scholarly journals Flower-Like Nanostructured ZnCo2O4/RuO2 Electrode Materials for High Performance Asymmetric Supercapacitors

2021 ◽  
Author(s):  
jinjin wang ◽  
Tianfeng Ye ◽  
Yanqun Shao ◽  
zhiyuan lu ◽  
yuting lin ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Electrode Materials ◽  
Rate Capability ◽  
High Rate ◽  
Density Of State ◽  
Asymmetric Supercapacitors ◽  
Redox Active ◽  
First Time

Abstract RuO2 is well known to be an active and expensive metal oxide. In the paper, ZnCo2O4/RuO2 nanocomposites had been synthesized by simple hydrothermal, impregnation and calcination methods. Due to the multifunctional bridge structure, RuO2 could not only effectively inhibit the volume change of ZnCo2O4 in long-term work but also provide more redox active sites. The forbidden bandwidth was reduced and the conductivity was improved after doping RuO2. Comparing with ZnCo2O4, the density of state of ZnCo2O4/RuO2 tended to a higher energy level. ZnCo2O4/3wt% RuO2 electrode exhibited the excellent specific capacitance (1346.56 F g−1), high rate capability and cyclic stability in 6 M KOH aqueous solution. For the first time, the electrochemical performance of ZnCo2O4/RuO2//IrO2-ZnO ASC has been evaluated in two-electrode configurations. The supercapacitor exhibited an excellent energy density of 40.89 W h kg-1 at the power density of 740 W kg-1 and a high capacitance retention of 87.5 % even after 7000 cycles at a scanning rate of 100 mV s-1. The ZnCo2O4/RuO2 was a promising electrode material for supercapacitors.

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

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.

Fast lithium-ion storage of Nb2O5 nanocrystals in situ grown on carbon nanotubes for high-performance asymmetric supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 41179-41185 ◽  
Author(s):  
Xiaolei Wang ◽  
Ge Li ◽  
Ricky Tjandra ◽  
Xingye Fan ◽  
Xingcheng Xiao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Energy ◽  
Asymmetric Supercapacitors ◽  
Ion Storage ◽  
Energy And Power Density

Nanocomposites of Nb2O5 NCs in situ grown on CNTs are successfully developed with excellent rate capability, leading to the successful fabrication of asymmetric supercapacitors with high energy and power density and long-term cycling stability.

Mesoporous Li4Ti5O12 nanoclusters anchored on super-aligned carbon nanotubes as high performance electrodes for lithium ion batteries

Nanoscale ◽  
2016 ◽  
Vol 8 (1) ◽  
pp. 617-625 ◽  
Author(s):  
Li Sun ◽  
Weibang Kong ◽  
Hengcai Wu ◽  
Yang Wu ◽  
Datao Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Rate Capability ◽  
Lithium Ion ◽  
Lithium Titanate ◽  
High Rate ◽  
High Rate Capability ◽  
Aligned Carbon Nanotubes ◽  
Carbon Nanotube Network ◽  
Binder Free

A binder-free composite anode constructed by anchoring mesoporous lithium titanate nanoclusters in a carbon nanotube network exhibits high capacities, long-term cyclic stability, and excellent high-rate capability.

scholarly journals Boosting High-Rate Zinc-Storage Performance by the Rational Design of Mn2O3 Nanoporous Architecture Cathode

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Danyang Feng ◽  
Tu-Nan Gao ◽  
Ling Zhang ◽  
Bingkun Guo ◽  
Shuyan Song ◽  
...  
Keyword(s):  
High Performance ◽  
Manganese Oxides ◽  
Rational Design ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Rate Capability ◽  
High Rate ◽  
Pore Sizes ◽  
Storage Performance ◽  
Zinc Storage

