Adsorption and Diffusion of Alkali Metals (Li, Na, and K) on Heteroatom-Doped Monolayer Titanium Disulfide

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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Morphology formation mechanism and electrochemical performance of poly(o-phenylenediamine) based electrode materials

Synthetic Metals ◽

10.1016/j.synthmet.2020.116688 ◽

2021 ◽

Vol 273 ◽

pp. 116688

Author(s):

Haidie Lan ◽

Arzugul Muslim ◽

Mehriban Hojiahmat ◽

Lin Wang ◽

Yu Meng ◽

...

Keyword(s):

Electrochemical Performance ◽

Formation Mechanism ◽

Electrode Materials

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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.

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Investigation on the Mass Distribution and Chemical Compositions of Various Ionic Liquids-Extracted Coal Fragments and Their Effects on the Electrochemical Performance of Coal-Derived Carbon Nanofibers (CCNFs)

Nanomaterials ◽

10.3390/nano11030664 ◽

2021 ◽

Vol 11 (3) ◽

pp. 664

Author(s):

Shuai Tan ◽

Theodore John Kraus ◽

Mitchell Ross Helling ◽

Rudolph Kurtzer Mignon ◽

Franco Basile ◽

...

Keyword(s):

Ionic Liquids ◽

Electrochemical Performance ◽

Carbon Nanofibers ◽

Mass Distribution ◽

Electrode Materials ◽

Gas Chromatography Mass Spectrometry ◽

Electrochemical Performances ◽

Diffusion Resistance ◽

Chemical Compositions ◽

Holistic Understanding

Coal-derived carbon nanofibers (CCNFs) have been recently found to be a promising and low-cost electrode material for high-performance supercapacitors. However, the knowledge gap still exists between holistic understanding of coal precursors derived from different solvents and resulting CCNFs’ properties, prohibiting further optimization of their electrochemical performance. In this paper, assisted by laser desorption/ionization (LDI) and gas chromatography–mass spectrometry (GC–MS) technologies, a systematic study was performed to holistically characterize mass distribution and chemical composition of coal precursors derived from various ionic liquids (ILs) as extractants. Sequentially, X-ray photoelectron spectroscopy (XPS) revealed that the differences in chemical properties of various coal products significantly affected the surface oxygen concentrations and certain species distributions on the CCNFs, which, in turn, determined the electrochemical performances of CCNFs as electrode materials. We report that the CCNF that was produced by an oxygen-rich coal fragment from C6mimCl ionic liquid extraction showed the highest concentrations of quinone and ester groups on the surface. Consequentially, C6mimCl-CCNF achieved the highest specific capacitance and lowest ion diffusion resistance. Finally, a symmetric carbon/carbon supercapacitor fabricated with such CCNF as electrode delivered an energy density of 21.1 Wh/kg at the power density of 0.6 kW/kg, which is comparable to commercial active carbon supercapacitors.

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Self-assembly synthesis of nitrogen-doped mesoporous carbons used as high-performance electrode materials in lithium-ion batteries and supercapacitors

New Journal of Chemistry ◽

10.1039/c7nj02532g ◽

2017 ◽

Vol 41 (21) ◽

pp. 12901-12909 ◽

Cited By ~ 11

Author(s):

Chunfeng Shao ◽

Ziqiang Wang ◽

Errui Wang ◽

Shujun Qiu ◽

Hailiang Chu ◽

...

Keyword(s):

Electrochemical Performance ◽

Lithium Ion Batteries ◽

Self Assembly ◽

High Performance ◽

Electrode Materials ◽

Lithium Ion ◽

Mesoporous Carbons ◽

Nitrogen Doped ◽

First Time ◽

Enhanced Electrochemical Performance

Guanine was, for the first time, used as a nitrogen source during the synthesis of nitrogen-doped porous carbons (NMCs) with enhanced electrochemical performance.

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Highly ordered nanoscale phosphomolybdate-grafted polyaniline/metal hybrid layered structures prepared via secondary sputtering phenomenon as high-performance pseudocapacitor electrodes

Physica Scripta ◽

10.1088/1402-4896/ac45a8 ◽

2021 ◽

Author(s):

Eun Seop Yoon ◽

Bong Gill Choi ◽

Hwan-Jin Jeon

Keyword(s):

Electron Transfer ◽

Aspect Ratio ◽

Electrochemical Performance ◽

High Aspect Ratio ◽

High Performance ◽

Electrode Materials ◽

Rate Capability ◽

High Specific Capacitance ◽

High Rate ◽

Large Area

Abstract The development of energy storage electrode materials is important for enhancing the electrochemical performance of supercapacitors. Despite extensive research on improving electrochemical performance with polymer-based materials, electrode materials with micro/nanostructures are needed for fast and efficient ion and electron transfer. In this work, highly ordered phosphomolybdate (PMoO)-grafted polyaniline (PMoO-PAI) deposited onto Au hole-cylinder nanopillar arrays is developed for high-performance pseudocapacitors. The three-dimensional nanostructured arrays are easily fabricated by secondary sputtering lithography, which has recently gained attention and features a high resolution of 10 nm, a high aspect ratio greater than 20, excellent uniformity/accuracy/precision, and compatibility with large area substrates. These 10nm scale Au nanostructures with a high aspect ratio of ~30 on Au substrates facilitate efficient ion and electron transfer. The resultant PMoO-PAI electrode exhibits outstanding electrochemical performance, including a high specific capacitance of 114 mF/cm2, a high-rate capability of 88%, and excellent long-term stability.

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In-situ encapsulation engineering boosts electrochemical performance of highly graphitized N-doped porous carbon-based copper-cobalt selenides for bifunctional oxygen electrocatalysis

Nanoscale ◽

10.1039/d1nr05125c ◽

2021 ◽

Author(s):

Hang Zhang ◽

Xuemin Wang ◽

Zhengzheng Li ◽

Cui Zhang ◽

Shuangxi Liu

Keyword(s):

Energy Storage ◽

Transition Metal ◽

Electrochemical Performance ◽

Porous Carbon ◽

Electrode Materials ◽

Metal Sulfides ◽

Environment Friendly ◽

Energy Storage Applications ◽

Metal Selenides

Transition-metal selenides are capturing eminence as promising electrode materials for energy storage applications owing to their low electronegativity and environment-friendly compared with metal sulfides/oxides. Herein, a CuCoSe@NC nanocomposite with copper-cobalt...

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Fabrication of nickel-foam-supported layered zinc–cobalt hydroxide nanoflakes for high electrochemical performance in supercapacitors

Chemical Communications ◽

10.1039/c4cc05057f ◽

2014 ◽

Vol 50 (76) ◽

pp. 11188-11191 ◽

Cited By ~ 26

Author(s):

Peng Yuan ◽

Ning Zhang ◽

Dan Zhang ◽

Tao Liu ◽

Limiao Chen ◽

...

Keyword(s):

Electrochemical Performance ◽

Specific Capacitance ◽

Electrode Materials ◽

Solvothermal Method ◽

Nickel Foam ◽

Cycling Stability ◽

Cobalt Hydroxide ◽

Facile Solvothermal Method

Nickel foam supported Zn–Co hydroxide nanoflakes were fabricated by a facile solvothermal method, which exhibited excellent specific capacitance and remarkable cycling stability as electrode materials in supercapacitors.

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