scholarly journals Synthesis and Characterization of a NiCo2O4@NiCo2O4 Hierarchical Mesoporous Nanoflake Electrode for Supercapacitor Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1292 ◽  
Author(s):  
Xin Chen ◽  
Hui Li ◽  
Jianzhou Xu ◽  
F. Jaber ◽  
F. Musharavati ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Energy Storage ◽  
Nickel Foam ◽  
Morphological Characteristics ◽  
Negative Electrode ◽  
High Energy ◽  
High Energy Density ◽  
Hierarchical Porous ◽  
Galvanostatic Deposition ◽  
Binder Free

In this study, we synthesized binder-free NiCo2O4@NiCo2O4 nanostructured materials on nickel foam (NF) by combined hydrothermal and cyclic voltammetry deposition techniques followed by calcination at 350 °C to attain high-performance supercapacitors. The hierarchical porous NiCo2O4@NiCo2O4 structure, facilitating faster mass transport, exhibited good cycling stability of 83.6% after 5000 cycles and outstanding specific capacitance of 1398.73 F g−1 at the current density of 2 A·g−1, signifying its potential for energy storage applications. A solid-state supercapacitor was fabricated with the NiCo2O4@NiCo2O4 on NF as the positive electrode and the active carbon (AC) was deposited on NF as the negative electrode, delivering a high energy density of 46.46 Wh kg−1 at the power density of 269.77 W kg−1. This outstanding performance was attributed to its layered morphological characteristics. This study explored the potential application of cyclic voltammetry depositions in preparing binder-free NiCo2O4@NiCo2O4 materials with more uniform architecture for energy storage, in contrast to the traditional galvanostatic deposition methods.

3D hierarchical porous CuS flower-dispersed CNT arrays on nickel foam as a binder-free electrode for supercapacitors

2019 ◽  
Vol 43 (27) ◽  
pp. 10906-10914 ◽  
Author(s):  
Yiling Quan ◽  
Mingyuan Zhang ◽  
Guoxiang Wang ◽  
Lu Lu ◽  
Zhixin Wang ◽  
...  
Keyword(s):  
Solvothermal Method ◽  
Nickel Foam ◽  
High Energy ◽  
High Energy Density ◽  
Electrochemical Supercapacitors ◽  
Porous Copper ◽  
Hierarchical Porous ◽  
One Step ◽  
Binder Free ◽  
Cnt Arrays

To fabricate excellent electrochemical supercapacitors, 3D porous copper sulfide flower dispersed carbon nanotube on nickel foam (CuS–CNTs@NF) with high energy density and stability were synthesized via a simple one-step solvothermal method.

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 Porous Fe2O3 Nanorods on Hierarchical Porous Biomass Carbon as Advanced Anode for High-Energy-Density Asymmetric Supercapacitors

2020 ◽  
Vol 8 ◽  
Author(s):  
Pingping Yu ◽  
Wei Duan ◽  
Yanfeng Jiang
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Negative Electrode ◽  
High Energy ◽  
High Energy Density ◽  
Electrochemical Performances ◽  
Energy Storage Devices ◽  
Hydrothermal Route ◽  
Asymmetric Supercapacitors ◽  
Hierarchical Porous

In this study, a novel negative electrode material was prepared by aligning α-Fe2O3 nanorods on a hierarchical porous carbon (HPC) skeleton. The skeleton was derived from wheat flour by a facile hydrothermal route to enhance conductivity, improve surface properties, and achieve substantially good electrochemical performances. The α-Fe2O3/HPC electrode exhibits enhanced specific capacitance of 706 F g−1, which is twice higher than that of α-Fe2O3. The advanced α-Fe2O3/HPC//PANI/HPC asymmetrical supercapacitor was built with an expanded voltage of 2.0 V in 1 M Li2SO4, possessing a specific capacitance of 212 F g−1 at 1 A g−1 and a maximum energy density of 117 Wh kg−1 at 1.0 kW kg−1, along with an excellent stability of 5.8% decay in capacitance after 5,000 cycles. This study affords a simple process to develop asymmetric supercapacitors, which exhibit high electrochemical performances and are applicable in next-generation energy storage devices, based on α-Fe2O3 hybrid materials.

scholarly journals Ternary MOF-Based Redox Active Sites Enabled 3D-on-2D Nanoarchitectured Battery-Type Electrodes for High-Energy-Density Supercapatteries

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Goli Nagaraju ◽  
S. Chandra Sekhar ◽  
Bhimanaboina Ramulu ◽  
Sk. Khaja Hussain ◽  
D. Narsimulu ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Nickel Foam ◽  
Rate Capability ◽  
Negative Electrode ◽  
High Energy ◽  
High Energy Density ◽  
Phase Method ◽  
Charge Storage ◽  
Energy Storage Devices

Abstract Designing rationally combined metal–organic frameworks (MOFs) with multifunctional nanogeometries is of significant research interest to enable the electrochemical properties in advanced energy storage devices. Herein, we explored a new class of binder-free dual-layered Ni–Co–Mn-based MOFs (NCM-based MOFs) with three-dimensional (3D)-on-2D nanoarchitectures through a polarity-induced solution-phase method for high-performance supercapatteries. The hierarchical NCM-based MOFs having grown on nickel foam exhibit a battery-type charge storage mechanism with superior areal capacity (1311.4 μAh cm−2 at 5 mA cm−2), good rate capability (61.8%; 811.67 μAh cm−2 at 50 mA cm−2), and an excellent cycling durability. The superior charge storage properties are ascribed to the synergistic features, higher accessible active sites of dual-layered nanogeometries, and exalted redox chemistry of multi metallic guest species, respectively. The bilayered NCM-based MOFs are further employed as a battery-type electrode for the fabrication of supercapattery paradigm with biomass-derived nitrogen/oxygen doped porous carbon as a negative electrode, which demonstrates excellent capacity of 1.6 mAh cm−2 along with high energy and power densities of 1.21 mWh cm−2 and 32.49 mW cm−2, respectively. Following, the MOF-based supercapattery was further assembled with a renewable solar power harvester to use as a self-charging station for various portable electronic applications.

