Robust graphene composite films for multifunctional electrochemical capacitors with an ultrawide range of areal mass loading toward high-rate frequency response and ultrahigh specific capacitance

2018 ◽  
Vol 11 (3) ◽  
pp. 559-565 ◽  
Author(s):  
Miao Zhang ◽  
Xiaowen Yu ◽  
Hongyun Ma ◽  
Wencheng Du ◽  
Liangti Qu ◽  
...  
Keyword(s):  
Frequency Response ◽  
Specific Capacitance ◽  
Composite Films ◽  
Electrochemical Capacitors ◽  
High Rate ◽  
Mass Loading ◽  
Graphene Composite ◽  
Rate Frequency

Flexible electrochemical capacitors (ECs) with an ultrawide range of areal mass loading realize high-rate frequency response and ultrahigh specific capacitance.

Biomass-derived interconnected carbon nanoring electrochemical capacitors with high performance in both strongly acidic and alkaline electrolytes

2017 ◽  
Vol 5 (1) ◽  
pp. 181-188 ◽  
Author(s):  
Xianjun Wei ◽  
Yongbin Li ◽  
Shuyan Gao
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Electrochemical Capacitors ◽  
High Rate ◽  
Alkaline Electrolytes

The match between sustainable electrode materials and electrolytes is the key to achieve high-rate electrochemical capacitors.

scholarly journals Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber-Shaped Supercapacitors

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Xiaona Wang ◽  
Zhenyu Zhou ◽  
Zhijian Sun ◽  
Jinho Hah ◽  
Yagang Yao ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
High Performance ◽  
High Specific Capacitance ◽  
Superior Performance ◽  
High Mass ◽  
Mass Loading ◽  
Energy Storage Devices ◽  
Free Standing ◽  
Cell Potential

Abstract Coaxial fiber-shaped supercapacitors are a promising class of energy storage devices requiring high performance for flexible and miniature electronic devices. Yet, they are still struggling from inferior energy density, which comes from the limited choices in materials and structure used. Here, Zn-doped CuO nanowires were designed as 3D framework for aligned distributing high mass loading of MnO2 nanosheets. Zn could be introduced into the CuO crystal lattice to tune the covalency character and thus improve charge transport. The Zn–CuO@MnO2 as positive electrode obtained superior performance without sacrificing its areal and gravimetric capacitances with the increasing of mass loading of MnO2 due to 3D Zn–CuO framework enabling efficient electron transport. A novel category of free-standing asymmetric coaxial fiber-shaped supercapacitor based on Zn0.11CuO@MnO2 core electrode possesses superior specific capacitance and enhanced cell potential window. This asymmetric coaxial structure provides superior performance including higher capacity and better stability under deformation because of sufficient contact between the electrodes and electrolyte. Based on these advantages, the as-prepared asymmetric coaxial fiber-shaped supercapacitor exhibits a high specific capacitance of 296.6 mF cm−2 and energy density of 133.47 μWh cm−2. In addition, its capacitance retention reaches 76.57% after bending 10,000 times, which demonstrates as-prepared device’s excellent flexibility and long-term cycling stability.

Achieving ultrahigh volumetric performance of graphene composite films by an outer–inner dual space utilizing strategy

2020 ◽  
Vol 8 (19) ◽  
pp. 9661-9669 ◽  
Author(s):  
Cong Huang ◽  
Qunli Tang ◽  
Qiushui Feng ◽  
Yanhua Li ◽  
Yali Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Dual Space ◽  
Composite Films ◽  
Oxide Composite ◽  
Graphene Composite ◽  
Reduced Graphene

An outer–inner dual space utilizing strategy is reported for the fabrication of an ultrahigh volumetric performance polydopamine-coated dopamine/reduced graphene oxide composite film.

scholarly journals Tailoring of Aqueous-Based Carbon Nanotube–Nanocellulose Films as Self-Standing Flexible Anodes for Lithium-Ion Storage

