scholarly journals Nitrogen-Doped Hierarchical Porous Activated Carbon Derived from Paddy for High-Performance Supercapacitors

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 318
Author(s):  
Yudan Yuan ◽  
Yi Sun ◽  
Zhichen Feng ◽  
Xingjian Li ◽  
Ruowei Yi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Specific Capacitance ◽  
High Performance ◽  
High Energy ◽  
High Energy Density ◽  
Scale Production ◽  
Nitrogen Doped ◽  
Hierarchical Porous ◽  
Porous Activated Carbon

A facile and environmentally friendly fabrication is proposed to prepare nitrogen-doped hierarchical porous activated carbon via normal-pressure popping, one-pot activation and nitrogen-doping process. The method adopts paddy as carbon precursor, KHCO3 and dicyandiamide as the safe activating agent and nitrogen dopant. The as-prepared activated carbon presents a large specific surface area of 3025 m2·g−1 resulting from the synergistic effect of KHCO3 and dicyandiamide. As an electrode material, it shows a maximum specific capacitance of 417 F·g−1 at a current density of 1 A·g−1 and very good rate performance. Furthermore, the assembled symmetric supercapacitor presents a large specific capacitance of 314.6 F·g−1 and a high energy density of 15.7 Wh·Kg−1 at 1 A·g−1, maintaining 14.4 Wh·Kg−1 even at 20 A·g−1 with the energy density retention of 91.7%. This research demonstrates that nitrogen-doped hierarchical porous activated carbon derived from paddy has a significant potential for developing a high-performance renewable supercapacitor and provides a new route for economical and large-scale production in supercapacitor application.

scholarly journals Fabrication of Hierarchical NiMoO4/NiMoO4 Nanoflowers on Highly Conductive Flexible Nickel Foam Substrate as a Capacitive Electrode Material for Supercapacitors with Enhanced Electrochemical Performance

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1143 ◽  
Author(s):  
Anil Yedluri ◽  
Tarugu Anitha ◽  
Hee-Je Kim
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
High Performance ◽  
Nickel Foam ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Charge Discharge

Hierarchical NiMoO4/NiMoO4 nanoflowers were fabricated on highly conductive flexible nickel foam (NF) substrates using a facile hydrothermal method to achieve rapid charge-discharge ability, high energy density, long cycling lifespan, and higher flexibility for high-performance supercapacitor electrode materials. The synthesized composite electrode material, NF/NiMoO4/NiMoO4 with a nanoball-like NF/NiMoO4 structure on a NiMoO4 surface over a NF substrate, formed a three-dimensional interconnected porous network for high-performance electrodes. The novel NF/NiMoO4/NiMoO4 nanoflowers not only enhanced the large surface area and increased the electrochemical activity, but also provided an enhanced rapid ion diffusion path and reduced the charge transfer resistance of the entire electrode effectively. The NF/NiMoO4/NiMoO4 composite exhibited significantly improved supercapacitor performance in terms of a sustained cycling life, high specific capacitance, rapid charge-discharge capability, high energy density, and good rate capability. Electrochemical analysis of the NF/NiMoO4/NiMoO4 nanoflowers fabricated on the NF substrate revealed ultra-high electrochemical performance with a high specific capacitance of 2121 F g−1 at 12 mA g−1 in a 3 M KOH electrolyte and 98.7% capacitance retention after 3000 cycles at 14 mA g−1. This performance was superior to the NF/NiMoO4 nanoball electrode (1672 F g−1 at 12 mA g−1 and capacitance retention 93.4% cycles). Most importantly, the SC (NF/NiMoO4/NiMoO4) device displayed a maximum energy density of 47.13 W h kg−1, which was significantly higher than that of NF/NiMoO4 (37.1 W h kg−1). Overall, the NF/NiMoO4/NiMoO4 composite is a suitable material for supercapacitor applications.

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.

