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Flexible electrolyte

Leila Naderi, Saeed Shahrokhian
Wire-shaped micro-supercapacitors attracted extensive attentions in next-generation portable and wearable electronics, due to advantages of miniature size, lightweight and flexibility. Herein, NiMoO4 nanorods supported on Ni film coated Cu wire are successfully fabricated thorough direct deposition of Ni film onto Cu wire as the conductive substrate, followed by growth of the NiMoO4 nanorods on Ni film coated Cu wire substrate by means a hydrothermal annealing process. The prepared 3D, porous electrode demonstrates extremely high areal specific capacitance of 12...
February 7, 2019: Journal of Colloid and Interface Science
L Fekri Aval, M Ghoranneviss, G Behzadi Pour
In this study, the three structures of the symmetric paper supercapacitors based on the carbon nanotubes (CNTs), graphite nanoparticles (GNPs) and graphene electrodes have been fabricated. In the supercapacitors was used of polyvinyl alcohol (PVA)/phosphoric acid (H3 PO4 ) as a gel electrolyte and the BaTiO3 film as a separator film. The carbon nanomaterials, gel electrolyte surface, and electrode films were characterized by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The specific capacitance of the symmetric paper supercapacitors using charge-discharge technique and C-V curves at the voltage scan rates 20 mV/s and 150 mV/s have been investigated...
November 2018: Heliyon
Donghoon Song, Fazel Zare Bidoky, Ethan Secor, Mark C Hersam, C Daniel Frisbie
Freestanding ion gels (FIGs) provide unique opportunities for scalable, low-cost fabrication of flexible microsupercapacitors (MSCs). While conventional MSCs employ a distinct electrolyte and substrate, FIGs perform both functions, offering new possibilities for device integration and multifunctionality while maintaining high performance. Here, a capillarity-driven printing method is demonstrated to manufacture high-precision graphene electrodes on FIGs for MSCs. This method achieves excellent self-alignment and resolution (width: 50 μm, device footprint: <1 mm2), 100% fabrication yield (48/48 devices), and is readily generalized to alternative electrode materials including multi-walled carbon nanotubes (MWCNTs)...
February 13, 2019: ACS Applied Materials & Interfaces
Weiyang Yang, Allison Broski, Jiajia Wu, Qi Hua Fan, Wen Li
This paper reports on electrochemical and optical characteristics of flexible, transparent microelectrodes, which consist of thin poly-(3, 4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) spun onto indium-tin-oxide (ITO) electrodes for potential applications in biomedical optoelectronic devices. Although PEDOT:PSS/ITO combined films have been extensively investigated for applications in optical devices, such as solar cells and LEDs, PEDOT:PSS/ITO films for use in electrophysiological recording have not been well-characterized yet...
July 2018: IEEE Transactions on Nanotechnology
Hao Li, Zhiqiang Feng, Kang Zhao, Zihao Wang, Jiahang Liu, Jie Liu, Hongzan Song
A novel type of chemically crosslinked liquid crystalline nanocomposite ionogel electrolyte based on poly(ionic liquid) (PIL) with superior ionic conductivity and high anisotropic conductivity was designed and synthesized using the in situ photopolymerization of sheared soft ionogels containing charged halloysite nanotubes (HNTs) and ionic liquid monomers. The oriented structure was investigated using scanning electron microscopy (SEM) and small-angle X-ray scattering (SAXS). The chemically crosslinked backbone of the PIL and the addition of HNTs endowed the flexible ionogels with a combined very high modulus (up to 26...
February 11, 2019: Nanoscale
Deepak S Patil, Manisha Konale, Tomas Wagner
Impedance spectroscopy is a valuable tool for the analysis of the ionic conductivity of both solid and liquid state materials. Chalcogenide glasses are well known for their high ionic conductivity nature and wide compositional flexibility. As the GeSbSe material has high glass forming ability, it is expected that the materials can be doped with a high amount of foreign element (in the present case Ag). For all of these reasons, the GeSbSe materials can be expected as a potential candidate for solid state electrolyte for ionic batteries...
February 2019: Data in Brief
Yang Yang, Min Zhao, Hongbo Geng, Yufei Zhang, Yanxiong Fang, Cheng Chao Li, Jinbao Zhao
The use of Li metal as anodes for Li-based batteries has attracted considerable attention due to its ultrahigh energy density. However, Li dendrites formation, uneven deposition, and huge volume changes hinder their reliable implementation. Particularly, these issues are much more severe in the commercial carbonate-based electrolyte than that in the ether-based electrolyte. Herein, a rational design of three-dimensional graphene/Ag aerogel (3D G-Ag aerogel) is proposed for Li metal anodes with long cycle life in carbonate-based electrolyte...
