scholarly journals Porous SnO2 nanostructure with a high specific surface area for improved electrochemical performance

RSC Advances ◽  
2020 ◽  
Vol 10 (18) ◽  
pp. 10519-10525 ◽  
Author(s):  
Hyeona Kim ◽  
Min-Cheol Kim ◽  
Sung-beom Kim ◽  
Yo-Seob Kim ◽  
Jin-Hyeok Choi ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Material ◽  
High Specific Surface Area ◽  
Anode Active Material ◽  
Sno2 Nanostructure

A porous SnO2 nanostructure as an anode active material showed significantly improved electrochemical performance.

scholarly journals Synthesis of Honeycomb-like Co3O4 Nanosheets with Excellent Supercapacitive Performance by morphological controlling derived from the alkaline source ratio

2018 ◽  
Author(s):  
Wanli Jia ◽  
Jun Li ◽  
Zhongjie Lu ◽  
Yongfei Juan ◽  
Yunqiang Jiang
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Morphological Evolution ◽  
High Specific Surface Area ◽  
Galvanostatic Charge ◽  
X Ray ◽  
Charge Discharge ◽  
Discharge Test

Honeycomb-like CO3O4 nanosheets with high specific surface area were successfully synthesized on porous nickel foam by the facile hydrothermal method followed by an annealing treatment (300 °C), which were used as high-performance supercapacitor electrodes. The effects of mole ratio of hexamethylenetetramine (HMT) and Co(NO3)2 (1:1, 2:1, 3:1, 4:1, 5:1 and 6:1）as the reactants on morphological evolution and electrochemical performance of the electrodes were investigated in detail. X-ray diffractometry, transmission electron microscopy, X-ray photoelectron spectroscopy and scanning electron microscopy were applied to characterize the structure and morphology of the products. The electrochemical performance was measured by cyclic voltammetry (CV) and galvanostatic charge/discharge. The results indicated that phase constituents were almost unaffected with the change in mole ratio of HMT and Co(NO3)2. However, the significant morphological evolution of Co3O4 was observed with increasing the mole ratio, which was described as followed: the nanosheets accompanied with a large number of spherical nanoparticles→the formation of some strip-like particles due to the agglomeration of spherical nanoparticles→the formation of new nanosheets resulting from the growth of strip-like particles→the formation of coarse flower-like particles owing to the connection among the nanosheets→the nanosheets gradually covered with flower-like particles. Accompanied with the change, the specific surface area was increased firstly, and then decreased. A maximum was obtained in the HMT and Co(NO3)2 mole ratio of 4:1, which was further validated by CV and galvanostatic charge/discharge tests. The specific capacitance value was 743.00 F·g-1 at 1 A·g-1 in the galvanostatic charge/discharge test, which was apparently higher than those in the other mole ratios (139.11 F·g-1 in 1:1, 280.46 F·g-1 in 2:1, 503.29 F·g-1 in 3:1, 463.75 F·g-1 in 5:1 and 363.74 F·g-1 in 6:1). The change was also observed in the CV test with a scanning rate of 5 mV·s-1 (121.32 F·g-1 in 1:1, 217.33 F·g-1 in 2:1, 559.86 F·g-1 in 3:1, 693.56 F·g-1 in 4:1, 423.35 F·g-1 in 5:1 and 321.64 F·g-1 in 6:1). Co3O4 synthesized in the mole ratio of 4:1 also demonstrated an excellent cyclic performance, in which about 97% of the initial specific capacitance was remained at 1 A·g-1 for 500 cycles in the galvanostatic charge/discharge test. This excellent electrochemical performance was ascribed to high specific surface area of Co3O4 nanosheets that provide enough channels and space for ions transportion.

scholarly journals Nitrogen and oxygen Co-doped porous carbon derived from yam waste for high-performance supercapacitors

RSC Advances ◽  
2021 ◽  
Vol 11 (53) ◽  
pp. 33208-33218
Author(s):  
Zhaojin Li ◽  
Qian Liu ◽  
Lizhi Sun ◽  
Ning Li ◽  
Xiaofeng Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Porous Carbon ◽  
High Performance ◽  
High Specific Surface Area ◽  
Raw Material ◽  
Excellent Electrochemical Performance ◽  
Co Doped

3D porous carbon with ultra-high specific surface area and excellent electrochemical performance is synthesized by a simple activation and carbonization process through adopting biomass yam waste as raw material.