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 655 ◽  
Author(s):  
Hoang Kha Nguyen ◽  
Jaehan Bae ◽  
Jaehyun Hur ◽  
Sang Joon Park ◽  
Min Sang Park ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
High Surface ◽  
High Surface Area ◽  
Composite Films ◽  
Rate Capability ◽  
Morphological Characteristics ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
High Rate ◽  
Voltage Profile

An easy and environmentally friendly method was developed for the preparation of a stabilized carbon nanotube–crystalline nanocellulose (CNT–CNC) dispersion and for its deposition to generate self-standing CNT–CNC composite films. The composite films were carbonized at different temperatures of 70 °C, 800 °C, and 1300 °C. Structural and morphological characteristics of the CNT–CNC films were investigated by X-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM), which revealed that the sample annealed at 800 °C (CNT–CNC800) formed nano-tree networks of CNTs with a high surface area (1180 m2·g−1) and generated a conductive CNC matrix due to the effective carbonization. The carbonized composite films were applied as anodes for lithium-ion batteries, and the battery performance was evaluated in terms of initial voltage profile, cyclic voltammetry, capacity, cycling stability, and current rate efficiency. Among them, the CNT–CNC800 anode exhibited impressive electrochemical performance by showing a reversible capacity of 443 mAh·g−1 at a current density of 232 mA·g−1 after 120 cycles with the capacity retention of 89% and high rate capability.

scholarly journals Facile Mechanochemical Synthesis of Nickel/Graphene Oxide Nanocomposites with Unique and Tunable Morphology: Applications in Heterogeneous Catalysis and Supercapacitors

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 486 ◽  
Author(s):  
Mayakrishnan Gopiraman ◽  
Somasundaram Saravanamoorthy ◽  
Dian Deng ◽  
Andivelu Ilangovan ◽  
Ick Soo Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Specific Capacitance ◽  
Preparation Method ◽  
High Rate ◽  
Ni Nanoparticles ◽  
Graphene Nanocomposites ◽  
Factual Content ◽  
Tunable Morphology ◽  
Defective Sites

In this study, a very simple and highly effective mechanochemical preparation method was developed for the preparation of Ni nanoparticles supported graphene oxide (GO) nanocomposites (Ni/GO, where Ni is a composition of Ni(OH)2, NiOOH, NiO, Ni2O3 and NiO2), 3 wt% NiO/GO (Ni/GO-1) and 8 wt% NiO/GO(Ni/GO-2). The developed method is not only very simple and efficient, but also, the morphology of Ni/GO nanocomposites can be tuned by simply varying the metal loading. Morphology and specific surface area of the resultant Ni/GO nanocomposites were investigated by mean of AFM, HR-TEM and BET. Chemical sate and factual content of Ni in Ni/GO-1 and Ni/GO-2, and the presence of defective sites in Ni-nanocomposites were investigated in detail. To our delight, the prepared Ni/GO-2 demonstrated superior catalytic activity toward the reduction of 2- and 4-nitrophenol in water with high rate constant (kapp) of 35.4 × 10−3 s−1. To the best of our knowledge, this is the best efficient Ni-based graphene nanocomposites for the reduction of 2- and 4-NP reported to date. The Ni/GO-1 and Ni/GO-2 demonstrated an excellent reusability; no loss in its catalytic activity was noticed, even after 10th cycle. Surprisingly the Ni/GO-2 as electrode material exhibited an excellent specific capacitance of 461 F/g in 6 M KOH at a scan rate of 5 mV. Moreover, the Ni/GO nanocomposites were found to possess poor electrical resistance and high stability (no significant change in the specific capacitance even after 1000 cycles).

Ti3C2Tx MXene-graphene composite films for wearable strain sensors featured with high sensitivity and large range of linear response

Nano Energy ◽  
2019 ◽  
Vol 66 ◽  
pp. 104134 ◽  
Author(s):  
Yina Yang ◽  
Zherui Cao ◽  
Peng He ◽  
Liangjing Shi ◽  
Guqiao Ding ◽  
...  
Keyword(s):  
Linear Response ◽  
Large Range ◽  
Composite Films ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Graphene Composite
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