February 5, 2019: Chemistry: a European Journal
Jingqi Liu, Yi Li, Sheng Yong, Sasikumar Arumugam, Steve Beeby
Previously, textile dye sensitised solar cells (DSSCs) woven using photovoltaic (PV) yarns have been demonstrated but there are challenges in their implementation arising from the mechanical forces in the weaving process, evaporation of the liquid electrolyte and partially shaded cells area, which all reduce the performance of the cell. To overcome these problems, this paper proposes a novel fabrication process for a monolithic-structured solid-state dye sensitized solar cell (ssDSSC) on textile using all solution based processes...
February 4, 2019: Scientific Reports
Francesca Leonardi, Adrián Tamayo, Stefano Casalini, Marta Mas-Torrent
Understanding the physics behind the operational mechanism of Electrolyte-Gated Organic Field-Effect Transistors (EGOFETs) is of paramount importance for the correct interpretation of the device response. Here, we report the systematic functionalization of the gate electrode of an EGOFET with self-assembled monolayers with a variety of dipolar moments showing that both the chemical nature and the monolayer density influence the electrical characteristics of the device.
August 1, 2018: RSC Advances
Pan Xiang, Xianfei Chen, Beibei Xiao, Zhiming M Wang
The rapid development of wearable electronics has revealed an urgent need of low-cost, high-flexible, and high-capacity power sources. In this sense, emerging rechargeable potassium-ion batteries (KIBs) are promising candidate owing to their abundant resources, low-cost and lower redox potential in non-aqueous electrolytes compared to lithium-ion batteries. However, the fabrication of flexible KIBs remains highly challenging because of the lack of high-performance flexible electrode materials. In this work, we investigated the mechanical properties and electrochemical performance of recently developed hydrogen boride (BH) monolayer as a high-performance anode material based on density functional theory (DFT) formalism...
February 1, 2019: ACS Applied Materials & Interfaces
José Tiago Carvalho, Viorel Dubceac, Paul Grey, Inês Cunha, Elvira Fortunato, Rodrigo Martins, Andre Clausner, Ehrenfried Zschech, Luís Pereira
Fully printed and flexible inorganic electrolyte gated transistors (EGTs) on paper with a channel layer based on an interconnected zinc oxide (ZnO) nanoparticle matrix are reported in this work. The required rheological properties and good layer formation after printing are obtained using an eco-friendly binder such as ethyl cellulose (EC) to disperse the ZnO nanoparticles. Fully printed devices on glass substrates using a composite solid polymer electrolyte as gate dielectric exhibit saturation mobility above 5 cm² V-1 s-1 after annealing at 350 °C...
January 30, 2019: Nanomaterials
Hui Pan, Zhibin Cheng, Hong Zhong, Ruihu Wang, Xiaoju Li
Foldable lithium-sulfur (Li-S) batteries have captured considerable interest in advanced flexible energy storage systems. However, sulfur utilization, cycling stability and mechanical durability are still not satisfactory for flexible batteries with high sulfur loadings. Herein, we present one type of new freestanding electrode materials derived from thiourea-based covalent organic gel (COG). COG can accommodate high loading of carbon nanotubes (CNTs) and sulfur with the concomitant formation of an embedded conductive CNTs network...
January 31, 2019: ACS Applied Materials & Interfaces
Hui Duan, Min Fan, Wan-Ping Chen, Jin-Yi Li, Peng-Fei Wang, Wen-Peng Wang, Ji-Lei Shi, Ya-Xia Yin, Li-Jun Wan, Yu-Guo Guo
In response to the call for safer high-energy-density storage systems, high-voltage solid-state Li metal batteries have attracted extensive attention. Therefore, solid electrolytes are required to be stable against both Li anode and high-voltage cathodes; nevertheless, the requirements still cannot be completely satisfied. Herein, a heterogeneous multilayered solid electrolyte (HMSE) is proposed to broaden electrochemical window of solid electrolytes to 0-5 V, through different electrode/electrolyte interfaces to overcome the interfacial instability problems...
January 31, 2019: Advanced Materials
Oliviero Andreussi, Nicholas Georg Hormann, Francesco Nattino, Giuseppe Fisicaro, Stefan Goedecker, Nicola Marzari
Continuum models to handle solvent and electrolyte effects in an effective way have a long tradition in quantum-chemistry simulations and are nowadays also being introduced in computational condensed-matter and materials simulations. A key ingredient of continuum models is the choice of the solute cavity, i.e. the definition of the sharp or smooth boundary between the regions of space occupied by the quantum-mechanical (QM) system and the continuum embedding environment. The cavity, which should really reflect the region of space accessible to the degrees of freedom of the environmental components (the solvent), is usually defined by an exclusion approach in terms of the degrees of freedom of the system (the solute); typically the atomic position of the QM system or its electronic density...
