Embedding Co2P nanoparticles in Cu doping carbon fibers for Zn-Air batteries and supercapacitors

Abstract Developing highly efficient and non-precious materials for Zn-air batteries (ZABs) and supercapacitors (SCs) are still crucial and challenging. Herein, electronic reconfiguration and introducing conductive carbon-based materials are simultaneously conducted to enhance the ZABs and SCs performance of Co2P. We develop a simple and efficient electrospinning technology followed by carbonization process to synthesize embedding Co2P nanoparticles in Cu doping carbon nanofibers (Cu-Co2P/CNFs). As a result, the 7% Cu-Co2P/CNFs presents high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity. (half-wave potential of 0.792 V for ORR, overpotential of 360 mV at 10 mA cm-2 for OER). ZABs that employed 7% Cu-Co2P/CNFs and acetylene black at a mass ratio of 1:2 as the cathode electrocatalyst exhibit a power density of 230 mW cm-2 and excellent discharge-charge reversibility of 80 h. In addition, the 7% Cu-Co2P/CNFs show the specific capacitance of 558 F g-1 at 1 A g-1. Moreover, the asymmetric supercapacitor (ASC) is assembled applying 7% Cu-Co2P/CNFs electrode and pure CNFs, which exhibits a high energy density (25.9 Wh kg-1), exceptional power density (217.5 kW kg-1) and excellent cycle stability (96.6% retention after 10,000 cycles). This work may provide an effective way to prepared Co2P based materials for ZABs and SCs applications.

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Three-dimensional Co3O4@C@Ni3S2 sandwich-structured nanoneedle arrays: towards high-performance flexible all-solid-state asymmetric supercapacitors

Journal of Materials Chemistry A ◽

10.1039/c5ta03469h ◽

2015 ◽

Vol 3 (31) ◽

pp. 16150-16161 ◽

Cited By ~ 142

Author(s):

Dezhi Kong ◽

Chuanwei Cheng ◽

Ye Wang ◽

Jen It Wong ◽

Yaping Yang ◽

...

Keyword(s):

Activated Carbon ◽

Solid State ◽

High Performance ◽

Three Dimensional ◽

Negative Electrode ◽

High Energy ◽

High Energy Density ◽

Asymmetric Supercapacitor ◽

Cycle Stability ◽

Asymmetric Supercapacitors

A novel asymmetric supercapacitor composed of Co3O4@C@Ni3S2 NNAs as the positive electrode and activated carbon (AC) as the negative electrode can deliver a high energy density and excellent long cycle stability.

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A high energy density all-solid-state asymmetric supercapacitor based on MoS2/graphene nanosheets and MnO2/graphene hybrid electrodes

Journal of Materials Chemistry A ◽

10.1039/c6ta03474h ◽

2016 ◽

Vol 4 (29) ◽

pp. 11264-11275 ◽

Cited By ~ 113

Author(s):

Xue Yang ◽

Hao Niu ◽

He Jiang ◽

Qian Wang ◽

Fengyu Qu

Keyword(s):

Solid State ◽

Energy Density ◽

Power Density ◽

Graphene Nanosheets ◽

High Energy ◽

High Energy Density ◽

Asymmetric Supercapacitor ◽

Positive Electrodes

An asymmetric supercapacitor with high energy density is designed using flower-like MoS2 and MnO2 grown on graphene nanosheets as the negative and positive electrodes, respectively. The device exhibits a high energy density of 78.9 W h kg−1 at a power density of 284.1 W kg−1.

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Hollow NiCo2S4 nanotube arrays grown on carbon textile as a self-supported electrode for asymmetric supercapacitors

RSC Advances ◽

10.1039/c5ra24068a ◽

2016 ◽

Vol 6 (12) ◽

pp. 9950-9957 ◽

Cited By ~ 34

Author(s):

Liang Hao ◽

Laifa Shen ◽

Jie Wang ◽

Yunling Xu ◽

Xiaogang Zhang

Keyword(s):

Energy Density ◽

Power Density ◽

High Power ◽

High Energy ◽

High Energy Density ◽

Nanotube Arrays ◽

Asymmetric Supercapacitor ◽

High Power Density ◽

Asymmetric Supercapacitors

We developed an asymmetric supercapacitor using NiCo2S4 nanotube arrays grown on carbon textile, achieving a high energy density (∼40.1 W h kg−1 at 451 W kg−1), a high power density (∼4725 W kg−1 at 21 W h kg−1) and excellent cyclability.

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Fabrication of hollow nanorod electrodes based on RuO2//Fe2O3 for an asymmetric supercapacitor

Dalton Transactions ◽

10.1039/c8dt00740c ◽

2018 ◽

Vol 47 (23) ◽

pp. 7747-7753 ◽

Cited By ~ 17

Author(s):

Qiufan Wang ◽

Xiao Liang ◽

Yun Ma ◽

Daohong Zhang

Keyword(s):

Energy Density ◽

Power Density ◽

High Power ◽

Negative Electrode ◽

High Energy ◽

Positive Electrode ◽

High Energy Density ◽

Asymmetric Supercapacitor ◽

High Power Density ◽

High Capacitance

A novel type of asymmetric supercapacitor was fabricated by assembling a RuO2 positive electrode and a Fe2O3 negative electrode. Full cells are constructed and show a high capacitance of 4.9 F cm−3, a high energy density of 1.5 mW h cm−3 and a high power density of 9.1 mW cm−3.

