Enhancing Capacitance Performance of Ti3C2Tx MXene as Electrode Materials of Supercapacitor: From Controlled Preparation to Composite Structure Construction

AbstractTi3C2Tx, a novel two-dimensional layer material, is widely used as electrode materials of supercapacitor due to its good metal conductivity, redox reaction active surface, and so on. However, there are many challenges to be addressed which impede Ti3C2Tx obtaining the ideal specific capacitance, such as restacking, re-crushing, and oxidation of titanium. Recently, many advances have been proposed to enhance capacitance performance of Ti3C2Tx. In this review, recent strategies for improving specific capacitance are summarized and compared, for example, film formation, surface modification, and composite method. Furthermore, in order to comprehend the mechanism of those efforts, this review analyzes the energy storage performance in different electrolytes and influencing factors. This review is expected to predict redouble research direction of Ti3C2Tx materials in supercapacitors.

Download Full-text

Nickel Cobalt Hydroxides With Tunable Thin-layer Nanosheets for High-performance Supercapacitor Electrode

10.21203/rs.3.rs-149158/v1 ◽

2021 ◽

Author(s):

Luomeng Zhang ◽

Hui Xia ◽

Shaobo Liu ◽

Yishan Zhou ◽

Yuefeng Zhao ◽

...

Keyword(s):

Thin Layer ◽

Specific Capacitance ◽

Current Density ◽

Layered Double Hydroxides ◽

High Performance ◽

Electrode Materials ◽

Supercapacitor Electrode ◽

Nickel Cobalt ◽

Capacitance Performance ◽

Double Hydroxides

Abstract Layered double hydroxides as typical supercapacitor electrode materials can perform superior energy storage if the structures are well regulated. In this work, a simple one-step hydrothermal method is used to prepare diverse nickel cobalt layered double hydroxides (NiCo-LDHs), in which the different contents of urea are used to synthesize the different nanostructures of NiCo-LDHs. The results show that the decrease in urea content can effectively improve the dispersibility of NiCo-LDHs, adjust the thickness of materials and optimize the internal pore structures, thereby enhancing the capacitance performance of NiCo-LDHs. When the content of urea is reduced from 0.03 g to 0.0075 g under a fixed precursor materials mass ratio of nickel (0.06 g) to cobalt (0.02 g) of 3:1, the prepared sample NiCo-LDH-1 exhibits the thickness of 1.62 nm, and the clear thin-layer nanosheets structures and a large number of surface pores are formed, which is beneficial to the transmission of ions into the electrode material. After being prepared as a supercapacitor electrode, the NiCo-LDH-1 displays an ultra-high specific capacitance of 3982.5 F g-1 under the current density of 1 A g-1, and high capacitance retention above 93.6% after 1000 cycles of charging and discharging at a high current density of 10 A g-1. The excellent electrochemical performance of NiCo-LDH-1 is proved by assembling two-electrode asymmetric supercapacitor with carbon spheres, displaying the specific capacitance of 95 F g-1 at 1 A g-1 and the capacitance retention with 78% over 1000 cycles. As a result, it offers a facile way to control the nanostructure of NiCo-LDHs, confirms the important affection of urea on enhancing capacitive performance for supercapacitor electrode and provides the high possibility for the development of high-performance supercapacitors.

Download Full-text

Maize-like ionic liquid@polyaniline nanocomposites for high performance supercapacitor

e-Polymers ◽

10.1515/epoly-2019-0032 ◽

2019 ◽

Vol 19 (1) ◽

pp. 313-322 ◽

Cited By ~ 1

Author(s):

Honghong Song ◽

Jing Zhang ◽

Pengfei Song ◽

Yubing Xiong

Keyword(s):

Specific Capacitance ◽

High Performance ◽

Electrode Materials ◽

Ammonium Persulfate ◽

Cycling Performance ◽

Electrochemical Performances ◽

Imidazolium Chloride ◽

Alkyl Chains ◽

Capacitance Performance ◽

A New Technique

AbstractIn this study, ionic liquids (IL) containing carboxyl and different alkyl chains were fabricated and used to dope polyaniline (PANI). The results revealed that IL@PANI composites could be facilely obtained via template-free polymerization of aniline using ammonium persulfate as the oxidant. The as-prepared IL@PANI composites were measured by FT-IR, XPS, and SEM. Electrochemical performances of IL@PANI nanocomposites were investigated by cyclic voltammetry and galvanostatic charge/discharge. The results indicate that the alkyl chains of ILs have an important influence on the morphology and capacitance performance of IL@PANI electrode materials. With the shorter alkyl group in ILs, IL@PANI materials presented higher specific capacitance. Especially, 1-vinyl-3-carboxymethyl-imidazolium chloride ([VCMIm]Cl)@PANI composite presented the highest specific capacitance. Cycling performance measurement demonstrated that 82% capacitance retention could be achieved after 1000 cycles in 0.5 M H2SO4 aqueous solution. Therefore, our strategy provides a new technique for PANI nanocomposites with tunable morphology and high performance.

