scholarly journals Phytic acid controlled in situ synthesis of amorphous cobalt phosphate/carbon composite as anode materials with a high mass loading for symmetrical supercapacitor: amorphization of the electrode to boost the energy density

2020 ◽  
Vol 2 (10) ◽  
pp. 4918-4929 ◽  
Author(s):  
Taewoo Kim ◽  
Arjun Prasad Tiwari ◽  
Kisan Chhetri ◽  
Gunendra Prasad Ojha ◽  
Hyoju Kim ◽  
...  
Keyword(s):  
Energy Density ◽  
Phytic Acid ◽  
Anode Materials ◽  
Carbon Composite ◽  
In Situ Synthesis ◽  
High Mass ◽  
Controlled Synthesis ◽  
Mass Loading ◽  
Cobalt Phosphate

Phytic acid (PA) mediates the controlled synthesis of amorphous cobalt phosphate/carbon (CoPi/C) composite which works in both the positive and negative potential ranges, making it possible to assemble a symmetrical supercapacitor (SSC) device.

scholarly journals In-situ synthesis of Fe2O3/rGO using different hydrothermal methods as anode materials for lithium-ion batteries

2020 ◽  
Vol 59 (1) ◽  
pp. 477-487 ◽  
Author(s):  
Zhuang Liu ◽  
Haiyang Fu ◽  
Bo Gao ◽  
Yixuan Wang ◽  
Kui Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oleic Acid ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Anode Materials ◽  
Lithium Ion ◽  
In Situ Synthesis ◽  
Cycle Performance ◽  
Reduced Graphene

AbstractThis paper studies in-situ synthesis of Fe2O3/reduced graphene oxide (rGO) anode materials by different hydrothermal process.Scanning Electron Microscopy (SEM) analysis has found that different processes can control the morphology of graphene and Fe2O3. The morphologies of Fe2O3 prepared by the hydrothermal in-situ and oleic acid-assisted hydrothermal in-situ methods are mainly composed of fine spheres, while PVP assists The thermal in-situ law presents porous ellipsoids. Graphene exhibits typical folds and small lumps. X-ray diffraction analysis (XRD) analysis results show that Fe2O3/reduced graphene oxide (rGO) is generated in different ways. Also, the material has good crystallinity, and the crystal form of the iron oxide has not been changed after adding GO. It has been reduced, and a characteristic peak appears around 25°, indicating that a large amount of reduced graphene exists. The results of the electrochemical performance tests have found that the active materials prepared in different processes have different effects on the cycle performance of lithium ion batteries. By comprehensive comparison for these three processes, the electro-chemical performance of the Fe2O3/rGO prepared by the oleic acid-assisted hydrothermal method is best.

scholarly journals Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber-Shaped Supercapacitors

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Xiaona Wang ◽  
Zhenyu Zhou ◽  
Zhijian Sun ◽  
Jinho Hah ◽  
Yagang Yao ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
High Performance ◽  
High Specific Capacitance ◽  
Superior Performance ◽  
High Mass ◽  
Mass Loading ◽  
Energy Storage Devices ◽  
Free Standing ◽  
Cell Potential

Abstract Coaxial fiber-shaped supercapacitors are a promising class of energy storage devices requiring high performance for flexible and miniature electronic devices. Yet, they are still struggling from inferior energy density, which comes from the limited choices in materials and structure used. Here, Zn-doped CuO nanowires were designed as 3D framework for aligned distributing high mass loading of MnO2 nanosheets. Zn could be introduced into the CuO crystal lattice to tune the covalency character and thus improve charge transport. The Zn–CuO@MnO2 as positive electrode obtained superior performance without sacrificing its areal and gravimetric capacitances with the increasing of mass loading of MnO2 due to 3D Zn–CuO framework enabling efficient electron transport. A novel category of free-standing asymmetric coaxial fiber-shaped supercapacitor based on Zn0.11CuO@MnO2 core electrode possesses superior specific capacitance and enhanced cell potential window. This asymmetric coaxial structure provides superior performance including higher capacity and better stability under deformation because of sufficient contact between the electrodes and electrolyte. Based on these advantages, the as-prepared asymmetric coaxial fiber-shaped supercapacitor exhibits a high specific capacitance of 296.6 mF cm−2 and energy density of 133.47 μWh cm−2. In addition, its capacitance retention reaches 76.57% after bending 10,000 times, which demonstrates as-prepared device’s excellent flexibility and long-term cycling stability.

