scholarly journals Flexible Supercapacitor Electrodes Based on Carbon Cloth-Supported LaMnO3/MnO Nano-Arrays by One-Step Electrodeposition

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1676 ◽  
Author(s):  
Pianpian Ma ◽  
Na Lei ◽  
Bo Yu ◽  
Yongkun Liu ◽  
Guohua Jiang ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth ◽  
Supercapacitor Electrode ◽  
Cooperative Effects ◽  
Flexible Supercapacitor ◽  
Symmetric Supercapacitor ◽  
One Step ◽  
New Type

La-based perovskite-type oxide is a new type of supercapacitor electrode material with great potential. In the present study, LaMnO3/MnO (LMO/MnO) nano-arrays supported by carbon cloth are prepared via a simple one-step electrodeposition as flexible supercapacitor electrodes. The structure, deposit morphology of LMO/MnO, and the corresponding electrochemical properties have been investigated in detail. Carbon cloth-supported LMO/MnO electrode exhibits a specific capacitance of 260 F·g−1 at a current density of 0.5 A·g−1 in 0.5 M Na2SO4 aqueous electrolyte solution. The cooperative effects of LMO and MnO, as well as the uniform nano-array morphology contribute to the good electrochemical performance. In addition, a symmetric supercapacitor with a wide voltage window of 2 V is fabricated, showing a high energy density of 28.15 Wh·kg−1 at a power density of 745 W·kg−1. The specific capacitance drops to 65% retention after the first 500 cycles due to the element leaching effect and partial flaking of LMO/MnO, yet remains stable until 5000 cycles. It is the first time that La-based perovskite has been exploited for flexible supercapacitor applications, and further optimization is expected.

scholarly journals Fabrication of g-C3N4 Quantum Dots/MnCO3 Nanocomposite on Carbon Cloth for Flexible Supercapacitor Electrode

2020 ◽  
Vol 10 (21) ◽  
pp. 7927
Author(s):  
Di Liu ◽  
Seung Hyun Hur ◽  
Jin Suk Chung ◽  
Won Mook Choi
Keyword(s):  
Quantum Dots ◽  
Light Emitting Diode ◽  
Specific Capacity ◽  
Negative Electrode ◽  
Cycling Performance ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth ◽  
Supercapacitor Electrode ◽  
Flexible Supercapacitor

In this study, the nanocomposite of g-C3N4 quantum dots/MnCO3 on carbon cloth (q-MC//CC) is prepared via a simple hydrothermal method. The obtained q-MC//CC composite is employed for a flexible supercapacitor electrode. The g-C3N4 quantum dots could effectively improve the interface electrical conductivity and ion transportation of the MnCO3 electrode, which results in superior electrochemical performance. The q-MC//CC electrode delivers a high specific capacity of 1001 F·g−1 at a current density of 1 A·g−1 and a good cycling performance of 96% capacity retention after 5000 cycles. Moreover, an asymmetric flexible supercapacitor (ASC) is assembled with q-MC//CC and carbon cloth as a positive and negative electrode, respectively, which exhibits a high energy density of 27.1 Wh·kg−1 at a power density of 500 W·kg−1. In addition, the fabricated ASC device demonstrates the ability to power the light-emitting diode effectively under mechanical bending.

The porous ZnCo2O4 nanosheets arrays as a binder-free electrode for high performance flexible supercapacitor materials

2021 ◽  
Author(s):  
Jing Wang ◽  
Chen Wang ◽  
Shen Wang ◽  
Xiang Zhang ◽  
Xiangyang Jin ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth ◽  
Energy Storage Devices ◽  
Supercapacitor Electrode ◽  
Flexible Electrode ◽  
Flexible Supercapacitor ◽  
Binder Free

Abstract In this paper, the porous ZnCo2O4 nanosheets arrays (NAs)/carbon cloth (CC) were prepared for the first time as a binder-free anode by hydrothermal method. The anode electrode material shows multistage pore distribution and thus can provide numerous ways for the transport of ions and electrons. As a supercapacitor electrode, the flexible ZnCo2O4/CC electrode indicates a high specific capacitance (1790 F/g at the current density of 1 A/g), good rate performance, and excellent cycle properties (99.4% capacitance retention after 10000 cycles). Besides, the flexible electrode also displays good mechanical flexibility. The solid-state asymmetric flexible supercapacitor device was assembled taking the ZnCo2O4/CC electrode as the positive electrode and carbon nanotube (CNTs)/CC as the negative electrode. The asymmetric device delivers high energy density 47.1 Wh/Kg (power density 800 W/Kg) and power density 12000 W/Kg (energy density 28.3 Wh/Kg) with the potential window 0 V ~ 1.6 V. These results indicate the ZnCo2O4/CC flexible electrode with high electrochemical performance adjust for environmentally friendly and low-cost energy storage devices in the future.