January 25, 2019: Journal of Chemical Theory and Computation
Xue Zhang, Shuo Wang, Chuanjiao Xue, Chengzhou Xin, Yuanhua Lin, Yang Shen, Liangliang Li, Ce-Wen Nan
Polymer-based electrolytes have attracted ever-increasing attention for all-solid-state lithium (Li) metal batteries due to their ionic conductivity, flexibility, and easy assembling into batteries, and are expected to overcome safety issues by replacing flammable liquid electrolytes. However, it is still a critical challenge to effectively block Li dendrite growth and improve the long-term cycling stability of all-solid-state batteries with polymer electrolytes. Here, the interface between novel poly(vinylidene difluoride) (PVDF)-based solid electrolytes and the Li anode is explored via systematical experiments in combination with first-principles calculations, and it is found that an in situ formed nanoscale interface layer with a stable and uniform mosaic structure can suppress Li dendrite growth...
January 25, 2019: Advanced Materials
Jiajian Gao, Cong-Qiao Xu, Sung-Fu Hung, Wei Liu, Weizheng Cai, Zhiping Zeng, Chunmiao Jia, Hao Ming Chen, Hai Xiao, Jun Li, Yanqiang Huang, Bin Liu
Oxygen electrochemistry plays a critical role in clean energy technologies such as fuel cells and electrolyzers, but the oxygen evolution reaction (OER) badly restricts the efficiency of these devices due to its slow kinetics. Here we show that via incorporating lithium ion into iridium oxide, the thus obtained amorphous iridium oxide (Li-IrOx) demonstrates outstanding water oxidation activity with OER current density of 10 mA/cm2 at 270 mV overpotential for 10 hours of continuous operation in acidic electrolyte...
January 23, 2019: Journal of the American Chemical Society
Addisu Alemayehu Assegie, Cheng-Chu Chung, Meng-Che Tsai, Wei-Nien Su, Chun-Wei Chen, Bing-Joe Hwang
The will to circumvent capacity fading, Li dendrite formation, and low coulombic efficiency in anode-free Li-metal batteries (AFLMBs) requires a radical change in the science underpinning new materials discovery, battery design, and understanding electrode interfaces. Herein, a Cu current collector formed with ultrathin multilayer graphene grown via chemical vapor deposition (CVD) was used as an artificial layer to stabilize the electrode interface and sandwich-deposited Li with Cu. A multilayer graphene film's superior strength, chemical stability, and flexibility make it an excellent choice to modify a Cu electrode...
January 23, 2019: Nanoscale
Sathish Deshagani, Xinhua Liu, Billy Wu, Melepurath Deepa
Binder free flexible symmetric supercapacitors are developed with nickel cobaltite micro-flower coated poly(3,4-ethylenedioxypyrrole) (NiCo2O4@PEDOP) hybrid electrodes. The free standing films of carbon nano-fibers (CNFs), synthesized by electrospinning, were sandwiched between the NiCo2O4@PEDOP hybrid and the electrolyte coated separators on both sides of the cells. The CNF film conducts both ions and electrons, and confines the charge at the respective electrodes, to result in an improved specific capacitance (SC) and energy density compared to the analogous cell without the CNF interlayers...
January 23, 2019: Nanoscale
Aobing Du, Huanrui Zhang, Zhonghua Zhang, Jingwen Zhao, Zili Cui, Yimin Zhao, Shanmu Dong, Longlong Wang, Xinhong Zhou, Guanglei Cui
A polymer-based magnesium (Mg) electrolyte is vital for boosting the development of high-safety and flexible Mg batteries by virtue of its enormous advantages, such as significantly improved safety, potentially high energy density, ease of fabrication, and structural flexibility. Herein, a novel polytetrahydrofuran-borate-based gel polymer electrolyte coupling with glass fiber is synthesized via an in situ crosslinking reaction of magnesium borohydride [Mg(BH4 )2 ] and hydroxyl-terminated polytetrahydrofuran...
January 23, 2019: Advanced Materials
Haiyang Yu, Yihang Chen, Huanhuan Wei, Jiangdong Gong, Wentao Xu
The gate insulators play a role as important as the semiconductor in high-performance OFETs with high on/off current ratio, low hysteresis, and device stability. The essential requirements for gate dielectrics include high capacitance, high dielectric breakdown strength, solution-processibility, and flexibility. In this paper, we review recent progress in developing high-k gate polymeric insulators for modern organic electronic applications in recent years. After a general introduction to OFETs, three types of high-k polymeric gate insulating materials have been enumerated in achieving high-quality OFETs, including polymer gate insulators, polymer-inorganic gate composites or bilayers, and ion gel electrolytes...
January 22, 2019: Nanotechnology
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