Phytic acid-assisted electrochemically synthesized three-dimensional O, P-functionalized graphene monoliths with high capacitive performance

Nanoscale ◽  
2017 ◽  
Vol 9 (34) ◽  
pp. 12601-12608 ◽  
Author(s):  
Han-Yu Li ◽  
Lang Liu ◽  
Zhi-Wei Zhang ◽  
Shu-Shen Wang ◽  
Yao Yu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Energy Storage ◽  
Mechanical Strength ◽  
Porous Structure ◽  
Phytic Acid ◽  
Three Dimensional ◽  
Energy Storage Materials ◽  
Functionalized Graphene ◽  
Characteristic P ◽  
Capacitive Performance

Three-dimensional functionalized graphene monoliths (3DFGMs) have attracted intensive attention as energy storage materials due to their unique interconnected porous structure, good electrical conductivity, excellent mechanical strength, and pseudocapacitive characteristic.

Ni-doping induced phase transition and electron evolution in cobalt hexacyanoferrate as a stable cathode for sodium ion batteries

2020 ◽  
Author(s):  
Junjie Quan ◽  
Enze Xu ◽  
Hanwen Zhu ◽  
Yajing Chang ◽  
Yi Zhu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Energy Storage ◽  
Ion Channels ◽  
Three Dimensional ◽  
Sodium Ion ◽  
Energy Storage Materials ◽  
Sodium Ion Batteries ◽  
Ni Doping ◽  
Prussian Blue Analogues ◽  
Cobalt Hexacyanoferrate

Prussian blue analogues are potential competitive energy storage materials due to its diverse metal combinations and wide three-dimensional ion channels. Here, we prepared a new high crystalline monoclinic nickel doped...

scholarly journals Liquid Phase Synthesis of CoP Nanoparticles with High Electrical Conductivity for Advanced Energy Storage

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Guo-Qun Zhang ◽  
Bo Li ◽  
Mao-Cheng Liu ◽  
Shang-Ke Yuan ◽  
Leng-Yuan Niu
Keyword(s):  
Electrical Conductivity ◽  
Energy Storage ◽  
Liquid Phase ◽  
Specific Capacitance ◽  
Current Density ◽  
High Surface ◽  
High Surface Area ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Materials

Transition metal phosphide alloys possess the metalloid characteristics and superior electrical conductivity and are a kind of high electrical conductive pseudocapacitive materials. Herein, high electrical conductive cobalt phosphide alloys are fabricated through a liquid phase process and a nanoparticles structure with high surface area is obtained. The highest specific capacitance of 286 F g−1 is reached at a current density of 0.5 A g−1. 63.4% of the specific capacitance is retained when the current density increased 16 times and 98.5% of the specific capacitance is maintained after 5000 cycles. The AC//CoP asymmetric supercapacitor also shows a high energy density (21.3 Wh kg−1) and excellent stability (97.8% of the specific capacitance is retained after 5000 cycles). The study provides a new strategy for the construction of high-performance energy storage materials by enhancing their intrinsic electrical conductivity.

Supercapacitive behavior depending on the mesopore size of three-dimensional micro-, meso- and macroporous silicon carbide for supercapacitors

2015 ◽  
Vol 17 (6) ◽  
pp. 4424-4433 ◽  
Author(s):  
Myeongjin Kim ◽  
Ilgeun Oh ◽  
Jooheon Kim
Keyword(s):  
Silicon Carbide ◽  
Porous Structure ◽  
Synthesis Method ◽  
Three Dimensional ◽  
Macroporous Silicon ◽  
Facile Synthesis ◽  
Capacitive Performance ◽  
Structure And Morphology

A facile synthesis method is developed to prepare the three-dimensional micro-, meso- and macroporous silicon carbide spheres that exhibit a unique porous structure and morphology, resulting in high super-capacitive performance.

scholarly journals Nitrogen-Doped Carbon Encapsulated Partial Zinc Stannate Nanocomposite for High-Performance Energy Storage Materials

2021 ◽  
Vol 9 ◽  
Author(s):  
Jiage Yu ◽  
Zhijie Liu ◽  
Xian Zhang ◽  
Yu Ding ◽  
Zhengbing Fu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Energy Storage ◽  
Volume Expansion ◽  
High Performance ◽  
Energy Storage Materials ◽  
Core Shell ◽  
Zinc Stannate ◽  
Nitrogen Doped ◽  
Storage Materials ◽  
Nitrogen Doped Carbon

