NiFe2O4nanoparticles coated on 3D graphene capsule as electrode for advanced energy storage applications

2018 ◽  
Vol 47 (39) ◽  
pp. 14052-14059 ◽  
Author(s):  
Shaymaa AL-Rubaye ◽  
Ranjusha Rajagopalan ◽  
Chandrasekhar Subramaniyam ◽  
Zhixin Tai ◽  
Jian Xian ◽  
...  
Keyword(s):  
Energy Storage ◽  
Specific Capacitance ◽  
Cycling Stability ◽  
3D Graphene ◽  
Energy Storage Applications

The 3D nanostructured NiFe2O4/graphene capsules employed in this study exhibited specific capacitance of 1028 F g−1with a remarkable cycling stability of 10 000 cycles.

A novel synthesis of ultra thin graphene sheets for energy storage applications using malonic acid as a reducing agent

2014 ◽  
Vol 2 (47) ◽  
pp. 20345-20357 ◽  
Author(s):  
Anil Kumar ◽  
Mahima Khandelwal
Keyword(s):  
Energy Storage ◽  
Potential Energy ◽  
Specific Capacitance ◽  
Malonic Acid ◽  
High Specific Capacitance ◽  
Reducing Agent ◽  
Graphene Sheets ◽  
Novel Synthesis ◽  
Energy Storage Applications ◽  
Charge Discharge

Novel ultrathin graphene sheets (0.41 ± 0.03 nm) with increased sp2 character, high specific capacitance and charge–discharge capability have been synthesized and demonstrated to have potential energy storage applications.

A morphology controllable synthesis of 3D graphene nanostructures and their energy storage applications

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 70972-70977 ◽  
Author(s):  
Jie Zhao ◽  
Wei-Hua Li ◽  
Hui-Zhong Xu ◽  
Li-Shui Sun ◽  
Chao-Qin Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Controllable Synthesis ◽  
3D Graphene ◽  
Sulfonated Graphene ◽  
Energy Storage Applications ◽  
Graphene Nanostructures

A morphology-controllable synthesis of 3D sulfonated graphene (SG) architectures were carried out.

scholarly journals Microwave Assisted Synthesis of MoS2/PANI/ZnO Nanocomposites as a Working Electrode for Energy Storage Applications

2021 ◽  
Vol 33 (7) ◽  
pp. 1585-1593
Author(s):  
J. Balavijayalakshmi ◽  
S. Krithika
Keyword(s):  
Energy Storage ◽  
Specific Capacitance ◽  
Transition Probabilities ◽  
Average Crystallite Size ◽  
Microwave Assisted Synthesis ◽  
Transition Metal Dichalcogenide ◽  
Active Electrode ◽  
Microwave Assisted ◽  
Ft Ir ◽  
Energy Storage Applications

Transition metal dichalcogenide and polyaniline doped zinc oxide nanocomposites influence the transition probabilities and electronic structure. In present study, the various concentrations of MoS2/PANI/ZnO nanocomposites are synthesized by microwave assisted method. These nanocomposites are characterized by using XRD, FESEM, HRTEM and FT-IR. The XRD results revealed an average crystallite size of synthesized nanocomposites, which was found to be 19-24 nm. The electrochemical properties of the nanocomposites are studied through the CV, EIS and GCD for the application of supercapacitor as an active electrode material. The MoS2/PANI/ZnO nanocomposites exhibited a specific capacitance of 577 F g-1 and also retained 90% of its initial specific capacitance even after 5000 cycles. Hence MoS2/PANI/ZnO nanocomposites have potential application for energy storage applications.

scholarly journals Electrochemical Properties of Graphene Oxide Nanoribbons/Polypyrrole Nanocomposites

2019 ◽  
Vol 5 (2) ◽  
pp. 18 ◽  
Author(s):  
Johara Al Dream ◽  
Camila Zequine ◽  
K. Siam ◽  
Pawan K. Kahol ◽  
S. R. Mishra ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Energy Storage ◽  
Conducting Polymers ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Graphene Nanoribbons ◽  
Graphene Oxide Nanoribbons ◽  
Energy Storage Applications

Graphene is a highly studied material due to its unique electrical, optical, and mechanical properties. Graphene is widely applied in the field of energy such as in batteries, supercapacitors, and solar cells. The properties of graphene can be further improved by making nanocomposites with conducting polymers. In this work, graphene oxide nanoribbons (GONRs) were synthesized by unzipping multiwall carbon nanotubes. Graphene nanoribbons were used to make nanocomposites with polypyrrole for energy storage applications. The synthesized nanocomposites were structurally and electrochemically characterized to understand their structure and electrochemical properties. The electrochemical characterizations of these nanocomposites were carried out using cyclic voltammetry. The specific capacitance of the nanocomposites was observed to decrease with increasing scan rates. The highest specific capacitance of 2066 F/g was observed using cyclic voltammetry for the optimized nanocomposite of GONR and polypyrrole. Our study suggests that the electrochemical properties of graphene or polypyrrole can be improved by making their composites and that they could be successfully used as electrode materials for energy storage applications. This study can also be extended to the self-assembly of other conducting polymers and graphene nanoribbons through a simple route for various other applications.

