scholarly journals Biomass-Derived Porous Carbons Derived from Soybean Residues for High Performance Solid State Supercapacitors

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4050 ◽  
Author(s):  
Hsiu-Ying Chung ◽  
Guan-Ting Pan ◽  
Zhong-Yun Hong ◽  
Chun-Tsung Hsu ◽  
Siewhui Chong ◽  
...  
Keyword(s):  
Solid State ◽  
Surface Area ◽  
Synergistic Effects ◽  
Chemical Activation ◽  
High Energy ◽  
High Energy Density ◽  
Bet Surface Area ◽  
Electrochemical Performances ◽  
Porous Carbons ◽  
Symmetric Supercapacitor

A series of heteroatom-containing porous carbons with high surface area and hierarchical porosity were successfully prepared by hydrothermal, chemical activation, and carbonization processes from soybean residues. The initial concentration of soybean residues has a significant impact on the textural and surface functional properties of the obtained biomass-derived porous carbons (BDPCs). SRAC5 sample with a BET surface area of 1945 m2 g−1 and a wide micro/mesopore size distribution, nitrogen content of 3.8 at %, and oxygen content of 15.8 at % presents the best electrochemical performance, reaching 489 F g−1 at 1 A g−1 in 6 M LiNO3 aqueous solution. A solid-state symmetric supercapacitor (SSC) device delivers a specific capacitance of 123 F g−1 at 1 A g−1 and a high energy density of 68.2 Wh kg−1 at a power density of 1 kW kg−1 with a wide voltage window of 2.0 V and maintains good cycling stability of 89.9% capacitance retention at 2A g−1 (over 5000 cycles). The outstanding electrochemical performances are ascribed to the synergistic effects of the high specific surface area, appropriate pore distribution, favorable heteroatom functional groups, and suitable electrolyte, which facilitates electrical double-layer and pseudocapacitive mechanisms for power and energy storage, respectively.

scholarly journals Coconut Shell-Derived Activated Carbon for High-Performance Solid-State Supercapacitors

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4546
Author(s):  
Kuan-Ching Lee ◽  
Mitchell Shyan Wei Lim ◽  
Zhong-Yun Hong ◽  
Siewhui Chong ◽  
Timm Joyce Tiong ◽  
...  
Keyword(s):  
Solid State ◽  
Surface Area ◽  
Activated Carbons ◽  
High Energy ◽  
High Energy Density ◽  
Coconut Shell ◽  
Superior Performance ◽  
Bet Surface Area ◽  
Koh Activation ◽  
Symmetric Supercapacitor

Coconut shells, low-cost and renewable agro-wastes, were used as a starting material in the synthesis of hierarchical activated carbons via hydrothermal, KOH-activation, and carbonization techniques. The ratio of KOH to hydrochar was varied in a systemic manner to study how it influences the texture and electrochemical behavior of the capacitor. Coconut shell-based carbon coated on nickel foams presented a surface area of 1567 m2 g−1, with micropores as well as mesopores widely distributed. The sample showed superior electrochemical performance, attaining 449 F g−1 at 1 A g−1 in 6 M LiNO3 aqueous solution. The solid-state symmetric supercapacitor device delivered a specific capacitance of 88 F g−1 at 1 A g−1 and a high energy density of 48.9 Whkg−1 at a power density of 1 kW kg−1. At a wide voltage window of 2.0 V, the sample was highly stable during the cycle test, showing a 92% capacitance retention at 2 A g−1 after cycling for 5000 times. The superior performance is due to the sample possessing great BET surface area, a good distribution of pores, and the usage of a suitable electrolyte. This facilitates an electrical double layer that can be deployed for applications to store energy.

High energy density of quasi-solid-state supercapacitor based on redox-mediated gel polymer electrolyte

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 55225-55232 ◽  
Author(s):  
Kanjun Sun ◽  
Feitian Ran ◽  
Guohu Zhao ◽  
Yanrong Zhu ◽  
Yanping Zheng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Solid State ◽  
Energy Density ◽  
Polymer Electrolyte ◽  
Gel Polymer Electrolyte ◽  
High Energy ◽  
High Energy Density ◽  
Symmetric Supercapacitor

A novel redox-mediated gel polymer (PVA–H2SO4–ARS) is prepared, and a symmetric supercapacitor using the gel polymer as electrolyte and activated carbon as electrode is also assembled.

scholarly journals On the Gas Storage Properties of 3D Porous Carbons Derived from Hyper-Crosslinked Polymers

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 588 ◽  
Author(s):  
Giorgio Gatti ◽  
Mina Errahali ◽  
Lorenzo Tei ◽  
Maurizio Cossi ◽  
Leonardo Marchese
Keyword(s):  
Thermal Treatment ◽  
Surface Area ◽  
Pore Volume ◽  
Chemical Activation ◽  
Chemical Characterization ◽  
Total Pore Volume ◽  
Textural Properties ◽  
Gas Storage ◽  
Bet Surface Area ◽  
Porous Carbons

