scholarly journals High energy density and extremely stable supercapacitors based on carbon aerogels with 100% capacitance retention up to 65,000 cycles

2021 ◽  
Vol 118 (21) ◽  
pp. e2105610118
Author(s):  
Yu Ma ◽  
Ding Chen ◽  
Zhi Fang ◽  
Yapeng Zheng ◽  
Weijun Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Bacterial Cellulose ◽  
Activated Carbons ◽  
Three Dimensional ◽  
High Energy ◽  
High Energy Density ◽  
Soft Template ◽  
Carbon Aerogels ◽  
Hierarchical Porous

In terms of ideal future energy storage systems, besides the always-pursued energy/power characteristics, long-term stability is crucial for their practical application. Here, we report a facile and sustainable strategy for the scalable fabrication of carbon aerogels with three-dimensional interconnected nanofiber networks and rationally designed hierarchical porous structures, which are based on the carbonization of bacterial cellulose assisted by the soft template of Zn-1,3,5-benzenetricarboxylic acid. As binder-free electrodes, they deliver a fundamentally enhanced specific capacitance of 352 F ⋅ g–1 at 1 A ⋅ g–1 in a wide potential window (1.2 V, 6 M KOH) in comparison with those of bacterial cellulose–derived carbons (178 F ⋅ g–1) and most activated carbons (usually lower than 250 F ⋅ g–1). The as-assembled supercapacitors exhibit an ultrahigh capacitance of 297 F ⋅ g−1 at 1 A ⋅ g−1, remarkable energy density (14.83 Wh ⋅ kg−1 at 0.60 kW ⋅ kg−1), and extremely high stability, with 100% capacitance retention for up to 65,000 cycles at 6 A ⋅ g−1, representing their superior energy storage performance when compared with that of state-of-the-art supercapacitors of commercial activated carbons and biomass-derived analogs.

scholarly journals Dielectric capacitors with three-dimensional nanoscale interdigital electrodes for energy storage

2015 ◽  
Vol 1 (9) ◽  
pp. e1500605 ◽  
Author(s):  
Fangming Han ◽  
Guowen Meng ◽  
Fei Zhou ◽  
Li Song ◽  
Xinhua Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Breakdown Voltage ◽  
High Performance ◽  
Traditional Approach ◽  
Three Dimensional ◽  
High Energy ◽  
High Energy Density ◽  
Interdigital Electrodes ◽  
Large Capacitance

Dielectric capacitors are promising candidates for high-performance energy storage systems due to their high power density and increasing energy density. However, the traditional approach strategies to enhance the performance of dielectric capacitors cannot simultaneously achieve large capacitance and high breakdown voltage. We demonstrate that such limitations can be overcome by using a completely new three-dimensional (3D) nanoarchitectural electrode design. First, we fabricate a unique nanoporous anodic aluminum oxide (AAO) membrane with two sets of interdigitated and isolated straight nanopores opening toward opposite planar surfaces. By depositing carbon nanotubes in both sets of pores inside the AAO membrane, the new dielectric capacitor with 3D nanoscale interdigital electrodes is simply realized. In our new capacitors, the large specific surface area of AAO can provide large capacitance, whereas uniform pore walls and hemispheric barrier layers can enhance breakdown voltage. As a result, a high energy density of 2 Wh/kg, which is close to the value of a supercapacitor, can be achieved, showing promising potential in high-density electrical energy storage for various applications.

Self-assembled three-dimensional hierarchical porous V2O5/graphene hybrid aerogels for supercapacitors with high energy density and long cycle life

2015 ◽  
Vol 3 (5) ◽  
pp. 1828-1832 ◽  
Author(s):  
Yingjie Wu ◽  
Guohua Gao ◽  
Guangming Wu
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Three Dimensional ◽  
High Energy ◽  
Cycle Life ◽  
High Energy Density ◽  
Long Cycle Life ◽  
Hierarchical Porous ◽  
Self Assembled ◽  
Hybrid Aerogels

A self-assembled three-dimensional hierarchical porous V2O5/graphene hybrid aerogel for high-performance supercapacitor was synthesized.

