A biomass carbon material with microtubule bundling and natural O-doping derived from goldenberry calyx and its electrochemical performance in supercapacitor

2020 ◽  
Vol 31 (3) ◽  
pp. 805-808 ◽  
Author(s):  
Yang Liu ◽  
Mengyi Zhang ◽  
Liqiu Wang ◽  
Yajuan Hou ◽  
Chenxiao Guo ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Carbon Material ◽  
Biomass Carbon

N, S Co-Doped Bagasse Mesoporous Carbon with Enhanced Electrochemical Performance

2021 ◽  
Vol 16 (7) ◽  
pp. 1161-1174
Author(s):  
Shuang Zheng ◽  
Huigen Liu ◽  
Dongliang Liao ◽  
Yuan Luo ◽  
Guobin Hu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Surface Area ◽  
Reversible Capacity ◽  
Mesoporous Structure ◽  
Bet Surface Area ◽  
Biomass Carbon ◽  
Co Doping ◽  
Study Results ◽  
One Step ◽  
Co Doped

Nitrogen-sulfur co-doped interconnected honeycomb sheet-like biomass carbon (N, S-BC) from low-cost agriculture waste-bagasse, was prepared by a simple and effective strategy of one step heat treatment with thiourea as doping agent. The mesoporous structure of N, S-BC shows an average pore diameter of 6–25 nm, a sheet thickness of 5–7 nm, and a relatively large BET surface area of 1576.7 m2 g−1. The N, S-BC anode material exhibits better electrochemical performance than the un-doped BC and the N, S single-doped BC (N-BC and S-BC). The N, S-co-doping makes the first discharge specific capacity of BC increase 105.9%, the first coulomb efficiency increase 22.8%, and the reversible capacity increase 187.2% after 50 cycles. After 200 cycles, A relatively high reversible capacity of 572.8 mAh g−1 even can be observed at a high current density of 2 A g−1, which is 3.7 times that of BC and almost twice that of N-BC and S-BC. When using as LEDs lighting power supply, the brightness duration of N, S-BC cell shows longer than that of BC cell. The dynamic storage mechanism study results show that both the diffusion coefficient of lithium ions and capacitance contribution rate of N, S-BC are larger than those of BC. These enhanced electrochemical properties of N, S-BC are attributed to their high specific surface area, abundant uniform mesoporous structure of the honeycomb layer and defects, and the synergistic effect of diatomic doping. The one-step method of N, S co-doping technology for sheet-like porous biomass carbon could be used to synthesize high-performance lithium-ion battery electrode materials with cheap and readily available agricultural waste is used as precursors.

scholarly journals Temperature Distribution Estimation in a Dwight–Lloyd Sinter Machine Based on the Combustion Rate of Charcoal Quasi-Particles

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 406
Author(s):  
Ziming Wang ◽  
Ko-ichiro Ohno ◽  
Shunsuke Nonaka ◽  
Takayuki Maeda ◽  
Kazuya Kunitomo
Keyword(s):  
Combustion Rate ◽  
Carbon Material ◽  
Iron Ore ◽  
Sinter Machine ◽  
Alumina Powder ◽  
Biomass Carbon ◽  
Sintering Process ◽  
Experimental Conditions ◽  
Iron Ore Sintering ◽  
Iron Ore Sintering Process

The coke combustion rate in an iron ore sintering process is one of the most important determining factors of quality and productivity. Biomass carbon material is considered to be a coke substitute with a lower CO2 emission in the sintering process. The purpose of this study was to investigate the combustion rate of a biomass carbon material and to use a sintering simulation model to calculate its temperature profile. The samples were prepared using alumina powder and woody biomass powder. To simplify the experimental conditions, alumina powder, which cannot be reduced, was prepared as a substitute of iron ore. Combustion experiments were carried out in the open at 1073 K~1523 K. The results show that the combustion rates of the biomass carbon material were higher than that of coke. The results were analyzed using an unreacted core model with one reaction interface. The kinetic analysis found that the kc of charcoal was higher than that of coke. It is believed that the larger surface area of charcoal may affect its combustion rate. The analysis of the sintering simulation results shows that the high temperature range of charcoal was smaller than that of coke because of charcoal’s low fixed carbon content and density.