As a bimetal oxide, partial zinc stannate (ZnSnO3) is one of the most promising next-generation lithium anode materials, which has the advantages of low operating voltage, large theoretical capacity (1,317 mA h g−1), and low cost. However, the shortcomings of large volume expansion and poor electrical conductivity hinder its practical application. The core-shell ZnSnO3@ nitrogen-doped carbon (ZSO@NC) nanocomposite was successfully obtained by coating ZnSnO3 with polypyrrole (PPy) through in situ polymerization under ice-bath conditions. Benefiting from this unique compact structure, the shell formed by PPy cannot only effectively alleviate the volume expansion effect of ZnSnO3 but also enhance the electrical conductivity, thus, greatly improving the lithium storage performance. ZSO@NC can deliver a reversible capacity of 967 mA h g−1 at 0.1 A g−1 after 300 cycles and 365 mA h g−1 at 2 A g−1 after 1,000 cycles. This work may provide a new avenue for the synthesis of bimetal oxide with a core–shell structure for high-performance energy storage materials.

A novel cord-shaped supercapacitor with high stretchability

2019 ◽  
Vol 89 (19-20) ◽  
pp. 4265-4271
Author(s):  
Wenqi Nie ◽  
Shu Zhang ◽  
Xin Ding ◽  
Jiyong Hu ◽  
Xudong Yang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Power Density ◽  
Three Dimensional ◽  
Storage Device ◽  
High Porosity ◽  
Energy Storage Device ◽  
High Capacitance ◽  
Capacitive Performance ◽  
Integration Technology

Cord-shaped stretchable supercapacitors have received much attention due to their high stretchability and three-dimensional flexibility. For coaxial supercapacitors, lower capacitive performance and the inextensibility of the separation layer have been the important factors hindering further developments. In this work, we developed an integration technology to fabricate multiple yarn-electrodes by a layer-to-layer braiding. Between the inner and outer electrodes there is a braided elastic separator by braiding multiple spandex yarns. The braided separator features not only a reliable separation of the inner and outer electrodes, but also a high stretchability and high porosity. The cord-shaped supercapacitor shows an excellent capacitive performance of 60.1 mF/cm2 with energy density of 5.4 μWh/cm2, power density of 0.52 mW/cm2 and extremely high capacitance retention of 99.8% under the strain of 100%, demonstrating the application value of this stretchable energy storage device.

scholarly journals Formation of 3D graphene foams on soft templated metal monoliths

Nanoscale ◽  
2016 ◽  
Vol 8 (27) ◽  
pp. 13303-13310 ◽  
Author(s):  
Michael K. Tynan ◽  
David W. Johnson ◽  
Ben P. Dobson ◽  
Karl S. Coleman
Keyword(s):  
Electrical Conductivity ◽  
Energy Storage ◽  
Porous Structure ◽  
Electrode Material ◽  
Pollution Control ◽  
High Electrical Conductivity ◽  
Energy Storage Devices ◽  
3D Graphene ◽  
Storage Devices ◽  
Graphene Foams

Graphene foams are leading contenders as frameworks for polymer thermosets, filtration/pollution control and for use as an electrode material in energy storage devices, taking advantage of graphene's high electrical conductivity and the porous structure of the foam.

Fabrication of Calcite Foam by Inverse Ceramic Foam Method

2012 ◽  
Vol 529-530 ◽  
pp. 153-156 ◽  
Author(s):  
Tram Nguyen Xuan Thanh ◽  
Michito Maruta ◽  
Kanji Tsuru ◽  
Alireza Valanezhad ◽  
Shigeki Matsuya ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Porous Structure ◽  
Polyurethane Foam ◽  
Ceramic Powder ◽  
Three Dimensional ◽  
Ceramic Foam ◽  
Carbonate Apatite ◽  
High Porosity ◽  
Synthetic Resin ◽  
Polyurethane Sponge

