Capacitance ◽  
High Capacitance ◽  
Electrochemical Tests ◽  
Composite Aerogels ◽  
One Step

With increasing energy demand driving the need for eco-friendly and efficient energy storage technology, supercapacitors are becoming increasingly prevalent in wearable devices because of their portability and stability. The performance of these supercapacitors is highly dependent on the choice of electrode material. The high capacitance and mechanical properties needed for these materials can be achieved by combining graphene’s stable electrical properties with renewable cellulose’s excellent mechanical properties into porous aerogels. In this study, graphene-cellulose hydrogels were prepared by a one-step hydrothermal method, with porous, ultra-light, and mechanically strong graphene-cellulose aerogels then prepared by freeze-drying. These composite aerogels possess excellent mechanical strength and high specific capacitance, capable of bearing about 1095 times the pressure of their own weight. Electrochemical tests show the specific capacitance of these composite aerogels can reach 202 F/g at a scanning rate of 5 mA/cm2. In view of their high surface area and fast charge transport provided by their 3D porous structure, graphene-cellulose aerogels have great potential as sustainable supercapacitor electrodes.

Carbon quantum dots/nickel oxide (CQDs/NiO) nanorods with high capacitance for supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 5541-5546 ◽  
Author(s):  
J. Xu ◽  
Y. Xue ◽  
J. Cao ◽  
G. Wang ◽  
Y. Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Thermal Treatment ◽  
Nickel Oxide ◽  
Specific Capacitance ◽  
Treatment Process ◽  
High Specific Capacitance ◽  
Carbon Quantum Dots ◽  
High Capacitance ◽  
Electroactive Materials

Novel CQDs/NiO nanorods have been prepared via a facile complexation method followed by a thermal treatment process and used as electroactive materials for supercapacitors, which deliver a high specific capacitance of 1858 F g−1 at 1 A g−1.

Dihydrophenazine linked porous organic polymers for high capacitance and energy density pseudocapacitive electrodes and devices

2021 ◽  
Author(s):  
Huanhuan Zhang ◽  
Xiaohui Tang ◽  
Cheng Gu
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
High Specific Capacitance ◽  
Organic Polymer ◽  
Organic Polymers ◽  
Porous Organic Polymers ◽  
High Capacitance ◽  
Porous Organic Polymer

A dihydrophenazine linked porous organic polymer, GT-POP-1, is synthesized and shows high specific capacitance and energy density metrics of 97.1 mF cm−2 and 7.3 μW h cm−2, respectively.

In situ Tensile Experiments at Low Temperatures on Niobium Single Crystals by H.V.E.M.

1975 ◽  
Vol 33 ◽  
pp. 58-59
Author(s):  
F. H. Louchet ◽  
L. P. Kubin
Keyword(s):  
Electron Microscope ◽  
Transition Temperature ◽  
Low Temperature ◽  
Slip System ◽  
Low Temperatures ◽  
Tensile Axis ◽  
Image Intensifier ◽  
Screw Dislocations ◽  
Source Operation

Experiments have been carried out on the 3 MeV electron microscope in Toulouse. The low temperature straining holder has been previously described Images given by an image intensifier are recorded on magnetic tape.The microtensile niobium samples are cut in a plane with the two operative slip directions [111] and lying in the foil plane. The tensile axis is near [011].Our results concern:- The transition temperature of niobium near 220 K: at this temperature and below an increasing difference appears between the mobilities of the screw and edge portions of dislocations loops. Source operation and interactions between screw dislocations of different slip system have been recorded.

INVAR M93

Alloy Digest ◽  
2008 ◽  
Vol 57 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Low Temperatures ◽  
Bend Strength ◽  
Temperature Performance ◽  
Ni Content ◽  
Precision Alloys ◽  
Ni Alloy

Abstract Invar is an Fe-Ni alloy with 36% Ni content that exhibits the lowest expansion of known metals from very low temperatures up to approximately 230 deg C (445 deg F). Invar M93 is a cryogenic Invar with improved weldability. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear and bend strength as well as fracture toughness and fatigue. It also includes information on low temperature performance as well as forming and joining. Filing Code: FE-143. Producer or source: Metalimphy Precision Alloys.

Poly(aniline-co-pyrrole)-coated Ni-doped manganese dioxide as electrode materials for supercapacitors

2020 ◽  
Vol 13 (02) ◽  
pp. 2051007
Author(s):  
Jie Dong ◽  
Qinghao Yang ◽  
Qiuli Zhao ◽  
Zhenzhong Hou ◽  
Yue Zhou ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Cycle Stability ◽  
Mass Ratio ◽  
Scan Rate ◽  
Poly Aniline ◽  
Inorganic And Organic

Electrode materials with a high specific capacitance, outstanding reversibility and excellent cycle stability are constantly pursued for supercapacitors. In this paper, we present an approach to improve the electrochemical performance by combining the advantages of both inorganic and organic. Ni-MnO2/PANi-co-PPy composites are synthesized, with the copolymer of aniline/pyrrole being coated on the surface of Ni-doped manganese dioxide nanospheres. The inorganic–organic composite enables a substantial increase in its specific capacitance and cycle stability. When the mass ratio of Ni-MnO2 to aniline and pyrrole mixed monomer is 1:5, the composite delivers high specific capacitance of 445.49[Formula: see text]F/g at a scan rate of 2[Formula: see text]mV/s and excellent cycle stability of 61.65% retention after 5000 cycles. The results indicate that the Ni-MnO2/PANi-co-PPy composites are promising electrode materials for future supercapacitors application.

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