scholarly journals Rice Hull-Derived Carbon for Supercapacitors: Towards Sustainable Silicon-Carbon Supercapacitors

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4463
Author(s):  
Changwei Li ◽  
Honglei Chen ◽  
Liqiong Zhang ◽  
Shenghui Jiao ◽  
Huixin Zhang ◽  
...  
Keyword(s):  
High Energy ◽  
High Energy Density ◽  
Rice Hull ◽  
Alkali Activation ◽  
Activation Process ◽  
Biomass Waste ◽  
Thin Walls ◽  
Silicon Carbon ◽  
Potential Applicability ◽  
Optimal Material

A simple and effective mixing carbonization-activation process was developed to prepare rice hull-derived porous Si–carbon materials. The morphologies and pore structures of the materials were controlled effectively without any loading or additions at various carbonization temperatures. The structures of the samples changed from large pores and thick walls after 800 ∘C carbonization to small pores and thin walls after 1000 ∘C carbonization. An additional alkali activation–carbonization process led to coral reef-like structures surrounded by squama in the sample that underwent 900 ∘C carbonization (Act-RH-900). This optimal material (Act-RH-900) had a large specific surface area (768 m2 g−1), relatively stable specific capacitance (150.8 F g−1), high energy density (31.9 Wh kg−1), and high-power density (309.2 w kg−1) at a current density of 0.5 A g−1 in 1 M KOH electrolyte, as well as a good rate performance and high stability (capacitance retention > 87.88% after 5000 cycles). The results indicated that Act-RH-900 is a promising candidate for capacitive applications. This work overcomes the restrictions imposed by the complex internal structure of biomass, implements a simple reaction environment, and broadens the potential applicability of biomass waste in the field of supercapacitors.

A hierarchical porous carbon material from a loofah sponge network for high performance supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42430-42437 ◽  
Author(s):  
Yuting Luan ◽  
Lei Wang ◽  
Shien Guo ◽  
Baojiang Jiang ◽  
Dongdong Zhao ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
High Energy ◽  
High Energy Density ◽  
Porous Carbon Material ◽  
Activation Process ◽  
Hierarchical Porous Carbon ◽  
Porous Carbon Materials ◽  
Loofah Sponge ◽  
Hierarchical Porous

High surface area, hierarchical porous carbon materials were obtained by carbonization and activation process of the loofah sponge. The porous carbon materials with good conductivity exhibit high energy density and power density.

The Effect of KOH Activator Concentration upon the Characteristics of Biomass-Derived Water Hyacinth Process on Lithium-Ion Capacitor

2020 ◽  
Vol 1000 ◽  
pp. 58-66
Author(s):  
Muhammad Luthfi ◽  
Jagad Paduraksa ◽  
Ariono Verdianto ◽  
Yoyok Dwi Setyo Pambudi ◽  
Bambang Priyono ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Water Hyacinth ◽  
Active Material ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Specific Power ◽  
Storage Device ◽  
Activation Process ◽  
Lithium Ion Capacitor

Lithium-ion capacitors (LIC) is believed to be an ideal option in certain application as energy storage device due to its properties either possessing high energy density (four times higher than electrical double-layer capacitor) or having as much power density as a supercapacitor. In this study, a biomass-based activated carbon (WHAC) was prepared by using the water hyacinth plant through the activation process utilizing a chemical activating agent, KOH. The water hyacinth was carbonized at 500 °C for a 1 h holding time with a ramping temperature of 10 °C/min. Then, the LICs electrode is constructed by two different types of electrode, WHAC as the main active material of cathode and lithium titanate oxide (LTO) for the anode. The biomass-derived activated carbon exhibits a high specific surface area of 791.8 m2/g and a high pore volume of 1.13 m3/g. The assembled LiCs shows a reasonable electrochemical performance with a maximum specific capacitance of 1.12 F/g with the highest specific energy of 4.48 Wh/kg and specific power of 34.14 W/kg. This LIC cell is one of the promising candidates for future applications due to its low-cost materials and owns more advantages than typical Lithium-ion Batteries (LIBs).

scholarly journals Fe3O4 Nanoparticles on 3D Porous Carbon Skeleton Derived from Rape Pollen for High-Performance Li-Ion Capacitors

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3355
Author(s):  
Mingshan Sun ◽  
Xinan Chen ◽  
Shutian Tan ◽  
Ying He ◽  
Petr Saha ◽  
...  
Keyword(s):  
Porous Structure ◽  
High Performance ◽  
Solution Method ◽  
Electrode Materials ◽  
Three Dimensional ◽  
High Energy ◽  
Electrochemical Analysis ◽  
High Energy Density ◽  
Biomass Waste ◽  
Li Ion