AbstractManganese oxides are regarded as one of the most promising cathode materials in rechargeable aqueous Zn-ion batteries (ZIBs) because of the low price and high security. However, the practical application of Mn2O3 in ZIBs is still plagued by the low specific capacity and poor rate capability. Herein, highly crystalline Mn2O3 materials with interconnected mesostructures and controllable pore sizes are obtained via a ligand-assisted self-assembly process and used as high-performance electrode materials for reversible aqueous ZIBs. The coordination degree between Mn2+ and citric acid ligand plays a crucial role in the formation of the mesostructure, and the pore sizes can be easily tuned from 3.2 to 7.3 nm. Ascribed to the unique feature of nanoporous architectures, excellent zinc-storage performance can be achieved in ZIBs during charge/discharge processes. The Mn2O3 electrode exhibits high reversible capacity (233 mAh g−1 at 0.3 A g−1), superior rate capability (162 mAh g−1 retains at 3.08 A g−1) and remarkable cycling durability over 3000 cycles at a high current rate of 3.08 A g−1. Moreover, the corresponding electrode reaction mechanism is studied in depth according to a series of analytical methods. These results suggest that rational design of the nanoporous architecture for electrode materials can effectively improve the battery performance. "Image missing"

Large-scale Co9S8@C hybrids with tunable carbon thickness for high-rate and long-term performances of an aqueous battery

Nanoscale ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 3741-3747 ◽  
Author(s):  
Cuihua An ◽  
Mengying Wang ◽  
Weiqin Li ◽  
Li Xu ◽  
Yijing Wang
Keyword(s):  
Active Sites ◽  
Large Scale ◽  
Electrode Materials ◽  
High Rate ◽  
Rechargeable Battery ◽  
Aqueous Battery ◽  
Stable Structures

To realize high-rate and long-term performances of an aqueous rechargeable battery, the most effective approach is to build electrode materials with more reaction active sites and stable structures.

V−doped T−Nb2O5 toward high−performance Mg2+/Li+ hybrid ion batteries

2021 ◽  
Author(s):  
Huihuang Huang ◽  
Guangyu Zhao ◽  
Xianbo Yu ◽  
Xiaojie Shen ◽  
Ming Wang ◽  
...  
Keyword(s):  
Cathode Materials ◽  
High Performance ◽  
Rate Capability ◽  
Cycling Stability ◽  
High Rate ◽  
High Rate Capability

Developing high−rate capability and long−term cycling stability cathode materials is an unremitting pursuit for the development of Mg2+/Li+ hybrid ion batteries. Herein, V−doped T−Nb2O5 sub−microspheres (labeled as VTNO−x, x =...

Facile Synthesis of TiO2 Microspheres with Super High Rate Performance

2012 ◽  
Vol 573-574 ◽  
pp. 1198-1202
Author(s):  
You Rong Wang ◽  
Peng Chen ◽  
Xian Wang Zhang ◽  
Jia Wang ◽  
Si Qing Cheng
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Rate Capability ◽  
High Rate ◽  
X Ray Diffraction ◽  
Rechargeable Lithium Batteries ◽  
Electrochemical Tests ◽  
High Storage Capacity ◽  
Tio2 Microspheres ◽  
High Rate Performance

The development of new electrode materials with high storage capacity is indispensable for improving rechargeable lithium batteries. Herein, high performance TiO2 microspheres have been fabricated by a facile solvothermal method. The obtained TiO2 microspheres were investigated by the measurements of X-ray diffraction pattern, scanning electronic microscopy, and electrochemical tests. As the rates increase from 1C to 20C, the TiO2 composites display high discharge capacities of 414.6 mAh g-1 for the first cycle at 1 C and 244.6 mAh g-1 at 20 C over 100 cycles. CV experiments indicate that there are two peculiar pairs of cathodic/anodic peaks occurred in the range of 1.0-3.0V, which clearly demonstrates that the structure of the TiO2 microspheres here is quite different from the ordinary anatase TiO2. Excellent rate capability and cycle ability are ascribed presumablely to the unique structure.

scholarly journals Boosting Fast and Stable Potassium-ion Storage by Synergistic Interlayer and Pore-structure Engineering

2020 ◽  
Author(s):  
Deping Li ◽  
Qing Sun ◽  
Yamin Zhang ◽  
Xinyue Dai ◽  
Fengjun Ji ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Electrode Materials ◽  
Rate Capability ◽  
Potassium Ion ◽  
High Rate ◽  
Ex Situ ◽  
Metallic Ions ◽  
Energy Storage Devices ◽  
Ion Storage

