scholarly journals Supercapacitors Based on Nickel Oxide/Carbon Materials Composites

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Katarzyna Lota ◽  
Agnieszka Sierczynska ◽  
Grzegorz Lota
Keyword(s):  
Nickel Oxide ◽  
Active Carbon ◽  
Electrode Materials ◽  
Carbon Materials ◽  
Negative Electrode ◽  
Electrochemical Capacitor ◽  
Carbon Composite ◽  
Electrochemical Performances ◽  
Composite Electrodes ◽  
Asymmetric Configuration

In the thesis, the properties of nickel oxide/active carbon composites as the electrode materials for supercapacitors are discussed. Composites with a different proportion of nickel oxide/carbon materials were prepared. A nickel oxide/carbon composite was prepared by chemically precipitating nickel hydroxide on an active carbon and heating the hydroxide at 300 ∘Cin the air. Phase compositions of the products were characterized using X-ray diffractometry (XRD). The morphology of the composites was observed by SEM. The electrochemical performances of composite electrodes used in electrochemical capacitors were studied in addition to the properties of electrode consisting of separate active carbon and nickel oxide only. The electrochemical measurements were carried out using cyclic voltammetry, galvanostatic charge/discharge, and impedance spectroscopy. The composites were tested in 6 M KOH aqueous electrolyte using two- and three-electrode Swagelok systems. The results showed that adding only a few percent of nickel oxide to active carbon provided the highest value of capacity. It is the confirmation of the fact that such an amount of nickel oxide is optimal to take advantage of both components of the composite, which additionally can be a good solution as a negative electrode in asymmetric configuration of electrode materials in an electrochemical capacitor.

LiFePO4 - Activated Carbon Composite Electrode as Symmetrical Electrochemical Capacitor in Mild Aqueous Electrolyte

2014 ◽  
Vol 627 ◽  
pp. 3-6 ◽  
Author(s):  
M.Y. Ho ◽  
Poi Sim Khiew ◽  
D. Isa ◽  
T.K. Tan ◽  
W.S. Chiu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Low Cost ◽  
Electrochemical Capacitor ◽  
Carbon Composite ◽  
Electrochemical Performances ◽  
Composite Electrodes ◽  
Capacitive Performance

In this study, a symmetric electrochemical capacitor has been fabricated by adopting the lithiated compound (LiFePO4)-activated carbon (AC) composite as the core electrode materials. The electrochemical performances of the prepared supercapacitor were studied using cyclic voltammetry (CV) in 1.0 M Na2SO3 solution. Experimental results reveal that the maximum specific capacitance of 112.41 F/g is obtained in 40 wt % LiFePO4 loading on AC electrode in comparison to that of pure AC electrode (76.24 F/g) in 1 M Na2SO3. The enhanced capacitive performance of the 40 wt % LiFeO4 –AC composite electrode is believed attributed to the contribution of synergistic effect of electric double layer capacitance (EDLC) on the surface of AC as well as pseudocapacitance via intercalation/extraction of Na+, SO32-and Li+ ions in LiFePO4 lattices. The composite electrodes can sustain a stable capacitive performance at least 1000 cycles with only ~5 % specific capacitance loss after 1000 cycles. Based on the findings above, 40 wt % LiFeO4 –AC composite electrodes which utilise low cost materials and environmental friendly electrolyte is worth being investigated in more details.

ELECTROCHEMICAL BEHAVIOR OF AMORPHOUS HYDROUS RUTHENIUM OXIDE/ACTIVE CARBON COMPOSITE ELECTRODES FOR SUPER-CAPACITOR

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4479-4483 ◽  
Author(s):  
JIAN-RONG ZHANG ◽  
BIN CHEN ◽  
WEI-KUAN LI ◽  
JUN-JIE ZHU ◽  
LI-PING JIANG
Keyword(s):  
Active Carbon ◽  
Electrochemical Behavior ◽  
Sol Gel ◽  
Ruthenium Oxide ◽  
Carbon Composite ◽  
Electrochemical Characteristics ◽  
Composite Electrodes ◽  
Super Capacitor ◽  
A Value ◽  
Sol Gel Process

The RuO 2· xH 2 O/C composites were prepared directly based on a sol-gel process under ultrasonic wave (50Hz). The specific capacitance of pure RuO 2· xH 2 O materials obtained by the method reached a value of 760F/g. Physical properties of the material and electrochemical characteristics of electrodes were described.

scholarly journals Three-Dimensional Porous Ti3C2Tx-NiO Composite Electrodes with Enhanced Electrochemical Performance for Supercapacitors

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 188 ◽  
Author(s):  
Kaicheng Zhang ◽  
Guobing Ying ◽  
Lu Liu ◽  
Fengchen Ma ◽  
Lin Su ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Freeze Drying ◽  
Three Dimensional ◽  
Electrochemical Capacitor ◽  
Cycling Performance ◽  
Composite Electrodes ◽  
Growth Trend ◽  
Porous Networks ◽  
Dimensional Network ◽  
Enhanced Electrochemical Performance

Ti3C2Tx and Ti3C2Tx-NiO composites with three-dimensional (3D) porous networks were successfully fabricated via vacuum freeze-drying. The microstructure, absorption, and electrochemical properties of the developed composites were investigated. Nickel oxide (NiO) nanoparticles could be evenly distributed on the three-dimensional network of three-dimensional Ti3C2Tx using solution processing. When employed as electrochemical capacitor electrodes in 1 M environmentally friendly sodium sulfate, Na2SO4, solution, the three-dimensional porous Ti3C2Tx-NiO composite electrodes exhibited considerable volume specific capacitance as compared to three-dimensional porous Ti3C2Tx. The three-dimensional porous Ti3C2Tx-NiO composite delivered a remarkable cycling performance with a capacitance retention of up to 114% over 2500 cycles. The growth trend of the capacitance with NiO content shows that nickel oxide plays a crucial role in the composite electrodes. These results present a roadmap for the development of convenient and economical supercapacitors in consideration with the possibilities of morphological control and the extensibility of the process.