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In situ grown nickel selenide on graphene nanohybrid electrodes for high energy density asymmetric supercapacitors

Nanoscale ◽

10.1039/c8nr06345a ◽

2018 ◽

Vol 10 (43) ◽

pp. 20414-20425 ◽

Cited By ~ 208

Author(s):

Balakrishnan Kirubasankar ◽

Vignesh Murugadoss ◽

Jing Lin ◽

Tao Ding ◽

Mengyao Dong ◽

...

Keyword(s):

Energy Density ◽

Power Density ◽

High Energy ◽

High Energy Density ◽

Asymmetric Supercapacitor ◽

Asymmetric Supercapacitors

A NiSe–G∥AC asymmetric supercapacitor with both pseudocapacitance and EDLC mechanisms provides an energy density of 50.1 W h kg−1 and a power density of 816 W kg−1.

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MoO2 Nanoparticles Confined in N, P-codoped Graphene Aerogels with Excellent Pseudocapacitance Performance

Canadian Journal of Chemistry ◽

10.1139/cjc-2020-0283 ◽

2020 ◽

Author(s):

Jianfa Chen ◽

Tianxiang Jin ◽

Hangchun Deng ◽

Jie Huang ◽

Guangyuan Ren ◽

...

Keyword(s):

Energy Density ◽

Synergistic Effect ◽

Power Density ◽

High Specific Capacitance ◽

High Energy ◽

High Energy Density ◽

Mass Loading ◽

Cycle Stability ◽

Graphene Aerogels ◽

Symmetric Supercapacitor

In this work, MoO2@NPGA nanocomposites were successfully prepared via a simple hydrothermal and calcination route.The as-prepared MoO2@NPGA composites exhibit a synergistic effect between MoO2 and N, P codoped graphene aerogels, which can significantly improve the electrochemical performance of the MoO2@NPGA electrodes. Moreover, the results also proved that the mass loading of MoO2 has a huge effect on the electrochemical properties of MoO2@NPGA composites. With an appropriate amount of MoO2, the MoO2@NPGA composite shows a high specific capacitance (335 F g-1 at 1 A g-1) and excellent cycle stability (capacitance remains at 88% after 6000 cycles). Futhermore, the assembled symmetric supercapacitor displays a high energy density of 23.75 W h kg-1 at a power density of 300 W kg-1 and can maintain an energy density of 17.1 W h kg−1 when the power density reaches up to 6005 W kg−1.

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Na0.76V6O15/Activated Carbon Hybrid Cathode for High-Performance Lithium-Ion Capacitors

Materials ◽

10.3390/ma14010122 ◽

2020 ◽

Vol 14 (1) ◽

pp. 122

Author(s):

Renwei Lu ◽

Xiaolong Ren ◽

Chong Wang ◽

Changzhen Zhan ◽

Ding Nan ◽

...

Keyword(s):

Activated Carbon ◽

Energy Density ◽

Power Density ◽

Cathode Materials ◽

Low Cost ◽

Lithium Ion ◽

High Energy ◽

Cycling Stability ◽

High Energy Density ◽

Artificial Graphite

Lithium-ion hybrid capacitors (LICs) are regarded as one of the most promising next generation energy storage devices. Commercial activated carbon materials with low cost and excellent cycling stability are widely used as cathode materials for LICs, however, their low energy density remains a significant challenge for the practical applications of LICs. Herein, Na0.76V6O15 nanobelts (NaVO) were prepared and combined with commercial activated carbon YP50D to form hybrid cathode materials. Credit to the synergism of its capacitive effect and diffusion-controlled faradaic effect, NaVO/C hybrid cathode displays both superior cyclability and enhanced capacity. LICs were assembled with the as-prepared NaVO/C hybrid cathode and artificial graphite anode which was pre-lithiated. Furthermore, 10-NaVO/C//AG LIC delivers a high energy density of 118.9 Wh kg−1 at a power density of 220.6 W kg−1 and retains 43.7 Wh kg−1 even at a high power density of 21,793.0 W kg−1. The LIC can also maintain long-term cycling stability with capacitance retention of approximately 70% after 5000 cycles at 1 A g−1. Accordingly, hybrid cathodes composed of commercial activated carbon and a small amount of high energy battery-type materials are expected to be a candidate for low-cost advanced LICs with both high energy density and power density.

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Novel Lithium-Ion Capacitor Based on a NiO-rGO Composite

Materials ◽

10.3390/ma14133586 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3586

Author(s):

Qi An ◽

Xingru Zhao ◽

Shuangfu Suo ◽

Yuzhu Bai

Keyword(s):

Energy Storage ◽

Energy Density ◽

Power Density ◽

High Power ◽

Specific Capacity ◽

Lithium Ion ◽

High Energy ◽

Cycle Life ◽

High Energy Density ◽

Lithium Ion Capacitor

Lithium-ion capacitors (LICs) have been widely explored for energy storage. Nevertheless, achieving good energy density, satisfactory power density, and stable cycle life is still challenging. For this study, we fabricated a novel LIC with a NiO-rGO composite as a negative material and commercial activated carbon (AC) as a positive material for energy storage. The NiO-rGO//AC system utilizes NiO nanoparticles uniformly distributed in rGO to achieve a high specific capacity (with a current density of 0.5 A g−1 and a charge capacity of 945.8 mA h g−1) and uses AC to provide a large specific surface area and adjustable pore structure, thereby achieving excellent electrochemical performance. In detail, the NiO-rGO//AC system (with a mass ratio of 1:3) can achieve a high energy density (98.15 W h kg−1), a high power density (10.94 kW kg−1), and a long cycle life (with 72.1% capacity retention after 10,000 cycles). This study outlines a new option for the manufacture of LIC devices that feature both high energy and high power densities.

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