scholarly journals Tuning Mg(OH)2 Structural, Physical, and Morphological Characteristics for Its Optimal Behavior in a Thermochemical Heat-Storage Application

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1091
Author(s):  
Elpida Piperopoulos ◽  
Marianna Fazio ◽  
Emanuela Mastronardo ◽  
Maurizio Lanza ◽  
Candida Milone
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Low Cost ◽  
Morphological Characteristics ◽  
High Energy ◽  
High Energy Density ◽  
Optimal Behavior ◽  
Thermochemical Heat Storage ◽  
Term Energy ◽  
Volume Unit

Thermochemical materials (TCM) are among the most promising systems to store high energy density for long-term energy storage. To be eligible as candidates, the materials have to fit many criteria such as complete reversibility of the reaction and cycling stability, high availability of the material at low cost, environmentally friendliness, and non-toxicity. Among the most promising TCM, the Mg(OH)2/MgO system appears worthy of attention for its properties in line with those required. In the last few decades, research focused its attention on the optimization of attractive hydroxide performance to achieve a better thermochemical response, however, often negatively affecting its energy density per unit of volume and therefore compromising its applicability on an industrial scale. In this study, pure Mg(OH)2 was developed using different synthesis procedures. Reverse deposition precipitation and deposition precipitation methods were used to obtain the investigated samples. By adding a cationic surfactant (cetyl trimethylammonium bromide), deposition precipitation Mg(OH)2 (CTAB-DP-MH) or changing the precipitating precursor (N-DP-MH), the structural, physical and morphological characteristics were tuned, and the results were compared with a commercial Mg(OH)2 sample. We identified a correlation between the TCM properties and the thermochemical behavior. In such a context, it was demonstrated that both CTAB-DP-MH and N-DP-MH improved the thermochemical performances of the storage medium concerning conversion (64 wt.% and 74 wt.% respectively) and stored and released heat (887 and 1041 kJ/kgMg(OH)2). In particular, using the innovative technique not yet investigated for thermal energy storage (TES) materials, with NaOH as precipitating precursor, N-DP-MH reached the highest stored and released heat capacity per volume unit, ~684 MJ/m3.

Nanostructured porous wires of iron cobaltite: novel positive electrode for high-performance hybrid energy storage devices

2015 ◽  
Vol 3 (32) ◽  
pp. 16849-16859 ◽  
Author(s):  
Afshin Pendashteh ◽  
Jesus Palma ◽  
Marc Anderson ◽  
Rebeca Marcilla
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
High Performance ◽  
Nickel Foam ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Hybrid Energy ◽  
Hybrid Energy Storage

Nanostructured porous wires of FeCo2O4 supported on nickel foam were synthesized and employed as binder/additive-free electrodes in asymmetric aqueous supercapacitors, showing a high energy density of 23 Wh kg−1.

Controllable synthesis of 3D binary nickel–cobalt hydroxide/graphene/nickel foam as a binder-free electrode for high-performance supercapacitors

2015 ◽  
Vol 3 (23) ◽  
pp. 12530-12538 ◽  
Author(s):  
Yang Bai ◽  
Weiqi Wang ◽  
Ranran Wang ◽  
Jing Sun ◽  
Lian Gao
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Nickel Foam ◽  
High Energy ◽  
High Energy Density ◽  
Cobalt Hydroxide ◽  
Controllable Synthesis ◽  
Nickel Cobalt ◽  
Binder Free

Graphene facilitates the formation of a 3D porous binder-free electrode with controllable morphology for high energy density supercapacitors.

scholarly journals Free-Standing rGO-CNT Nanocomposites with Excellent Rate Capability and Cycling Stability for Na2SO4 Aqueous Electrolyte Supercapacitors

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1420
Author(s):  
Xiaohan Du ◽  
Zhen Qin ◽  
Zijiong Li
Keyword(s):  
Energy Storage ◽  
Specific Capacitance ◽  
Rate Capability ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Free Standing ◽  
Synergistic Enhancement ◽  
Symmetric Supercapacitor ◽  
Hierarchical Porous

Facing the increasing demand for various renewable energy storage devices and wearable and portable energy storage systems, the research on electrode materials with low costs and high energy densities has attracted great attention. Herein, free-standing rGO-CNT nanocomposites have been successfully synthesized by a facile hydrothermal method, in which the hierarchical porous network nanostructure is synergistically assembled by rGO nanosheets and CNT with interlaced network distribution. The rGO-CNT composite electrodes with synergistic enhancement of rGO and CNT exhibit high specific capacitance, excellent rate capability, exceptional conductivity and outstanding long-term cycling stability, especially for the optimal rGO-CNT30 electrode. Applied to a symmetric supercapacitor systems (SSS) assembled with an rGO-CNT30 electrode and with 1 M Na2SO4 aqueous solution as the electrolyte, the SSS possesses a high energy density of 12.29 W h kg−1 and an outstanding cycling stability, with 91.42% of initial specific capacitance after 18,000 cycles. Results from these electrochemical properties suggest that the rGO-CNT30 nanocomposite electrode is a promising candidate for the development of flexible and lightweight high-performance supercapacitors.

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