β-NiMoO4 nanowire arrays grown on carbon cloth for 3D solid asymmetry supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (129) ◽  
pp. 107098-107104 ◽  
Author(s):  
Chuanshen Wang ◽  
Yi Xi ◽  
Chenguo Hu ◽  
Shuge Dai ◽  
Mingjun Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Power Density ◽  
High Energy ◽  
Nanowire Arrays ◽  
High Energy Density ◽  
Carbon Cloth ◽  
Maximum Power Density ◽  
Capacity Retention ◽  
3D Solid

A β-NiMoO4 NW supercapacitor lights one LED for 260 s and delivers a large specific capacitance (414.7 F g−1 at 0.25 A g−1), high energy density (36.86 W h kg−1), a maximum power density of 1100 W kg−1 and 65.96% capacity retention after 6000 cycles.

scholarly journals Graphene/polyaniline@carbon cloth composite as a high-performance flexible supercapacitor electrode prepared by a one-step electrochemical co-deposition method

RSC Advances ◽  
2017 ◽  
Vol 7 (13) ◽  
pp. 7688-7693 ◽  
Author(s):  
Lele Wen ◽  
Ke Li ◽  
Jingjing Liu ◽  
Yanshan Huang ◽  
Fanxing Bu ◽  
...  
Keyword(s):  
High Performance ◽  
Carbon Cloth ◽  
Deposition Method ◽  
Supercapacitor Electrode ◽  
Flexible Supercapacitor ◽  
Flexible Supercapacitors ◽  
One Step

A one-step electrochemical co-deposition method was used to prepare a graphene/polyaniline composite on carbon cloth for high-performance flexible supercapacitors.

scholarly journals One-Step Hydrothermal Synthesis of a CoTe@rGO Electrode Material for Supercapacitors

2021 ◽  
Author(s):  
Tianrui Wang ◽  
Yupeng Su ◽  
Mi Xiao ◽  
Meilian Zhao ◽  
Tingwu Zhao ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Power Density ◽  
Current Density ◽  
Electrode Material ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
One Step ◽  
Charge Discharge

AbstractCoTe@reduced graphene oxide (CoTe@rGO) electrode materials for supercapacitors were prepared by a one-step hydrothermal method in this paper. Compared with that of pure CoTe, the electrochemical performance of CoTe@rGO was significantly improved. The results showed that the optimal CoTe@rGO electrode material has a remarkably high specific capacitance of 810.6 F/g at a current density of 1 A/g. At 5 A/g, the synthesized material retained 77.2% of its initial capacitance even after 5000 charge/discharge cycles, thereby demonstrating good cycling stability. Moreover, even at a high current density of 20 A/g, the composite electrode retained 79.0% of its specific capacitance at 1 A/g, thus confirming its excellent rate performance. An asymmetric supercapacitor (ASC) with a wider potential window and higher energy density was assembled by using 3 M KOH as the electrolyte, the CoTe@rGO electrode as the positive electrode, and active carbon as the negative electrode. The operating voltage of the supercapacitor could be increased to 1.6 V, and its specific capacitance could reach 112.6 F/g at 1 A/g. The specific capacitance retention rate of the fabricated supercapacitor after 5000 charge/discharge cycles at 5 A/g was 87.1%, which confirms its excellent cycling stability. In addition, the ASC revealed a high energy density of 40.04 W·h/kg at a power density of 799.91 W/kg and a high power density of 4004.93 W/kg at an energy density of 33.43 W·h/kg. These results collectively show that CoTe@rGO materials have broad application prospects.

A self-supported hierarchical Co-MOF as a supercapacitor electrode with ultrahigh areal capacitance and excellent rate performance

2018 ◽  
Vol 54 (74) ◽  
pp. 10499-10502 ◽  
Author(s):  
Guilei Zhu ◽  
Hao Wen ◽  
Min Ma ◽  
Weiyi Wang ◽  
Lin Yang ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Rate Performance ◽  
Supercapacitor Electrode ◽  
Areal Capacitance

Hierarchical Co-MOF nanosheet-assembled hexagon-like microblocks serving as a supercapacitor electrode exhibits outstanding areal specific capacitance and Co-MOF/NF//AC achieves a high energy density of 1.7 mW h cm−2 at 4.0 mW cm−2.

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.

scholarly journals Hierarchical Ni2P@Ni(OH)2 Architectures Supported On Carbon Cloth As Battery-Type Electrodes For Hybrid Supercapacitors With Boosting Specific Capacitance and Cycle Stability

2021 ◽  
Author(s):  
Yingying Lan ◽  
Hongna Xing ◽  
Yan Zong ◽  
Yong Sun ◽  
Linxue Zhang ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Hierarchical Architecture ◽  
Carbon Cloth ◽  
Electrochemical Characteristics ◽  
Cycle Stability ◽  
Hybrid Supercapacitors ◽  
Nanosheet Arrays ◽  
High Electronic Conductivity

Abstract In this work, a novel binder-free electrode, in which three-dimensional porous Ni2P@Ni(OH)2 nanosheet arrays were in-situ grown on carbon cloth (CC), is rationally designed for supercapacitor applications. In comparison with Ni2P@CC, the Ni2P@Ni(OH)2@CC electrode represents superior electrochemical characteristics: the gravimetric capacitance and areal capacitance are boosted to be 632 C g-1 and 0.73 C cm-2 at 1 mA cm-2, about 2 and 2.7 times larger than those of Ni2P@CC (321 C g-1 and 0.27 C cm-2), respectively; the rate capability is improved to be 63.3% from 1 to 10 mA cm-2, about 1.5 times larger than Ni2P@CC (42.9%); the cycle stability is enhanced to be 81.4% after 1000 cycles, about 1.6 times larger than Ni2P/CC (51.8%). The assembly Ni2P@Ni(OH)2@CC//AC hybrid supercapacitor device shows high energy density of 23.5 Wh kg-1 at a power density of 1158.0 W kg-1 and good cycling stability of 75.2% maintenance after 5000 cycles. Benefiting from the combined advantages of high electronic conductivity and large specific capacitance of Ni2P, superior anion exchanging/intercalating capacity of Ni(OH)2, excellent flexibility of carbon cloth and special hierarchical architecture with large surface area, the Ni2P@Ni(OH)2@CC electrode is promised to be a good candidate for supercapacitors.

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