Effect of Morphology of ZnCo2O4 Nanostructures on Electrochemical Performance

NANO ◽  
2016 ◽  
Vol 11 (08) ◽  
pp. 1650089 ◽  
Author(s):  
J. Y. Dong ◽  
N. Zhang ◽  
S. Y. Lin ◽  
T. T. Chen ◽  
M. Y. Zhang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Hydrothermal Method ◽  
Surface Area ◽  
Specific Surface Area ◽  
Nickel Foam ◽  
High Specific Surface Area ◽  
Active Materials

The ZnCo2O4 nanorods and nanosheets were grown on nickel foam by a facile and effective hydrothermal method, respectively. The effect of the morphologies of the nanostructures on electrochemical performance was investigated. Importantly, ZnCo2O4 nanorod electrodes with a high specific surface area exhibited a higher specific capacitance of 2457.4 F g[Formula: see text] at 2 A g[Formula: see text] and remarkable cycling stability with capacitance retention of 97.7% after 1000 cycles, which are superior to those of ZnCo2O4 nanosheet electrodes. Such a result is well explained. The investigation on the electrochemical properties of these two nanostructures as electrodes confirmed that the morphology of active materials has an important impact on electrochemical properties.

Synthesis and electrochemical performance of N-doped carbon aerogels with super-high specific surface area

2013 ◽  
Vol 25 (10) ◽  
pp. 2621-2626 ◽  
Author(s):  
常丽娟 Chang Lijuan ◽  
袁磊 Yuan Lei ◽  
付志兵 Fu Zhibing ◽  
韦建军 Wei Jianjun ◽  
唐永建 Tang Yongjian ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
Carbon Aerogels

A novel NiCo2O4 anode morphology for lithium-ion batteries

2015 ◽  
Vol 3 (22) ◽  
pp. 11970-11975 ◽  
Author(s):  
Tao Li ◽  
Xinhai Li ◽  
Zhixing Wang ◽  
Huajun Guo ◽  
Yan Li
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Lithium Ion Batteries ◽  
Surface Area ◽  
Specific Surface Area ◽  
Anode Materials ◽  
Lithium Ion ◽  
High Specific Surface Area ◽  
Li Ion Batteries ◽  
Li Ion

Wrinkled NiCo2O4 particles with a high specific surface area showed superior electrochemical performance as anode materials for Li-ion batteries.

scholarly journals Nanoporous Quasi-High-Entropy Alloy Microspheres

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 345 ◽  
Author(s):  
Lianzan Yang ◽  
Yongyan Li ◽  
Zhifeng Wang ◽  
Weimin Zhao ◽  
Chunling Qin
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Hierarchical Porous

High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

KCl-assisted activation: Moringa oleifera branch-derived porous carbon for high performance supercapacitor

2021 ◽  
Vol 45 (12) ◽  
pp. 5712-5719
Author(s):  
Yongxiang Zhang ◽  
Peifeng Yu ◽  
Mingtao Zheng ◽  
Yong Xiao ◽  
Hang Hu ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Porous Carbon ◽  
High Performance ◽  
Moringa Oleifera ◽  
High Specific Surface Area ◽  
Porous Carbons

Porous carbons with a high specific surface area (2314–3470 m2 g−1) are prepared via a novel KCl-assisted activation strategy for high-performance supercapacitor.

Carbon material with high specific surface area and high pseudocapacitance: Possible application in supercapacitors

2021 ◽  
Vol 319 ◽  
pp. 111063
Author(s):  
Yury M. Volfkovich ◽  
Valentin E. Sosenkin ◽  
Alexei Y. Rychagov ◽  
Alexandr V. Melezhik ◽  
Alexei G. Tkachev ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Material ◽  
High Specific Surface Area
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