Download Full-text

Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

Nanoscale Research Letters ◽

10.1186/s11671-021-03543-w ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Luomeng Zhang ◽

Hui Xia ◽

Shaobo Liu ◽

Yishan Zhou ◽

Yuefeng Zhao ◽

...

Keyword(s):

Thin Layer ◽

Specific Capacitance ◽

Current Density ◽

Layered Double Hydroxides ◽

High Performance ◽

Electrode Materials ◽

Supercapacitor Electrode ◽

Nickel Cobalt ◽

Capacitance Performance ◽

Double Hydroxides

AbstractLayered double hydroxides as typical supercapacitor electrode materials can exhibit superior energy storage performance if their structures are well regulated. In this work, a simple one-step hydrothermal method is used to prepare diverse nickel–cobalt layered double hydroxides (NiCo-LDHs), in which the different contents of urea are used to regulate the different nanostructures of NiCo-LDHs. The results show that the decrease in urea content can effectively improve the dispersibility, adjust the thickness and optimize the internal pore structures of NiCo-LDHs, thereby enhancing their capacitance performance. When the content of urea is reduced from 0.03 to 0.0075 g under a fixed precursor materials mass ratio of nickel (0.06 g) to cobalt (0.02 g) of 3:1, the prepared sample NiCo-LDH-1 exhibits the thickness of 1.62 nm, and the clear thin-layer nanosheet structures and a large number of surface pores are formed, which is beneficial to the transmission of ions into the electrode material. After being prepared as a supercapacitor electrode, the NiCo-LDH-1 displays an ultra-high specific capacitance of 3982.5 F g−1 under the current density of 1 A g−1 and high capacitance retention above 93.6% after 1000 cycles of charging and discharging at a high current density of 10 A g−1. The excellent electrochemical performance of NiCo-LDH-1 is proved by assembling two-electrode asymmetric supercapacitor with carbon spheres, displaying the specific capacitance of 95 F g−1 at 1 A g−1 with the capacitance retention of 78% over 1000 cycles. The current work offers a facile way to control the nanostructure of NiCo-LDHs, confirms the important affection of urea on enhancing capacitive performance for supercapacitor electrode and provides the high possibility for the development of high-performance supercapacitors.

Download Full-text

Making Waste Profitable: Yak Dung Derived Carbon for High-Performance Supercapacitors

NANO ◽

10.1142/s1793292021500879 ◽

2021 ◽

pp. 2150087

Author(s):

Mao Hu ◽

Jia Xu ◽

Ru Cheng ◽

Wencai Bai ◽

Chenghu Liang ◽

...

Keyword(s):

Specific Capacitance ◽

High Performance ◽

Electrode Materials ◽

Poultry Manure ◽

High Specific Capacitance ◽

Cost Effective ◽

Supercapacitor Electrode ◽

Continuous Increase ◽

Capacitance Performance ◽

Yak Dung

With the continuous increase in the demand for energy storage equipment, it is imperative to develop new electrode materials with high specific capacitance. In this study, yak dung derived carbon materials (N-YD) were prepared by a simple, economical, and effective method, and it was applied as a supercapacitor electrode material. The N-YD-800 material exhibited high nitrogen content, as well as a large number of multipore structures, which were beneficial to improve the capacitance performance. N-YD-800 exhibited an excellent specific capacitance (346.3[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], good rate performance (56.6% from 0.5[Formula: see text]A[Formula: see text]g[Formula: see text] to 10[Formula: see text]A[Formula: see text]g[Formula: see text], and excellent cycling stability (93.3% after 5000 cycles). This study provided a new method for the treatment of livestock and poultry manure resources, affording a cost-effective, easy-to-use carbon source to solve the problem of nonrenewable energy.

Download Full-text

Structures and crystallization of vacuum-deposited amorphous Se and Sb films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100173832 ◽

1990 ◽

Vol 48 (4) ◽

pp. 140-141

Author(s):

Makoto Shiojiri ◽

Toshiyuki Isshiki ◽

Tetsuya Fudaba ◽

Yoshihiro Hirota

Keyword(s):

