scholarly journals Asymmetric supercapacitor of functionalised electrospun carbon fibers/poly(3,4-ethylenedioxythiophene)/manganese oxide//activated carbon with superior electrochemical performance

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Muhammad Amirul Aizat Mohd Abdah ◽  
Nur Hawa Nabilah Azman ◽  
Shalini Kulandaivalu ◽  
Yusran Sulaiman
Keyword(s):  
Activated Carbon ◽  
Manganese Oxide ◽  
High Performance ◽  
Storage System ◽  
Negative Electrode ◽  
Energy Storage System ◽  
Charge Transfer Resistance ◽  
Potential Candidate ◽  
Transfer Resistance ◽  
Operating Potential

AbstractAsymmetric supercapacitors (ASC) have shown a great potential candidate for high-performance supercapacitor due to their wide operating potential which can remarkably enhance the capacitive behaviour. In present work, a novel positive electrode derived from functionalised carbon nanofibers/poly(3,4-ethylenedioxythiophene)/manganese oxide (f-CNFs/PEDOT/MnO2) was prepared using a multi-step route and activated carbon (AC) was fabricated as a negative electrode for ASC. A uniform distribution of PEDOT and MnO2 on f-CNFs as well as porous granular of AC are well-observed in FESEM. The assembled f-CNFs/PEDOT/MnO2//AC with an operating potential of 1.6 V can achieve a maximum specific capacitance of 537 F/g at a scan rate of 5 mV/s and good cycling stability (81.06% after cycling 8000 times). Furthermore, the as-prepared ASC exhibited reasonably high specific energy of 49.4 Wh/kg and low charge transfer resistance (Rct) of 2.27 Ω, thus, confirming f-CNFs/PEDOT/MnO2//AC as a promising electrode material for the future energy storage system.

Hydrothermal synthesis MoO3@CoMoO4 hybrid as an anode material for high performance lithium rechargeable batteries

2019 ◽  
Vol 12 (01) ◽  
pp. 1850104 ◽  
Author(s):  
Jinggao Wu ◽  
Qi Lai ◽  
Canyu Zhong
Keyword(s):  
Current Density ◽  
High Performance ◽  
High Current Density ◽  
Rate Capability ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Rechargeable Batteries ◽  
Transfer Resistance ◽  
Lithium Rechargeable Batteries ◽  
One Step

MoO3@CoMoO4 hybrid is fabricated by a facile one-step hydrothermal method and is used as anode for lithium-ion battery (LIB). Compared to pristine MoO3, galvanostatic charge–discharge tests show that the hybrid electrode delivered a remarkable rate capability of 586.69[Formula: see text]mAh[Formula: see text]g[Formula: see text] at the high current density of 1000[Formula: see text]mA[Formula: see text]g[Formula: see text] and a greatly enhanced cyclic capacity of 887.36[Formula: see text]mA[Formula: see text]h[Formula: see text]g[Formula: see text] after 140 cycles at the current density of 200[Formula: see text]mA[Formula: see text]g[Formula: see text] (with capacity retention, 85.3%). The superior electrochemical properties could be ascribed to the synergistic effect of MoO3 and CoO nanostructure that results in the lower charge transfer resistance and the higher Li[Formula: see text] diffusion coefficient, thus leading to high performance Li[Formula: see text] reversibility storage.

Electrochemical Performance of Lithium-Ion Hybrid Supercapacitors based on Activated Carbon and Nanoplatelet Li4Ti5O12 Insertion Electrode Synthesized by Nanoscission Technique

2015 ◽  
Vol 1740 ◽  
Author(s):  
Sandeep Singh ◽  
Alok C Rastogi ◽  
Fredrick Omenya ◽  
M Stanley Whittingham ◽  
Archit Lal ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electrochemical Performance ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Electrode Polarization ◽  
Hybrid Supercapacitor ◽  
Transfer Resistance ◽  
Hybrid Supercapacitors ◽  
Current Change ◽  
Kinetic Effects

ABSTRACTElectrochemical performance of hybrid supercapacitor (HSC) utilizing surface sculpted Li4Ti5O12 (LTO) insertion electrode having nanoplatelet-like morphology and activated carbon (AC) electrode is investigated for energy storage application. Cyclic voltammetry (CV) at variable scan rates 0.5 to 60 mV.s-1 in the 0-3.2 V range show pseusocapacitive behavior and fast rate of current change indicating rapid Faradaic kinetics. Nyquist impedance study show charge transfer resistance due to kinetic effects of electron transfer and Li+ de-intercalation process at the LTO anode. Low capacity (0.2 C-1C) charge-discharge (CD) curves show high Coulomb efficiency with marginal reduction at high 5-10 C rates due to irreversibility of adsorbed PF6 anions at the electrolyte-AC interface. Galvanostatic CD cycling tests over 50 cycles at different C-rates show decline in storage capacity due to electrode polarization effects. Reduction, broadening and shift of the Raman line at 678 cm-1 from Ti-O bonds in TiO6 octahedra after cycling indicates Li insertion reactions in functioning of hybrid supercapacitor. The hybrid supercapacitor cells have shown energy density, 29 Wh.kg-1 and power density, 350 W.kg-1.

