Morphology Controlled Synthesis of Heteroatom-Doped Spherical Porous Carbon Particles Retaining High Specific Capacitance at High Current Density

2021 ◽  
Author(s):  
Ananya Pal ◽  
Susanta Ghosh ◽  
Debdas Singha ◽  
Mahasweta Nandi
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
Porous Carbon ◽  
High Current Density ◽  
High Specific Capacitance ◽  
Controlled Synthesis ◽  
High Current ◽  
Carbon Particles

Preparation of lignite-based activated carbon with high specific capacitance for electrochemical capacitors

2015 ◽  
Vol 08 (04) ◽  
pp. 1550031 ◽  
Author(s):  
Baolin Xing ◽  
Jianliang Cao ◽  
Yan Wang ◽  
Guiyun Yi ◽  
Chuanxiang Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electron Microscope ◽  
Specific Capacitance ◽  
Current Density ◽  
Electrode Materials ◽  
High Current Density ◽  
Electrochemical Capacitors ◽  
High Specific Capacitance ◽  
High Current ◽  
Charge Discharge

A lignite-based activated carbon (LAC) for electrochemical capacitors (ECs) was prepared from high moisture lignite by KOH activation, and the as-prepared sample was characterized by the N 2-sorption, scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) techniques. The electrochemical performances of ECs with activated carbon as electrodes in 3 M KOH aqueous solution were evaluated by constant current charge-discharge and cyclic voltammetry. The LAC exhibits a well-developed surface area of 2581 m2/g, a relative wide pore size distribution of 0.5–10 nm. The ECs with LAC as electrode materials presents a high specific capacitance of 392 F/g at a low current density of 50 mA/g, and still remains 315 F/g even at a high current density of 5 A/g. The residual specific capacitance is as high as 92.9% after 2000 cycles. Compared with the commercial activated carbon (Maxsorb: Commercial product, Kansai, Japan), the LAC based electrode materials shows superior capacitive performance in terms of specific capacitance and charge–discharge performance at the high current density.

Design of Aligned Porous Carbon Films with Single‐Atom Co–N–C Sites for High‐Current‐Density Hydrogen Generation

2021 ◽  
pp. 2103533
Author(s):  
Rui Liu ◽  
Zhichao Gong ◽  
Jianbin Liu ◽  
Juncai Dong ◽  
Jiangwen Liao ◽  
...  
Keyword(s):  
Current Density ◽  
Porous Carbon ◽  
Hydrogen Generation ◽  
High Current Density ◽  
Carbon Films ◽  
Single Atom ◽  
High Current

scholarly journals Hierarchical Porous Carbon Derived from Sichuan Pepper for High-Performance Symmetric Supercapacitor with Decent Rate Capability and Cycling Stability

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 553 ◽  
Author(s):  
Hengshuo Zhang ◽  
Wei Xiao ◽  
Wenjie Zhou ◽  
Shanyong Chen ◽  
Yanhua Zhang
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
High Current Density ◽  
Rate Capability ◽  
Cycling Stability ◽  
Koh Activation ◽  
High Current ◽  
Symmetric Supercapacitor ◽  
Hierarchical Porous

Hierarchical micro-mesoporous carbon (denoted as HPC-2 in this study) was synthesized by pre-carbonization of biomass Sichuan pepper followed by KOH activation. It possessed well-developed porosity with the specific surface area of 1823.1 m2 g−1 and pore volume of 0.906 cm3 g−1, and exhibited impressive supercapacitive behaviors. For example, the largest specific capacitance of HPC-2 was tested to be ca. 171 F g−1 in a three-electrode setup with outstanding rate capability and stable electrochemical property, whose capacitance retention was near 100% after cycling at rather a high current density of 40 A g−1 for up to 10,000 cycles. Furthermore, a two-electrode symmetric supercapacitor cell of HPC-2//HPC-2 was constructed, which delivered the maximum specific capacitance and energy density of ca. 30 F g−1 and 4.2 Wh kg−1, respectively, had prominent rate performance and cycling stability with negligible capacitance decay after repetitive charge/discharge at a high current density of 10 A g−1 for over 10,000 cycles. Such electrochemical properties of HPC-2 in both three- and two-electrode systems are superior or comparable to those of a great number of porous biomass carbon reported previously, hence making it a promising candidate for the development of high-performance energy storage devices.