A high performance asymmetric supercapacitor based on in situ prepared CuCo2O4 nanowires and PPy nanoparticles on a two-ply carbon nanotube yarn

2018 ◽  
Vol 47 (47) ◽  
pp. 17146-17152 ◽  
Author(s):  
Xiao Liang ◽  
Qiufan Wang ◽  
Yun Ma ◽  
Daohong Zhang
Keyword(s):  
Carbon Nanotube ◽  
Energy Density ◽  
Specific Capacitance ◽  
High Performance ◽  
Negative Electrode ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Asymmetric Supercapacitor

A two-ply CNT yarn asymmetric supercapacitor was fabricated by assembling a CuCo2O4 nanowire positive electrode and a PPy nanoparticle negative electrode. The full cell exhibits a high specific capacitance of 59.55 mF cm−2 and a high energy density of 0.02 mW h cm−2.

scholarly journals Facile Synthesis of FeS@C Particles Toward High-Performance Anodes for Lithium-Ion Batteries

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1467
Author(s):  
Xuanni Lin ◽  
Zhuoyi Yang ◽  
Anru Guo ◽  
Dong Liu
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
High Current Density ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Hierarchical Porous

High energy density batteries with high performance are significantly important for intelligent electrical vehicular systems. Iron sulfurs are recognized as one of the most promising anodes for high energy density lithium-ion batteries because of their high theoretical specific capacity and relatively stable electrochemical performance. However, their large-scale commercialized application for lithium-ion batteries are plagued by high-cost and complicated preparation methods. Here, we report a simple and cost-effective method for the scalable synthesis of nanoconfined FeS in porous carbon (defined as FeS@C) as anodes by direct pyrolysis of an iron(III) p-toluenesulfonate precursor. The carbon architecture embedded with FeS nanoparticles provides a rapid electron transport property, and its hierarchical porous structure effectively enhances the ion transport rate, thereby leading to a good electrochemical performance. The resultant FeS@C anodes exhibit high reversible capacity and long cycle life up to 500 cycles at high current density. This work provides a simple strategy for the mass production of FeS@C particles, which represents a critical step forward toward practical applications of iron sulfurs anodes.

scholarly journals Hierarchical porous graphitic carbon for high-performance supercapacitors at high temperature

RSC Advances ◽  
2017 ◽  
Vol 7 (55) ◽  
pp. 34488-34496 ◽  
Author(s):  
Chong Chen ◽  
Dengfeng Yu ◽  
Gongyuan Zhao ◽  
Lei Sun ◽  
Yinyong Sun ◽  
...  
Keyword(s):  
High Temperature ◽  
Energy Density ◽  
Power Density ◽  
High Performance ◽  
High Energy ◽  
Porous Graphitic Carbon ◽  
Graphitic Carbon ◽  
Cycle Life ◽  
High Energy Density ◽  
Hierarchical Porous

Developing supercapacitors with high energy density without sacrificing the power density and cycle life has attracted enormous attention.

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.

Nb2O5 nanoparticles encapsulated in ordered mesoporous carbon matrix as advanced anode materials for Li ion capacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 71338-71344 ◽  
Author(s):  
Jingjie Wang ◽  
Hongsen Li ◽  
Laifa Shen ◽  
Shengyang Dong ◽  
Xiaogang Zhang
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Mesoporous Carbon ◽  
Anode Materials ◽  
High Performance ◽  
Carbon Matrix ◽  
High Energy ◽  
High Energy Density ◽  
Ordered Mesoporous ◽  
Li Ion

A high performance Li ion capacitor was constructed with Nb2O5/CMK-3 as anode and activated carbon as cathode, which demonstrated high energy density and power density benefit from the combination of the merits of batteries and supercapacitors.

Large-Scale and Low-Cost Motivation of Nitrogen-Doped Commercial Activated Carbon for High-Energy-Density Supercapacitor

2019 ◽  
Vol 2 (6) ◽  
pp. 4234-4243 ◽  
Author(s):  
Shuai Zhang ◽  
Xiaoze Shi ◽  
Xuecheng Chen ◽  
Dengsong Zhang ◽  
Xianjie Liu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Large Scale ◽  
Low Cost ◽  
High Energy ◽  
High Energy Density ◽  
Nitrogen Doped
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