We have previously reported that calcite foam that had interconnected porous structure could be prepared by ceramic foam method and it transformed to carbonate apatite (CO3Ap). In the ceramic foam method, polyurethane sponge was used as a template. The polyurethane sponge was immersed in the ceramics slurry, and the strut of the polyurethane foam was covered by ceramic powder. After that it was dried and sintered at high temperature. Calcite foams produced by this approach were comprised of a three-dimensional (3D) interconnected porous structure that facilitated cell penetration. However, all foams have a common limitation: the inherent lack of mechanical strength associated with high porosity. Therefore, in this study, an inverse ceramic foam method was studied; multi polyurethane coating method using polyurethane foam as a template. In this study, the compressive strength was improved by an inverse replication allowed for decreasing porosity while at the same time maintaining the interconnectivity. The burnable synthetic resin coating layer was introduced onto struts of polyurethane foam to make the triangular struts become more round and thick, consequently producing large round capillary within the foam structure fulfilling the requirement for osteoblast colonization. In particular, polyurethane foam was dipped orderly into two monomers, followed by centrifugation to remove excess liquids inside foam. After resin curing, a layer of synthetic resin was coated strut of foam. Calcium hydroxide Ca (OH)2 slurry was then infiltrated into resin coated-polyurethane foam. By firing at 600°C in O2-CO2 stream, polyurethane template was burnt off and Ca (OH)2 was converted into calcite. Negative replicated calcite foam was fabricated and characterized micro-structurally with interconnectivity and improved mechanical strength. The results obtained in this study suggested that this method dramatically improved the mechanical strength of the calcite foam without sacrificing the interconnected structure, and this means that the calcite foam obtained in this method could be precursors for the 3D interconnected porous CO3Ap foam.

scholarly journals Cellulose Nanofiber/Carbon Nanotube Conductive Nano-Network as a Reinforcement Template for Polydimethylsiloxane Nanocomposite

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1000 ◽  
Author(s):  
Chuchu Chen ◽  
Xiangting Bu ◽  
Qian Feng ◽  
Dagang Li
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Mechanical Strength ◽  
Polymer Concentration ◽  
Composite Films ◽  
Three Dimensional ◽  
Cellulose Nanofiber ◽  
Vacuum Filtration ◽  
Flexible Devices ◽  
Nanoscale Fibers

Both cellulose nanofiber (CNF) and carbon nanotube (CNT) are nanoscale fibers that have shown reinforcing effects in polymer composites. It’s worth noting that CNF and CNT could form a three-dimensional nano-network via mixing and vacuum filtration, which exhibit excellent mechanical strength and electrical conductivity. In this study, the developed CNF/CNT film was applied as a nano-network template and immersed into polydimethylsiloxane (PDMS) solutions. By controlling the immersed polydimethylsiloxane pre-polymer concentration, the PDMS/CNF/CNT nanocomposite with various PDMS contents were fabricated after a curing process. Morphological images showed that the CNF/CNT nano-network was well-preserved inside the PDMS, which resulted in significantly improved mechanical strength. While increasing the PDMS content (~71.3 wt %) gave rise to decreased tensile strength, the PDMS-30/CNF/CNT showed a fracture strain of 7.5%, which was around seven fold higher than the rigid CNF/CNT and still kept a desirable strength—Young’s modulus and conductivity of 18.3 MPa, 805 MPa, and 0.8 S/cm, respectively. Therefore, with the enhanced mechanical properties and the electrical conductivity, the prepared PDMS/CNF/CNT composite films may offer promising and broad prospects in the field of flexible devices.

Functionalization of Graphene Aerogels and their Applications in Energy Storage and Conversion

2018 ◽  
Vol 232 (9-11) ◽  
pp. 1647-1674 ◽  
Author(s):  
Chen Wang ◽  
Qiangang Fu ◽  
Dan Wen
Keyword(s):  
Energy Storage ◽  
Specific Surface ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Energy Storage And Conversion ◽  
Cyclic Stability ◽  
Large Specific Surface Area ◽  
Porous Structures ◽  
Functionalized Graphene ◽  
Graphene Aerogels

Abstract Functionalized graphene aerogels (GAs) not only own the advantages of the original ones like large specific surface area, three-dimensional porous structures, high specific capacitance and excellent cyclic stability, but also realize the function expansion due to the collective properties endowed via different methods. These characteristics make them advantageous in some promising applications. In this minireview, we focus on the various functionalization methods of GAs and especially their use in the applications of energy storage and conversion like batteries, supercapacitors and fuel cells, etc.

scholarly journals Carbon nanotube–polyaniline core–shell nanostructured hydrogel for electrochemical energy storage

RSC Advances ◽  
2015 ◽  
Vol 5 (48) ◽  
pp. 37970-37977 ◽  
Author(s):  
Po-Yen Chen ◽  
Noémie-Manuelle Dorval Courchesne ◽  
Md Nasim Hyder ◽  
Jifa Qi ◽  
Angela M. Belcher ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Energy Storage ◽  
Three Dimensional ◽  
Electrochemical Activity ◽  
Electrochemical Energy Storage ◽  
Core Shell ◽  
Conductive Materials ◽  
Conductive Hydrogels ◽  
Highly Porous

Highly porous three-dimensional core (carbon nanotube)–shell (polyaniline) conductive hydrogels synergize the advantageous features of hydrogels and conductive materials, showing enhanced electrical conductivity and electrochemical activity.

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