scholarly journals Hierarchical Carbon Microtube@Nanotube Core–Shell Structure for High-Performance Oxygen Electrocatalysis and Zn–Air Battery

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenfu Xie ◽  
Jianming Li ◽  
Yuke Song ◽  
Shijin Li ◽  
Jianbo Li ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Power ◽  
High Performance ◽  
Rational Design ◽  
Specific Capacity ◽  
High Mass ◽  
Core Shell ◽  
High Power Density ◽  
Mass Loading

AbstractZinc–air batteries (ZABs) hold tremendous promise for clean and efficient energy storage with the merits of high theoretical energy density and environmental friendliness. However, the performance of practical ZABs is still unsatisfactory because of the inevitably decreased activity of electrocatalysts when assembly into a thick electrode with high mass loading. Herein, we report a hierarchical electrocatalyst based on carbon microtube@nanotube core–shell nanostructure (CMT@CNT), which demonstrates superior electrocatalytic activity for oxygen reduction reaction and oxygen evolution reaction with a small potential gap of 0.678 V. Remarkably, when being employed as air–cathode in ZAB, the CMT@CNT presents an excellent performance with a high power density (160.6 mW cm−2), specific capacity (781.7 mAhg Zn −1 ) as well as long cycle stability (117 h, 351 cycles). Moreover, the ZAB performance of CMT@CNT is maintained well even under high mass loading (3 mg cm−2, three times as much as traditional usage), which could afford high power density and energy density for advanced electronic equipment. We believe that this work is promising for the rational design of hierarchical structured electrocatalysts for advanced metal-air batteries.

In situ synthesis of CoFe2O4–Co rods as anode materials for lithium ion batteries

2013 ◽  
Vol 277 ◽  
pp. 25-29 ◽  
Author(s):  
Mei Zhang ◽  
Yuhong Jin ◽  
Qianqian Wen ◽  
Cheng Chen ◽  
Mengqiu Jia
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Lithium Ion ◽  
In Situ Synthesis

In Situ Synthesis of MnO2/Porous Graphitic Carbon Composites as High-Capacity Anode Materials for Lithium-Ion Batteries

2020 ◽  
Vol 34 (2) ◽  
pp. 2480-2491 ◽  
Author(s):  
Huihui Zeng ◽  
Baolin Xing ◽  
Chuantao Zhang ◽  
Lunjian Chen ◽  
Huihui Zhao ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Capacity ◽  
Lithium Ion ◽  
In Situ Synthesis ◽  
Porous Graphitic Carbon ◽  
Graphitic Carbon ◽  
Carbon Composites

A new route to tailor high mass loading all-solid-state supercapacitor with ultra-high volumetric energy density

Carbon ◽  
2018 ◽  
Vol 136 ◽  
pp. 46-53 ◽  
Author(s):  
Zhongqian Song ◽  
Weiyan Li ◽  
Yu Bao ◽  
Zhonghui Sun ◽  
Lifang Gao ◽  
...  
Keyword(s):  
Solid State ◽  
Energy Density ◽  
High Mass ◽  
Mass Loading

Electrochemically Reduced Ultra-high Mass Loading Three-Dimensional Carbon Nanofiber Network: A Reproducible and Stable Cell Voltage of 2.0 V and High Energy Density Symmetric Supercapacitor

Nanoscale ◽  
2021 ◽  
Author(s):  
Gunendra Prasad Ojha ◽  
Bishweshwar Pant ◽  
Jiwan Acharya ◽  
Mira Park
Keyword(s):  
Energy Density ◽  
Carbon Nanofiber ◽  
Three Dimensional ◽  
Cell Voltage ◽  
High Energy ◽  
Low Energy ◽  
High Energy Density ◽  
High Mass ◽  
Mass Loading ◽  
Symmetric Supercapacitor

Commercial supercapacitors need high mass loading of more than 10 mg cm-2 and a high working potential window to resolve the low energy density concern. Herein, we have demonstrated a...

In situ synthesis of TiO2(B) nanotube/nanoparticle composite anode materials for lithium ion batteries

2015 ◽  
Vol 26 (42) ◽  
pp. 425403 ◽  
Author(s):  
Xiang Liu ◽  
Qian Sun ◽  
Alan M C Ng ◽  
Aleksandra B Djurišić ◽  
Maohai Xie ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Lithium Ion ◽  
In Situ Synthesis ◽  
Composite Anode
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