Herein, a three-dimensional (3D) Fe3O4@C composite with hollow porous structure is prepared by simple solution method and calcination treatment with biomass waste rape pollen (RP) as a carbon source, which is served as an anode of Li-ion capacitor (LIC). The 3D interconnected porous structure and conductive networks facilitate the transfer of ion/electron and accommodate the volume changes of Fe3O4 during the electrochemical reaction process, which leads to the excellent performance of the Fe3O4@C composite electrode. The electrochemical analysis demonstrates that the hybrid LIC fabricated with Fe3O4@C as the anode and activated carbon (AC) as the cathode can operate at a voltage of 4.0 V and exhibit a high energy density of 140.6 Wh kg−1 at 200 W kg−1 (52.8 Wh kg−1 at 10 kW kg−1), along with excellent cycling stability, with a capacity retention of 83.3% over 6000 cycles. Hence, these encouraging results indicate that Fe3O4@C has great potential in developing advanced LICs electrode materials for the next generation of energy storage systems.

Nitrogen-doped porous carbon derived from residuary shaddock peel: a promising and sustainable anode for high energy density asymmetric supercapacitors

2016 ◽  
Vol 4 (2) ◽  
pp. 372-378 ◽  
Author(s):  
Kang Xiao ◽  
Liang-Xin Ding ◽  
Hongbin Chen ◽  
Suqing Wang ◽  
Xihong Lu ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrode Material ◽  
Porous Carbon ◽  
High Energy ◽  
High Energy Density ◽  
High Quality ◽  
Asymmetric Supercapacitors ◽  
Biomass Waste ◽  
Nitrogen Doped

We introduce a strategy to convert crude biomass waste into high quality porous carbon and use it as an electrode material for high energy density asymmetric supercapacitors.

scholarly journals Research on High-Value Utilization of Carbon Derived from Tobacco Waste in Supercapacitors

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1714
Author(s):  
Zhenrui Huang ◽  
Caiyun Qin ◽  
Jun Wang ◽  
Lin Cao ◽  
Zhuwen Ma ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Retention Rate ◽  
High Specific Capacitance ◽  
High Energy ◽  
Good Choice ◽  
High Energy Density ◽  
Koh Activation ◽  
Supercapacitor Electrode ◽  
Biomass Waste

Large quantities of tobacco stalks residues are generated and discarded as crop waste or combusted directly every year. Thus, we need to find an appropriate way to dispose of this type of waste and recycle it. The conversion of biomass waste into electrode materials for supercapacitors is entirely in line with the concept of sustainability and green. In this paper, tobacco-stalk-based, porous activated carbon (TC) was successfully synthesized by high-temperature and high-pressure hydrothermal pre-carbonization and KOH activation. The synthesized TC had a high pore volume and a large surface area of 1875.5 m2 g−1, in which there were many mesopores and interconnected micro-/macropores. The electrochemical test demonstrated that TC-1 could reach a high specific capacitance of up to 356.4 F g−1 at a current density of 0.5 A g−1, which was carried in 6M KOH. Additionally, a symmetrical supercapacitor device was fabricated by using TC-1 as the electrode, which delivered a high energy density up to 10.4 Wh kg−1 at a power density of 300 W kg−1, and excellent long-term cycling stability (92.8% of the initial capacitance retention rate after 5000 cycles). Therefore, TC-1 is considered to be a promising candidate for high-performance supercapacitor electrode materials and is a good choice for converting tobacco biomass waste into a resource.

Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler

TAPPI Journal ◽  
2010 ◽  
Vol 9 (6) ◽  
pp. 24-30 ◽  
Author(s):  
NIKLAS BERGLIN ◽  
PER TOMANI ◽  
HASSAN SALMAN ◽  
SOLVIE HERSTAD SVÄRD ◽  
LARS-ERIK ÅMAND
Keyword(s):  
Circulating Fluidized Bed ◽  
Black Liquor ◽  
Chloride Content ◽  
Pilot Scale ◽  
High Energy ◽  
Kraft Lignin ◽  
High Energy Density ◽  
Alkali Chloride ◽  
Cfb Boiler ◽  
Solid Biofuel

Processes have been developed to produce a solid biofuel with high energy density and low ash content from kraft lignin precipitated from black liquor. Pilot-scale tests of the lignin biofuel were carried out with a 150 kW powder burner and a 12 MW circulating fluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the air flows to reduce swirl. Lignin dried to 10% moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than did wood/bark powder. In the CFB boiler, lignin was easily handled and cofired together with bark. Although the filter cake was broken into smaller pieces and fines, the combustion was not disturbed. When cofiring lignin with bark, the sulfur emission increased compared with bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture also occurred with addition of limestone to the bed. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk.

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