<p>Carbon-based material has been regarded as one of the most promising electrode materials for Potassium-ion batteries (PIBs). However, the battery performance based on reported porous carbon electrodes is still unsatisfactory, while the in-depth K-ion storage mechanism remains relatively ambiguous. Herein, we propose a facile “<i>in situ</i> template bubbling” method for synthesizing interlayer tuned hierarchically porous carbon with different metallic ions, which delivers superior K-ion storage performance, especially the rate capability (158.6 mAh g<sup>-1</sup>@10.0 A g<sup>-1</sup>) and high-rate cycling stability (82.8% capacity retention after 2000 cycles at 5.0 A g<sup>-1</sup>). The origin of the excellent rate performance is revealed by the deliberately designed consecutive CV measurements, <i>Ex situ</i> Raman tests, GITT and theoretical simulations. Considering the facile preparation strategy, superior electrochemical performance and insightful mechanism investigations, this work can provide fundamental understandings for high performance PIBs and related energy storage devices like sodium-ion batteries, aluminum-ion batteries, electrochemical capacitors and dual-ion batteries.</p>

Layered-tunnel structured cathode for high performance sodium-ion batteries

2020 ◽  
Vol 13 (04) ◽  
pp. 2051016 ◽  
Author(s):  
Feng Zan ◽  
Yao Yao ◽  
Serguei V. Savilov ◽  
Eugenia Suslova ◽  
Hui Xia
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Rate Capability ◽  
High Energy ◽  
Structure Design ◽  
Sodium Ion ◽  
High Rate ◽  
High Energy Density ◽  
Diffraction Field ◽  
Sodium Ion Batteries

Sodium-ion batteries (SIBs) are promising candidates for large-scale energy storage applications. High-performance cathode material with high-energy density and long cycle life is of great interest. Here, an F-doped Nax[Formula: see text]Fy with layered-tunnel intergrowth structure is synthesized by a facile solid-state reaction method. The microstructure and composition of prepared material was confirmed by X-ray diffraction, field emission scanning electron microscope and transmission electron microscopy. The aim of the structure design is to combine the complementary features of high capacity from P2 phase and excellent structural stability from tunnel phase, as well as to improve rate performance by F doping. When investigated as high-rate and long-life cathode materials for Na-ion batteries, the layered-tunnel intergrowth structure exhibits synergistic effect including high discharge capacity (194.0[Formula: see text]mAh[Formula: see text][Formula: see text]), good rate capability (86[Formula: see text]mAh[Formula: see text][Formula: see text] at 15 C) as well as good cycling stability (81.2% capacity retention after 100 cycles). The as-prepared layered-tunnel intergrowth Nax[Formula: see text]Fy provides new insight into the development of intergrowth electrode materials and their application in rechargeable SIBs.

scholarly journals Boosting Fast and Stable Potassium-ion Storage by Synergistic Interlayer and Pore-structure Engineering

2020 ◽  
Author(s):  
Deping Li ◽  
Qing Sun ◽  
Yamin Zhang ◽  
Xinyue Dai ◽  
Fengjun Ji ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Electrode Materials ◽  
Rate Capability ◽  
Potassium Ion ◽  
High Rate ◽  
Ex Situ ◽  
Metallic Ions ◽  
Energy Storage Devices ◽  
Ion Storage

<p>Carbon-based material has been regarded as one of the most promising electrode materials for Potassium-ion batteries (PIBs). However, the battery performance based on reported porous carbon electrodes is still unsatisfactory, while the in-depth K-ion storage mechanism remains relatively ambiguous. Herein, we propose a facile “<i>in situ</i> template bubbling” method for synthesizing interlayer tuned hierarchically porous carbon with different metallic ions, which delivers superior K-ion storage performance, especially the rate capability (158.6 mAh g<sup>-1</sup>@10.0 A g<sup>-1</sup>) and high-rate cycling stability (82.8% capacity retention after 2000 cycles at 5.0 A g<sup>-1</sup>). The origin of the excellent rate performance is revealed by the deliberately designed consecutive CV measurements, <i>Ex situ</i> Raman tests, GITT and theoretical simulations. Considering the facile preparation strategy, superior electrochemical performance and insightful mechanism investigations, this work can provide fundamental understandings for high performance PIBs and related energy storage devices like sodium-ion batteries, aluminum-ion batteries, electrochemical capacitors and dual-ion batteries.</p>

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