Synthesis of Tin Oxide/Sponge Carbon Composite as Anode Material for Lithium-Ion Battery

2021 ◽  
Vol 21 (3) ◽  
pp. 1493-1499
Author(s):  
Shugui Quan ◽  
Chuanqi Feng ◽  
Yao Xiao
Keyword(s):  
Lithium Ion Battery ◽  
Tin Oxide ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Carbon Composite ◽  
Future Application ◽  
Solvothermal Reaction ◽  
Electrochemical Performances ◽  
Rate Performance

Tin oxide/sponge carbon composite (SnO2/C) is synthesized by solvothermal reaction. The expected electrode materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectrum. Related electrochemical properties are carried out by battery comprehensive testing system. The composite could remain its specific capacity at 660.5 mAh g−1 after 200 cycles and behaved superior rate performance. The experimental results show that SnO2/C composite not only owned improved conductivity but also stable frame structure during lithiation/delithiation processes. So SnO2/C composite behaved higher reversible specific capacity and rate performance than those of pure SnO2 or SnC2O4. Based on its outstanding electrochemical performances, the SnO2/C anode electrode is a hopeful candidate for future application in lithium ion battery system.

A REVIEW OF METAL OXIDE COMPOSITE ELECTRODE MATERIALS FOR ELECTROCHEMICAL CAPACITORS

NANO ◽  
2014 ◽  
Vol 09 (06) ◽  
pp. 1430002 ◽  
Author(s):  
M. Y. HO ◽  
P. S. KHIEW ◽  
D. ISA ◽  
T. K. TAN ◽  
W. S. CHIU ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Low Cost ◽  
Electrochemical Capacitors ◽  
High Energy ◽  
Electrochemical Performances ◽  
Composite Electrodes ◽  
Lithium Metal ◽  
Oxide Composite

With the emerging technology in the 21st century, which requires higher electrochemical performances, metal oxide composite electrodes in particular offer complementary properties of individual materials via the incorporation of both physical and chemical charge storage mechanism together in a single electrode. Numerous works reviewed herein have identified a wide variety of attractive metal oxide-based composite electrode material for symmetric and asymmetric electrochemical capacitors. The focus of the review is the detailed literature data and discussion regarding the electrochemical performance of various metal oxide composite electrodes fabricated from different configurations including binary and ternary composites. Additionally, projection of future development in hybrid capacitor coupling lithium metal oxides and carbonaceous materials are found to obtain significantly higher energy storage than currently available commercial electrochemical capacitors. This review describes the novel concept of lithium metal oxide electrode materials which are of value to researchers in developing high-energy and enhanced-cyclability electrochemical capacitors comparable to Li -ion batteries. In order to fully exploit the potential of metal oxide composite electrode materials, developing low cost, environment-friendly nanocomposite electrodes is certainly a research direction that should be extensively investigated in the future.

scholarly journals The Principle of Introducing Halogen Ions Into β-FeOOH: Controlling Electronic Structure and Electrochemical Performance

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Dongbin Zhang ◽  
Xuzhao Han ◽  
Xianggui Kong ◽  
Fazhi Zhang ◽  
Xiaodong Lei
Keyword(s):  
Electronic Structure ◽  
Design Principle ◽  
Electrode Materials ◽  
Theoretical Calculations ◽  
Specific Capacity ◽  
Negative Electrode ◽  
Electrochemical Performances ◽  
Host Materials ◽  
Rate Capacity ◽  
High Valence State

AbstractCoordination tuning electronic structure of host materials is a quite effective strategy for activating and improving the intrinsic properties. Herein, halogen anion (X−)-incorporated β-FeOOH (β-FeOOH(X), X = F−, Cl−, and Br−) was investigated with a spontaneous adsorption process, which realized a great improvement of supercapacitor performances by adjusting the coordination geometry. Experiments coupled with theoretical calculations demonstrated that the change of Fe–O bond length and structural distortion of β-FeOOH, which is rooted in halogen ions embedment, led to the relatively narrow band gap. Because of the strong electronegativity of X−, the Fe element in β-FeOOH(X)s presented the unexpected high valence state (3 + δ), which is facilitating to adsorb SO32− species. Consequently, the designed β-FeOOH(X)s exhibited the good electric conductivity and enhanced the contact between electrode and electrolyte. When used as a negative electrode, the β-FeOOH(F) showed the excellent specific capacity of 391.9 F g−1 at 1 A g−1 current density, almost tenfold improvement compared with initial β-FeOOH, with the superior rate capacity and cyclic stability. This combinational design principle of electronic structure and electrochemical performances provides a promising way to develop advanced electrode materials for supercapacitor.

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