Graphene-Wrapped FeOOH Nanorods with Enhanced Performance as Lithium-Ion Battery Anode

NANO ◽  
2020 ◽  
pp. 2150005
Author(s):  
Meng Sun ◽  
Zhipeng Cui ◽  
Huanqing Liu ◽  
Sijie Li ◽  
Qingye Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Extraction Process ◽  
Hybrid Structure ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Distinctive Structure

FeOOH nanorods (NRs) wrapped by reduced graphene oxide (rGO) were fabricated using a facile solvothermal method. When used as anode materials for lithium-ion batteries (LIBs), the FeOOH NRs/rGO composites show a higher capacity (490[Formula: see text]mAh g[Formula: see text] after 100 cycles at a current density of 100[Formula: see text]mA g[Formula: see text] and better rate capability than pure FeOOH NRs. The enhanced electrochemical performance can be ascribed to the hybrid structure of FeOOH and rGO. On one hand, the introduction of rGO can improve electronic conductivity and reduce charge-transfer resistance for electrode materials. On the other hand, the distinctive structure (FeOOH NRs surrounded by flexible rGO) can effectively buffer large volume change during the Li[Formula: see text] insertion/extraction process. Our work provides a feasible strategy to obtain high-performance LIBs.

scholarly journals Facile Synthesis of FePS3 Nanosheets@MXene Composite as a High-Performance Anode Material for Sodium Storage

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yonghao Ding ◽  
Yu Chen ◽  
Na Xu ◽  
Xintong Lian ◽  
Linlin Li ◽  
...  
Keyword(s):  
Anode Material ◽  
High Performance ◽  
Storage System ◽  
Electronic Conductivity ◽  
Reversible Capacity ◽  
Energy Storage System ◽  
Sodium Ion ◽  
Cyclic Process ◽  
Excellent Property ◽  
Sodium Storage

AbstractSearching for advanced anode materials with excellent electrochemical properties in sodium-ion battery is essential and imperative for next-generation energy storage system to solve the energy shortage problem. In this work, two-dimensional (2D) ultrathin FePS3 nanosheets, a typical ternary metal phosphosulfide, are first prepared by ultrasonic exfoliation. The novel 2D/2D heterojunction of FePS3 nanosheets@MXene composite is then successfully synthesized by in situ mixing ultrathin MXene nanosheets with FePS3 nanosheets. The resultant FePS3 nanosheets@MXene hybrids can increase the electronic conductivity and specific surface area, assuring excellent surface and interfacial charge transfer abilities. Furthermore, the unique heterojunction endows FePS3 nanosheets@MXene composite to promote the diffusion of Na+ and alleviate the drastic change in volume in the cyclic process, enhancing the sodium storage capability. Consequently, the few-layered FePS3 nanosheets uniformly coated by ultrathin MXene provide an exceptional reversible capacity of 676.1 mAh g−1 at the current of 100 mA g−1 after 90 cycles, which is equivalent to around 90.6% of the second-cycle capacity (746.4 mAh g−1). This work provides an original protocol for constructing 2D/2D material and demonstrates the FePS3@MXene composite as a potential anode material with excellent property for sodium-ion batteries.

Design of an energy storage system with blended of Li-ion batteries for pure electric vehicle of high performance

2018 ◽  
Author(s):  
Sender Rocha dos Santos ◽  
Juliana C. M. S. Aranha ◽  
Fernando Augusto Cerri ◽  
Thiago Chiachio do Nascimento ◽  
Maria de Fátima Negreli Campos Rosolem ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electric Vehicle ◽  
High Performance ◽  
Storage System ◽  
Energy Storage System ◽  
Li Ion Batteries ◽  
Li Ion

A high-performance flexible and weavable asymmetric fiber-shaped solid-state supercapacitor enhanced by surface modifications of carbon fibers with carbon nanotubes

2016 ◽  
Vol 4 (46) ◽  
pp. 18164-18173 ◽  
Author(s):  
Xiaoyu Lu ◽  
Yang Bai ◽  
Ranran Wang ◽  
Jing Sun
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Solid State ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
High Performance ◽  
Negative Electrode ◽  
Surface Modifications ◽  
High Energy ◽  
Power Densities

A carbon fiber-based positive electrode enhanced by CNT modification with NiCo(OH)x and a negative electrode functionalized with activated carbon were prepared. The supercapacitor showed high energy and power densities.

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