The preparation of porous carbons by post-synthesis treatment of hypercrosslinked polymers is described, with a careful physico-chemical characterization, to obtain new materials for gas storage and separation. Different procedures, based on chemical and thermal activations, are considered; they include thermal treatment at 380 °C, and chemical activation with KOH followed by thermal treatment at 750 or 800 °C; the resulting materials are carefully characterized in their structural and textural properties. The thermal treatment at temperature below decomposition (380 °C) maintains the polymer structure, removing the side-products of the polymerization entrapped in the pores and improving the textural properties. On the other hand, the carbonization leads to a different material, enhancing both surface area and total pore volume—the textural properties of the final porous carbons are affected by the activation procedure and by the starting polymer. Different chemical activation methods and temperatures lead to different carbons with BET surface area ranging between 2318 and 2975 m2/g and pore volume up to 1.30 cc/g. The wise choice of the carbonization treatment allows the final textural properties to be finely tuned by increasing either the narrow pore fraction or the micro- and mesoporous volume. High pressure gas adsorption measurements of methane, hydrogen, and carbon dioxide of the most promising material are investigated, and the storage capacity for methane is measured and discussed.

Synthesis and Characterization of Green Porous Carbons with Large Surface Area by Two Step Chemical Activation with KOH

2014 ◽  
Vol 67 (4) ◽  
Author(s):  
Noor Shawal Nasri ◽  
Mohammed Jibril ◽  
Muhammad Abbas Ahmad Zaini ◽  
Rahmat Mohsin ◽  
Hamza Usman Dadum ◽  
...  
Keyword(s):  
Surface Area ◽  
Porous Carbon ◽  
Pore Volume ◽  
Potassium Hydroxide ◽  
Chemical Activation ◽  
Bet Surface Area ◽  
Porous Carbons ◽  
Precursor Material ◽  
Proximate And Ultimate Analysis

Porous carbons were synthesized from coconut shell using chemical activation by potassium hydroxide (KOH). N2 adsorption isotherm analysis for BET surface area and pore volume of the synthesized porous carbon were carried out. The Langmuir surface area, BET surface area and pore volume are 1646 m2/g, 1353 m2/g and 0.6 cm3/g, respectively. From the FTIR analysis, hydroxyls, alkenes, carbonyls and aromatics functional groups were identified. The proximate and ultimate analysis shows high percentage of carbon and less ash content which indicates a good precursor material for porous carbon. The carbonization temperature and time were also varied to observe their effect on the yield of char, with carbonization at 7000C for 2 h having highest yield of 32%.

scholarly journals Preparation and Application of Garnet Electrolyte Thin Films: Promise and Challenges

2020 ◽  
pp. 6-22 ◽  
Author(s):  
Xufeng Yan ◽  
Weiqiang Han
Keyword(s):  
Thin Film ◽  
Solid State ◽  
Energy Density ◽  
Solid Electrolyte ◽  
High Energy ◽  
High Energy Density ◽  
Electrochemical Performances ◽  
Safety Property ◽  
Solid State Batteries ◽  
All Solid State Batteries

All-solid-state batteries (ASSBs) have attracted much attention in recent years, due to their high energy density, excellent cycling performance, and superior safety property. As the key factor of all-solid-state batteries, solid electrolyte determines the performance of the batteries. Garnet-typed cubic Li7La3Zr2O12(LLZO) has been reported as the most promising solid electrolyte on the way to ASSBs. Thin film electrolyte could contribute to a higher energy density and a lower resistance in a battery. This short review exhibits the latest efforts on LLZO thin film and discusses the different preparation methods, together with their effects on characteristics and electrochemical performances of the solid electrolyte film.

scholarly journals Fast Microwave Synthesis of Hierarchical Porous Carbons from Waste Palm Boosted by Activated Carbons for Supercapacitors

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 405 ◽  
Author(s):  
Chaozheng Liu ◽  
Weimin Chen ◽  
Shu Hong ◽  
Mingzhu Pan ◽  
Min Jiang ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Electrochemical Performances ◽  
Porous Carbons ◽  
Discharge Performance ◽  
Hierarchical Porous ◽  
Hierarchical Porous Carbons