The Analysis of Mass Transport Phenomena in Micro Porous Layer for High Current Density Operation in PEMFC for Automobile Application

2013 ◽  
Author(s):  
Toshikazu Kotaka ◽  
Koichiro Aotani ◽  
Yuichiro Tabuchi ◽  
Partha Mukherjee
Keyword(s):  
Contact Resistance ◽  
Porous Layer ◽  
Oxygen Transport ◽  
Current Density ◽  
High Current Density ◽  
Transport Phenomena ◽  
Dominant Factor ◽  
High Current ◽  
Micro Structure ◽  
Carbon Particles

Cost reduction is the most important issue for commercialization of Fuel Cell Electric Vehicle (FCEV). High current density operation is one of the solutions for it. In order to realize high current density operation, it is necessary to reduce both of electron and oxygen transport resistance in the porous materials such as gas diffusion layer (GDL) and micro porous layer (MPL). However, the impacts of MPL microstructure on their properties are not fully understood yet compared with GDL because of the necessity of higher spatial resolution. In previous study, the transport analysis on the micro-structure which were visualized by Nano X-ray CT and FIB-SEM were conducted for it. However, it was not enough to understand both of the electron and oxygen transport phenomena and find the dominant factors, because there is no study which focused on the comparison of the numerical and experimental results on both of the electron and oxygen transport. In this study, the comprehensive analysis on both of electron and oxygen transport phenomena in GDL and MPL was conducted with experimental and numerical study based on the three-dimensional (3D) micro structure data. As a result, it was found that pore structure, such as a local porosity and/or tortuosity significantly affected the oxygen transport phenomena. On the other hands, especially in the case of electron transport phenomena in MPL, our results suggested that the dominant factor is not the solid structure such as local solid fraction and/or tortuosity but the contact resistance between carbon particles. This fact revealed that it is effective way to reduce the contact resistance between carbon particles and/or the number of contact points in unit length of a transport path in order to improve electrical transport of MPL.

Low-Temperature Hydrothermal Synthesis and Electrochemical Properties of Birnessit-Type Manganese Dioxide Nanosheets

2013 ◽  
Vol 800 ◽  
pp. 393-397 ◽  
Author(s):  
De Yan ◽  
Ying Liu ◽  
Zhi Guo Wu ◽  
Ren Fu Zhuo ◽  
Jun Wang
Keyword(s):  
Low Temperature ◽  
Current Density ◽  
High Current Density ◽  
Hydrothermal Process ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
High Current ◽  
Cycle Stability ◽  
Good Rate Capability ◽  
A Current

Birnessite MnO2 nanosheets were synthesized by self-limiting deposition of KMnO4 in a facile low-temperature hydrothermal process. The MnO2 electrode exhibits a high specific capacitance of 169 F g-1 at a current density of 0.1 A g-1, good rate capability with a capacitance of 96 F g-1 even at a high current density of 5 A g-1, as well as excellent cycle stability with capacitance retention of 94% at 1 A g-1 after 1,000 cycles.

Nitrogen and phosphorus co-doped cubic ordered mesoporous carbon as a supercapacitor electrode material with extraordinary cyclic stability

2015 ◽  
Vol 3 (35) ◽  
pp. 18001-18009 ◽  
Author(s):  
Tandra Panja ◽  
Dhrubajyoti Bhattacharjya ◽  
Jong-Sung Yu
Keyword(s):  
Specific Capacitance ◽  
Mesoporous Carbon ◽  
High Current Density ◽  
High Specific Capacitance ◽  
Ordered Mesoporous Carbon ◽  
High Current ◽  
Nitrogen And Phosphorus ◽  
Supercapacitor Electrode ◽  
Ordered Mesoporous ◽  
Co Doped

Cubic ordered mesoporous carbon co-doped with N and P shows a high specific capacitance of 210 F g−1 at 1.0 A g−1 and excellent retention of specific capacitance with more than 90% of initial capacitance at a high current density of 10 A g−1 and also for 3000 charge–discharge cycles.

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