scholarly journals An Overview on Ruthenium Oxide Composites – Challenging Material for Energy Storage Applications

2018 ◽  
Vol 15 (1) ◽  
pp. 30-40 ◽  
Author(s):  
Dipanwita Majumdar
Keyword(s):  
Energy Storage ◽  
Specific Capacitance ◽  
Activated Carbons ◽  
Active Material ◽  
Ruthenium Oxide ◽  
High Specific Capacitance ◽  
Electrochemical Performances ◽  
Storage Devices ◽  
Ruthenium Oxides ◽  
Energy Storage Applications

Ruthenium oxides owing to their high specific capacitance have been widely identified as promising materials for electrochemical charge storage devices. However, high priced ruthenium precursors restrict their commercial usage. Accordingly, numerous explorations investigated the influences on capacitive behavior of ruthenium oxide on blending with varied materials like other metal oxides, activated carbons, conducting polymers, CNTs and functionalized graphene systems as composites. The aim had been to optimize the material cost without compromising with but improving the composite electrochemical performances. The scientific explorations reveal that the overall specific capacitance of composites is a strongly related to the ruthenium oxide (RuO2) present in the system since it is the main electro-active material providing the Faradaic pseudocapacitances besides the electrical double layer contributions from the base carbon component of the composite. Major progress in the theoretical and practical research and development in this particular field has enviced a large number of research articles and technical reports in the recent past. The current investigations focus on utilizing minimum amount of metal in the composite; upholding the synergistic effect from the metal oxide and the support (carbon materials generally) to obtain better electrochemical signatures. Optimization of important factors leading to reduced nanostructure agglomeration, minimum electrostatic resistance and ultrafast proton/electrons diffusion through the hollow porous structures may ultimately result to the theoretically expected specific capacitance. Nonetheless, to the best of knowledge of the author, there is no systematic review available pertaining to recent advancement of the composites of RuO2. Thus, this overview categorically narrates recent progresses on the fabrication, performances and achievements of ruthenium oxide composite as electrode material in energy storage applications which will be beneficial especially to the newcomers in this field of research.

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.

Beyond graphene foam, a new form of three-dimensional graphene for supercapacitor electrodes

2016 ◽  
Vol 4 (5) ◽  
pp. 1876-1886 ◽  
Author(s):  
Lu Zhang ◽  
Derek DeArmond ◽  
Noe T. Alvarez ◽  
Daoli Zhao ◽  
Tingting Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electrode Material ◽  
Three Dimensional ◽  
Fabrication Process ◽  
Graphene Foam ◽  
3D Graphene ◽  
Energy Storage Applications ◽  
New Form

Graphene foam (GF) is a three-dimensional (3D) graphene structure that has been intensively studied as an electrode material for energy storage applications. Here we report a new design and fabrication process of an electrode material called graphene pellet (GP) for energy storage applications.

(Invited) Electrochemical Production of Graphene and Controlled Assembly of 3D Graphene Electrodes for Energy Storage Applications

2020 ◽  
Vol MA2020-01 (5) ◽  
pp. 600-600
Author(s):  
Michael J Lee ◽  
Hoyoung Lee ◽  
Kyungbin Lee ◽  
Byeongyong Lee ◽  
Seung Woo Lee
Keyword(s):  
Energy Storage ◽  
3D Graphene ◽  
Controlled Assembly ◽  
Electrochemical Production ◽  
Energy Storage Applications

scholarly journals A porous graphene–NiFe2O4 nanocomposite with high electrochemical performance and high cycling stability for energy storage applications

2020 ◽  
Vol 2 (9) ◽  
pp. 4229-4241 ◽  
Author(s):  
Meenaketan Sethi ◽  
U. Sandhya Shenoy ◽  
D. Krishna Bhat
Keyword(s):  
Energy Storage ◽  
Electrochemical Performance ◽  
Solvothermal Synthesis ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Cycling Stability ◽  
High Rate ◽  
High Rate Capability ◽  
Porous Graphene ◽  
Energy Storage Applications

Solvothermal synthesis of a porous graphene–NiFe2O4 nanocomposite exhibiting high specific capacitance and high rate capability along with high cycling stability.

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