High energy density aqueous zinc–benzoquinone batteries enabled by carbon cloth with multiple anchoring effects

2021 ◽  
Author(s):  
Zhiqiang Luo ◽  
Silin Zheng ◽  
Shuo Zhao ◽  
Xin Jiao ◽  
Zongshuai Gong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Porous Carbon ◽  
Large Scale ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth ◽  
Anchoring Effects ◽  
High Theoretical Capacity ◽  
Energy Storage Applications

Benzoquinone with high theoretical capacity is anchored on N-plasma engraved porous carbon as a desirable cathode for rechargeable aqueous Zn-ion batteries. Such batteries display tremendous potential in large-scale energy storage applications.

scholarly journals Designing high energy density flow batteries by tuning active-material thermodynamics

RSC Advances ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 5432-5443
Author(s):  
Shyam K. Pahari ◽  
Tugba Ceren Gokoglan ◽  
Benjoe Rey B. Visayas ◽  
Jennifer Woehl ◽  
James A. Golen ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Energy Density ◽  
Fossil Fuels ◽  
Active Material ◽  
High Energy ◽  
Theoretical Framework ◽  
High Energy Density ◽  
Density Flow ◽  
The Cost

With the cost of renewable energy near parity with fossil fuels, energy storage is paramount. We report a breakthrough on a bioinspired NRFB active-material, with greatly improved solubility, and place it in a predictive theoretical framework.

scholarly journals Novel Lithium-Ion Capacitor Based on a NiO-rGO Composite

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3586
Author(s):  
Qi An ◽  
Xingru Zhao ◽  
Shuangfu Suo ◽  
Yuzhu Bai
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Power Density ◽  
High Power ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
Cycle Life ◽  
High Energy Density ◽  
Lithium Ion Capacitor

Lithium-ion capacitors (LICs) have been widely explored for energy storage. Nevertheless, achieving good energy density, satisfactory power density, and stable cycle life is still challenging. For this study, we fabricated a novel LIC with a NiO-rGO composite as a negative material and commercial activated carbon (AC) as a positive material for energy storage. The NiO-rGO//AC system utilizes NiO nanoparticles uniformly distributed in rGO to achieve a high specific capacity (with a current density of 0.5 A g−1 and a charge capacity of 945.8 mA h g−1) and uses AC to provide a large specific surface area and adjustable pore structure, thereby achieving excellent electrochemical performance. In detail, the NiO-rGO//AC system (with a mass ratio of 1:3) can achieve a high energy density (98.15 W h kg−1), a high power density (10.94 kW kg−1), and a long cycle life (with 72.1% capacity retention after 10,000 cycles). This study outlines a new option for the manufacture of LIC devices that feature both high energy and high power densities.

Gas Altered Hierarchical Porous Graphene Aerogel with High Energy Density

2021 ◽  
Author(s):  
Xiaoning Tang ◽  
Shaokuan Zhu ◽  
Xiang Long ◽  
Yong Kou ◽  
Deyi Zheng ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Graphene Aerogel ◽  
Porous Graphene ◽  
Hierarchical Porous

scholarly journals Development on Thermochemical Energy Storage Based on CaO-Based Materials: A Review

2018 ◽  
Vol 10 (8) ◽  
pp. 2660 ◽  
Author(s):  
Yi Yuan ◽  
Yingjie Li ◽  
Jianli Zhao
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Energy Density ◽  
Circulating Fluidized Bed ◽  
High Energy ◽  
High Energy Density ◽  
Hydration Reaction ◽  
Initial Sample ◽  
Storage Performance ◽  
Low Activity

The intermittent and inconsistent nature of some renewable energy, such as solar and wind, means the corresponding plants are unable to operate continuously. Thermochemical energy storage (TES) is an essential way to solve this problem. Due to the advantages of cheap price, high energy density, and ease to scaling, CaO-based material is thought as one of the most promising storage mediums for TES. In this paper, TES based on various cycles, such as CaO/CaCO3 cycles, CaO/Ca(OH)2 cycles, and coupling of CaO/Ca(OH)2 and CaO/CaCO3 cycles, were reviewed. The energy storage performances of CaO-based materials, as well as the modification approaches to improve their performance, were critically reviewed. The natural CaO-based materials for CaO/Ca(OH)2 TES experienced the multiple hydration/dehydration cycles tend to suffer from severe sintering which leads to the low activity and structural stability. It is found that higher dehydration temperature, lower initial sample temperature of the hydration reaction, higher vapor pressure in the hydration reactor, and the use of circulating fluidized bed (CFB) reactors all can improve the energy storage performance of CaO-based materials. In addition, the energy storage performance of CaO-based materials for CaO/Ca(OH)2 TES can be effectively improved by the various modification methods. The additions of Al2O3, Na2Si3O7, and nanoparticles of nano-SiO2 can improve the structural stabilities of CaO-based materials, while the addition of LiOH can improve the reactivities of CaO-based materials. This paper is devoted to a critical review on the development on thermochemical energy storage based on CaO-based materials in the recent years.

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