Increase of γ‐Fe 2 O 3 /CNT composite quantum capacitance by structural design for performance optimization of electrode materials

2020 ◽  
Vol 120 (9) ◽  
Author(s):  
Vladislav V. Shunaev ◽  
Arseni V. Ushakov ◽  
Olga E. Glukhova
Keyword(s):  
Performance Optimization ◽  
Structural Design ◽  
Electrode Materials ◽  
Quantum Capacitance

scholarly journals DFT calculation for the electronic properties and quantum capacitance of pure and doped Zr2CO2 as electrode of supercapacitors

2021 ◽  
Author(s):  
Shuo Xu ◽  
Shi-Jie Wang ◽  
Li Xiao-Hong ◽  
Hong-Ling Cui
Keyword(s):  
Electronic Properties ◽  
Electrode Materials ◽  
Chemical Properties ◽  
Effect Of Temperature ◽  
Quantum Capacitance ◽  
Substitutional Site ◽  
Level Shifts ◽  
Dirac Distribution ◽  
Increasing Temperature ◽  
Physical And Chemical

Defect and doping are effective methods to modulate the physical and chemical properties of materials. In this report, we investigated the structural stability, electronic properties and quantum capacitance (Cdiff) of Zr2CO2 by changing the dopants of Si, Ge, Sn, N, B, S and F in the substitutional site. The doping of F, N, and S atoms makes the system undergo the semiconductor-to-conductor transition, while the doping of Si, Ge, and Sn maintains the semiconductor characteristics. The Cdiff of the doped systems are further explored. The B-doped system can be used as cathode materials, while the systems doped by S, F, N, Sn atoms are promising anode materials of asymmetric supercapacitors, especially for the S-doped system. The improved Cdiff mainly originates from Fermi-level shifts and Fermi-Dirac distribution by the introduction of the dopant. The effect of temperature on Cdiff is further explored. The result indicates that the maximum Cdiff of the studied systems gradually decreases with the increasing temperature. Our investigation can provide useful theoretical basis for designing and developing the ideal electrode materials for supercapacitors.

Nest-like V3O7 self-assembled by porous nanowires as an anode supercapacitor material and its performance optimization through bonding with N-doped carbon

2018 ◽  
Vol 6 (34) ◽  
pp. 16475-16484 ◽  
Author(s):  
Danyang Zhao ◽  
Qiancheng Zhu ◽  
Dejian Chen ◽  
Xi Li ◽  
Ying Yu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Performance Optimization ◽  
Electrode Materials ◽  
Low Cost ◽  
Vanadium Oxides ◽  
Electrochemical Activity ◽  
Great Promise ◽  
Self Assembled

Vanadium oxides (such as V2O5, V2O3 and VO2) hold great promise as electrode materials for energy storage due to their high electrochemical activity, low cost and environmental benignity.

Adsorption of metal atoms on silicene: stability and quantum capacitance of silicene-based electrode materials

2019 ◽  
Vol 21 (8) ◽  
pp. 4276-4285 ◽  
Author(s):  
Q. Xu ◽  
G. M. Yang ◽  
Xiaofeng Fan ◽  
W. T. Zheng
Keyword(s):  
Electrode Materials ◽  
Quantum Capacitance ◽  
Metal Doping ◽  
Vacancy Complex ◽  
Metal Atoms ◽  
Metal Vacancy

Metal-doping with the formation of a metal–vacancy complex results in an obvious increase of silicene's quantum capacitance.

Performance Optimization and Fast Rate Capabilities of Novel Polymer Cathode Materials through Balanced Electronic and Ionic Transport

2021 ◽  
Author(s):  
Cara Gannett ◽  
Brian Peterson ◽  
Luis Melecio-Zambrano ◽  
Colleen Q. Trainor ◽  
Brett Fors ◽  
...  
Keyword(s):  
Electron Transport ◽  
Performance Optimization ◽  
Electrode Materials ◽  
Fast Rate ◽  
Ionic Transport ◽  
Electrical Energy ◽  
Electrical Energy Storage ◽  
New Family ◽  
Storage Technologies ◽  
Fast Ion

The increasing demands for high-power electrical energy storage technologies require the development of new electrode materials and architectures with fast ion and electron transport. Herein, we report a new family...

scholarly journals Aerodynamic Performance of a Coaxial Hex-Rotor MAV in Hover

Aerospace ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 378
Author(s):  
Yao Lei ◽  
Jiading Wang ◽  
Wenjie Yang
Keyword(s):  
Performance Optimization ◽  
Structural Design ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Performance ◽  
Field Analysis ◽  
Test Results ◽  
Compact Structure ◽  
Coaxial Rotor ◽  
Optimum Aerodynamic ◽  
Flow Field Analysis

Micro aerial vehicles (MAVs) usually suffer from several challenges, not least of which are unsatisfactory hover efficiency and limited fly time. This paper discusses the aerodynamic characteristics of a novel Hex-rotor MAV with a coaxial rotor capable of providing higher thrust in a compact structure. To extend the endurance during hover, flow field analysis and aerodynamic performance optimization are conducted by both experiments and numerical simulations with different rotor spacing ratios (i = 0.56, 0.59, 0.63, 0.67, 0.71, 0.77, 0.83, 0.91). The measured parameters are thrust, power, and hover efficiency during the experiments. Retip ranged from 0.7 × 105 to 1.3 × 105 is also studied by Spalart–Allmaras simulations. The test results show that the MAV has the optimum aerodynamic performance at i = 0.56 with Retip = 0.85 × 105. Compared to the MAV with i = 0.98 for Retip = 0.85 × 105, thrust is increased by 5.18% with a reduced power of 3.8%, and hover efficiency is also improved by 12.14%. The simulated results indicate a weakness in inter-rotor interference with the increased rotor spacing. Additionally, the enlarged pressure difference, reduced turbulence, and weakened vortices are responsible for the aerodynamic improvement. This provides an alternative method for increasing the MAV fly time and offers inspiration for future structural design.

Structural design of graphene for use in electrochemical energy storage devices

2015 ◽  
Vol 44 (17) ◽  
pp. 6230-6257 ◽  
Author(s):  
Kunfeng Chen ◽  
Shuyan Song ◽  
Fei Liu ◽  
Dongfeng Xue
Keyword(s):  
Energy Storage ◽  
Structural Design ◽  
High Performance ◽  
Electrode Materials ◽  
Electrochemical Energy Storage ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Design Methodologies ◽  
Electrochemical Energy

This review elucidates the structural design methodologies toward high-performance graphene-based electrode materials for electrochemical energy storage devices.

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