The synthesis of biomass-derived porous carbons (PCs) for supercapacitors by conventional two-steps method (chemical activation after carbonization) is complicated and time-consuming. In this study, we present a one-step microwave activation strategy to prepare hierarchically PCs from waste palm boosted by activated carbons (ACs). ACs with various specific surface areas (14, 642, and 1344 m2·g−1) were used for the first time to fast absorb microwave energy for converting waste palm into hierarchically PCs, that is, PC1, PC2, and PC3, respectively. The morphological and structural characterizations of PCs were studied. Also, the electrochemical performances of supercapacitors based on PCs as electrodes were further investigated. The results showed that the PC (PC1) boosted by AC with the lowest specific surface area possessed a porous structure (containing micro-, meso-, and macro- pores) with the largest specific surface area (1573 m2·g−1) and the highest micropore volume (0.573 cm3·g−1), as well as the suitable mesoporosity (29.69%). The as-prepared PC1 supercapacitor even in a gel electrolyte (PVA/LiCl) exhibited a high specific capacitance of 226.0 F·g−1 at 0.5 A·g−1 and presented excellent charge-discharge performance with an energy density of 72.3 Wh·kg−1 at a power density of 1.4 kW·kg−1 and 50.0 Wh·kg−1 at 28.8 kW·kg−1. Moreover, this promising method exhibited a simple, rapid, and cost-effective preparation of carbon materials from renewable biomass for energy storage applications.

A high voltage solid state symmetric supercapacitor based on graphene–polyoxometalate hybrid electrodes with a hydroquinone doped hybrid gel-electrolyte

2015 ◽  
Vol 3 (46) ◽  
pp. 23483-23492 ◽  
Author(s):  
Deepak P. Dubal ◽  
Jullieth Suarez-Guevara ◽  
Dino Tonti ◽  
Eduardo Enciso ◽  
Pedro Gomez-Romero
Keyword(s):  
Solid State ◽  
Energy Density ◽  
High Voltage ◽  
High Energy ◽  
Gel Electrolyte ◽  
High Energy Density ◽  
Hybrid Gel ◽  
Symmetric Supercapacitor

Development of high energy density hybrid electrode based on rGO–PMo12 for all-solid state supercapacitors along with actual demonstration of lighting of thirty one LEDs (NEO).

Solid-state electrolytes: Advances and perspectives

2020 ◽  
pp. 2130001
Author(s):  
Linchun He ◽  
Jin An Sam Oh ◽  
Jun Jie Jason Chua ◽  
Henghui Zhou
Keyword(s):  
Solid State ◽  
High Energy ◽  
High Energy Density ◽  
Electrochemical Performances ◽  
Energy Storage Devices ◽  
Ion Migration ◽  
Storage Devices ◽  
Li Ion ◽  
Solid State Electrolytes ◽  
Kinetics Of

All-solid-state Li batteries (ASSLiBs) that use solid-state electrolytes (SSEs) to replace liquid organic electrolytes are considered as promising next-generation energy storage devices because of their wide electrochemical potential windows, high safety, and high energy density. Therefore, ASSLiBs have attracted a lot of attention in recent years. In this review, we focus on the main challenges on the synthesis and the electrochemical properties of the SSEs including (i) crystal structures and modification of kinetics of Li-ion migration through doping technology, (ii) synthesis technologies and its effect on the electrochemical performances of the SSEs, and (iii) ambient condition stability and degration of SSEs. Finally, perspectives of future researches on the SSEs are presented.

scholarly journals In-Situ Annealed Ti3C2Tx MXene Based All-Solid-State Flexible Zn-Ion Hybrid Micro Supercapacitor Array with Enhanced Stability

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
La Li ◽  
Weijia Liu ◽  
Kai Jiang ◽  
Di Chen ◽  
Fengyu Qu ◽  
...  
Keyword(s):  
High Energy ◽  
High Rate ◽  
High Energy Density ◽  
Electrochemical Performances ◽  
Integrated Electronics ◽  
Long Term Stability ◽  
Hybrid Supercapacitors ◽  
Portable Electronics

AbstractZn-ion hybrid supercapacitors (SCs) are considered as promising energy storage owing to their high energy density compared to traditional SCs. How to realize the miniaturization, patterning, and flexibility of the Zn-ion SCs without affecting the electrochemical performances has special meanings for expanding their applications in wearable integrated electronics. Ti3C2Tx cathode with outstanding conductivity, unique lamellar structure and good mechanical flexibility has been demonstrated tremendous potential in the design of Zn-ion SCs, but achieving long cycling stability and high rate stability is still big challenges. Here, we proposed a facile laser writing approach to fabricate patterned Ti3C2Tx-based Zn-ion micro-supercapacitors (MSCs), followed by the in-situ anneal treatment of the assembled MSCs to improve the long-term stability, which exhibits 80% of the capacitance retention even after 50,000 charge/discharge cycles and superior rate stability. The influence of the cathode thickness on the electrochemical performance of the MSCs is also studied. When the thickness reaches 0.851 µm the maximum areal capacitance of 72.02 mF cm−2 at scan rate of 10 mV s−1, which is 1.77 times higher than that with a thickness of 0.329 µm (35.6 mF cm−2). Moreover, the fabricated Ti3C2Tx based Zn-ion MSCs have excellent flexibility, a digital timer can be driven by the single device even under bending state, a flexible LED displayer of “TiC” logo also can be easily lighted by the MSC arrays under twisting, crimping, and winding conditions, demonstrating the scalable fabrication and application of the fabricated MSCs in portable electronics.

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