Monte Carlo ◽

Electron Microscope ◽

Monte Carlo Method ◽

Computer Program ◽

Radial Distribution ◽

Film Formation ◽

Amorphous State ◽

Two Dimensional ◽

Amorphous Films ◽

Binding Condition

In hexagonal Se crystal each atom is covalently bound to two others to form an endless spiral chain, and in Sb crystal each atom to three others to form an extended puckered sheet. Such chains and sheets may be regarded as one- and two- dimensional molecules, respectively. In this paper we investigate the structures in amorphous state of these elements and the crystallization.HRTEM and ED images of vacuum-deposited amorphous Se and Sb films were taken with a JEM-200CX electron microscope (Cs=1.2 mm). The structure models of amorphous films were constructed on a computer by Monte Carlo method. Generated atoms were subsequently deposited on a space of 2 nm×2 nm as they fulfiled the binding condition, to form a film 5 nm thick (Fig. 1a-1c). An improvement on a previous computer program has been made as to realize the actual film formation. Radial distribution fuction (RDF) curves, ED intensities and HRTEM images for the constructed structure models were calculated, and compared with the observed ones.

Download Full-text

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

Functional Materials Letters ◽

10.1142/s1793604720510078 ◽

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.

Download Full-text

Dipole-induced Ohmic contacts between monolayer Janus MoSSe and bulk metals

npj 2D Materials and Applications ◽

10.1038/s41699-021-00253-w ◽

2021 ◽

Vol 5 (1) ◽

Author(s):

Ning Zhao ◽

Udo Schwingenschlögl

Keyword(s):

First Principles ◽

Ohmic Contacts ◽

Electrode Materials ◽

Electronic Device ◽

Two Dimensional ◽

First Principles Calculations ◽

Fermi Level Pinning ◽

Common Electrode ◽

Two Sides ◽

Metallic Electrodes

AbstractUtilizing a two-dimensional material in an electronic device as channel layer inevitably involves the formation of contacts with metallic electrodes. As these contacts can dramatically affect the behavior of the device, we study the electronic properties of monolayer Janus MoSSe in contact with different metallic electrodes by first-principles calculations, focusing on the differences in the characteristics of contacts with the two sides of MoSSe. In particular, we demonstrate that the Fermi level pinning is different for the two sides of MoSSe, with the magnitude resembling that of MoS2 or MoSe2, while both sides can form Ohmic contacts with common electrode materials without any further adaptation, which is an outstanding advantage over MoS2 and MoSe2.

Download Full-text

Effect of redox additive in aqueous electrolyte on the high specific capacitance of cation incorporated MnCo2O4@Ni(OH)2 electrode materials for flexible symmetric supercapacitor

Composites Part B Engineering ◽

10.1016/j.compositesb.2021.108755 ◽

2021 ◽

pp. 108755

Author(s):

Prakas Samanta ◽

Souvik Ghosh ◽

Naresh Chandra Murmu ◽

Tapas Kuila

Keyword(s):

Specific Capacitance ◽

Electrode Materials ◽

Aqueous Electrolyte ◽

High Specific Capacitance ◽

Symmetric Supercapacitor

Download Full-text

A Hierarchical Architecture of Functionalized Polyaniline/Manganese Dioxide Composite with Stable-Enhanced Electrochemical Performance

Journal of Composites Science ◽

10.3390/jcs5050129 ◽

2021 ◽

Vol 5 (5) ◽

pp. 129

Author(s):

Yapeng Wang ◽

Yanxiang Wang ◽

Chengjuan Wang ◽

Yongbo Wang

Keyword(s):

Electrochemical Performance ◽

Manganese Dioxide ◽

Specific Capacitance ◽

Current Density ◽

Electrode Materials ◽

High Efficiency ◽

Scanning Speed ◽

Hierarchical Architecture ◽

Electrochemical Window ◽

A Current

As one of the most outstanding high-efficiency and environmentally friendly energy storage devices, the supercapacitor has received extensive attention across the world. As a member of transition metal oxides widely used in electrode materials, manganese dioxide (MnO2) has a huge development potential due to its excellent theoretical capacitance value and large electrochemical window. In this paper, MnO2 was prepared at different temperatures by a liquid phase precipitation method, and polyaniline/manganese dioxide (PANI/MnO2) composite materials were further prepared in a MnO2 suspension. MnO2 and PANI/MnO2 synthesized at a temperature of 40 °C exhibit the best electrochemical performance. The specific capacitance of the sample MnO2-40 is 254.9 F/g at a scanning speed of 5 mV/s and the specific capacitance is 241.6 F/g at a current density of 1 A/g. The specific capacitance value of the sample PANI/MnO2-40 is 323.7 F/g at a scanning speed of 5 mV/s, and the specific capacitance is 291.7 F/g at a current density of 1 A/g, and both of them are higher than the specific capacitance value of MnO2. This is because the δ-MnO2 synthesized at 40 °C has a layered structure, which has a large specific surface area and can accommodate enough electrolyte ions to participate the electrochemical reaction, thus providing sufficient specific capacitance.

Download Full-text