Activated Carbon/MnO2 Composites as Electrode for High Performance Supercapacitors

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 256 ◽  
Author(s):  
Jang Rak Choi ◽  
Ji Won Lee ◽  
Guijun Yang ◽  
Young-Jung Heo ◽  
Soo-Jin Park
Keyword(s):  
Composite Material ◽  
Activated Carbon ◽  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Carbon Material ◽  
High Performance ◽  
Cycle Performance ◽  
Stable Cycle ◽  
Hydrothermal Approach

Activated carbon (AC) was synthesized with various weight ratios of manganese dioxide (MO) through a simple hydrothermal approach. The electrochemical performance of the synthesized activated carbon/MnO2 composites was investigated. The effect of the activated carbon/MnO2 (AM) ratio on the electrochemical properties of the activated carbon/MnO2 composites and the pore structure was also examined. The results show that the specific capacitance of the activated carbon material has been improved after the addition of MO. The as-synthesized composite material exhibits specific capacitance of 60.3 F g−1 at 1 A g−1, as well as stable cycle performance and 99.6% capacitance retention over 5000 cycles.

In-Situ Dual Growth of Graphitic Structures in Biomass Carbon as Potassium-ion Batteries Anode with High Initial Coulombic Efficiency

2021 ◽  
Author(s):  
Zheren Tang ◽  
Yan Wang ◽  
Zheng Zheng ◽  
Xingzhang Luo
Keyword(s):  
Carbon Material ◽  
Coulombic Efficiency ◽  
Potassium Ion ◽  
Biomass Carbon ◽  
Good Potential ◽  
Initial Coulombic Efficiency

Biomass carbon material has a good potential as an anode for potassium-ion batteries (KIBs). However, it suffers from a low initial Coulombic efficiency (ICE), which hinders its mass adoption. The...

Preparation of Porous Carbon Material Derived from Cellulose with Added Melamine Sulfate and Electrochemical Performance as EDLC Electrode

2018 ◽  
Vol 48 (2) ◽  
pp. 879-886 ◽  
Author(s):  
Toshiki Tsubota ◽  
Yuta Maguchi ◽  
Kotaro Ishimoto ◽  
Yuki Katamune ◽  
Sunao Kamimura ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Porous Carbon ◽  
Carbon Material ◽  
Porous Carbon Material

scholarly journals Accumulation charge mechanisms in electrochemical systems formed based on activated carbon and manganese oxide

2020 ◽  
Vol 21 (1) ◽  
pp. 27-34
Author(s):  
B. K. Ostafiychuk ◽  
M. I. Kolkovskyi ◽  
B. I. Rachiy ◽  
P. I. Kolkovskyi ◽  
N. Ya. Ivanichok ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Activated Carbon ◽  
Electrochemical Performance ◽  
Porous Structure ◽  
Manganese Oxide ◽  
Specific Capacitance ◽  
Crystalline Structure ◽  
Carbon Material ◽  
Asymmetric Supercapacitors ◽  
Electrochemical Systems

In this work, the porous structure of the carbon material and the crystalline structure of manganese oxide α - modification (α - MnO2) have been investigated. The electrochemical performance of symmetric and asymmetric supercapacitors (α - MnO2 / Activated carbon) was investigated by cyclic voltammetry and galvanostatic cycling methods. The processes occur mainly at the electrode – electrolyte interface have been analyzed. It was determined that at discharge currents of 0.5 - 5 mA, the specific capacitance value for the α - MnO2 / Activated carbon hybrid capacitor exceeds the value of the symmetric capacitor by 45 - 55 % under the same conditions.

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