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Flexible electrolyte

Jiangfeng Gong, Jing-Chang Li, Jing Yang, Shulin Zhao, Ziyuan Yang, Kaixiao Zhang, Jianchun Bao, Huan Pang, Min Han
Orientation and hybridization of ultrathin two-dimensional (2D) nanostructures on interdigital electrodes is vital for developing high-performance flexible in-plane micro-supercapacitors (MSCs). Despite great progress has been achieved, integrating CuSe and Ni(OH)2 nanosheets to generate advanced nanohybrids with oriented arrangement of each component and formation of porous frameworks remains a challenge, and their application for in-plane MSCs has not been explored. Herein, the vertically-aligned CuSe@Ni(OH)2 hybrid nanosheet films with hierarchical open channels are skillfully deposited on Au interdigital electrodes/polyethylene terephthalate substrate via a template-free sequential electrodeposition approach, and directly employed to construct in-plane MSCs by choosing polyvinyl alcohol-LiCl gel as both the separator and solid electrolyte...
October 18, 2018: ACS Applied Materials & Interfaces
Yonggang Wang, Xiaofeng Lei, Xizheng Liu, Wenqing Ma, Zhen Cao, Yi Ding
Flexible Li-air batteries (LABs) have been considered as promising power sources for wearable electronics due to its higher energy density. However, when operated in ambient air, it suffers tremendous issues including Li anode passivation, poor cycle life as well as leakage of liquid electrolyte. Herein, we present a LAB with a tetraethylene glycol dimethyl ether (TEGDME, G4) gel electrolyte, in which the gel is in-situ formed through a cross-linking reaction between the liquid G4 and the Lithium Ethylenediamine (LiEDA) grown on the surface of Li anode...
October 15, 2018: Angewandte Chemie
Jian Wu, Shi-Yang Tang, Tao Fang, Weihua Li, Xiangpeng Li, Shiwu Zhang
The controlled actuation of gallium liquid-metal (LM) alloys has presented new and exciting opportunities for constructing mobile robots with structural flexibility. However, the locomotion of current LM-based actuators often relies on inducing a gradient of interfacial tension on the LM surface within electrolytes, which limits their application outside a liquid environment. In this work, a wheeled robot using a LM droplet as the core of the driving system is developed that enables it to move outside liquid environment...
October 15, 2018: Advanced Materials
Heng Zhang, Youdi Liu, Chao Yang, Li Xiang, Youfan Hu, Lian-Mao Peng
Electronic systems on ultrathin polymer films are generally processed with rigid supporting substrates during fabrication, followed by delamination and transfer to the targeted working areas. The challenge associated with an efficient and innocuous delamination operation is one of the major hurdles toward high-performance ultrathin flexible electronics at large scale. Herein, a facile, rapid, damage-free approach is reported for detachment of wafer-scale ultrathin electronic foils from Si wafers by capillary-assisted electrochemical delamination (CAED)...
October 11, 2018: Advanced Materials
Chip J Smith, Sascha Gehrke, Oldamur Hollóczki, Durgesh V Wagle, Mark P Heitz, Gary A Baker
Bacterial cellulose ionogels (BCIGs) represent a new class of material comprising a significant content of entrapped ionic liquid (IL) within a porous network formed from crystalline cellulose microfibrils. BCIGs suggest unique opportunities in separations, optically active materials, solid electrolytes, and drug delivery due to the fact that they can contain as much as 99% of an IL phase by weight, coupled with an inherent flexibility, high optical transparency, and the ability to control ionogel cross-sectional shape and size...
May 21, 2018: Journal of Chemical Physics
Tahmid Latif, Michael McKnight, Michael D Dickey, Alper Bozkurt
Biobotics investigates the use of live insects as biological robots whose locomotion can be controlled by neurostimulation through implanted electrodes. Inactivity in the biobots (biological robots) can sometimes be noticed following extended neurostimulation, partly owing to incompatibility of implanted electrodes with the biobotic application or gradual degradation of the tissue-electrode interface. Implanted electrodes need to sufficiently exhibit consistent, reliable, and stable performance during stimulation experiments, have low tissue-electrode impedance, facilitate good charge injection capacity, and be compact in size or shape...
2018: PloS One
Chaoji Chen, Liangbing Hu
Cellulose is the most abundant biopolymer on Earth and has long been used as a sustainable building block of conventional paper. Note that nanocellulose accounts for nearly 40% of wood's weight and can be extracted using well-developed methods. Due to its appealing mechanical and electrochemical properties, including high specific modulus (∼100 GPa/(g/cm3 )), excellent stability in most solvents, and stability over a wide electrochemical window, nanocellulose has been widely used as a separator, electrolyte, binder, and substrate material for energy storage...
October 9, 2018: Accounts of Chemical Research
Pengcheng Dai, Yanming Xue, Shuo Zhang, Lei Cao, Daiming Tang, Xin Gu, Liangjun Li, Xuebin Wang, Xiangfen Jiang, Dandan Liu, Lingzhao Kong, Yoshio Bando, Dmitri V Golberg, Xuebo Zhao
Heteroatom-doped three dimensional (3D) carbon fiber networks have attracted immense interest because of their extensive applications in energy storage devices. However, their practical production and usage remain a great challenge due to the costly and complex synthetic procedures. In this work, flexible B, N, and O heteroatom-doped 3D interconnected carbon microfiber networks (BNOCs) with controllable pore sizes and elemental contents were successfully synthesized via a facile one-step "chemical vapor etching & doping" (CVE&D) method by using cellulose-made paper, the most abundant and cost-effective biomass, as original network-frame precursor...
October 8, 2018: ACS Applied Materials & Interfaces
Jingying Duan, Guohui Qin, Luofu Min, Yuchen Yang, Chengyang Wang
The photochemistry and sodium storage process have been generally considered as two separated approaches without strong connection. Here, we dedicate to improve the electrochemical performance of MoS2 based composite via ultraviolet (UV) irradiation. C@MoS2@CN nanospheres consist of double protective structures, including inner hollow carbon spheres with thin wall (C) and outer N-doping carbon nanosheets (CN) derived from polydopamine. The special nanostructure possesses the virtues such as wide-interlayer spacing, flexible feature with great structure integrity and rich active sites, which endow the fast electron transfer and shorten the ion diffusion pathways...
October 5, 2018: ACS Applied Materials & Interfaces
Yunhui Shi, Yan Zhang, Limin Jia, Qian Zhang, Xinhua Xu
Next-generation wearable electronics are expected to endure significant deformations and mechanical damage. Therefore, self-healing stretchable electrolytes with high ionic conductivity and robust mechanical strength, that are high tolerance of deformations and to spontaneously recover electrochemical properties after external damage, are necessary conditions for the realization of flexible supercapacitors. Here, a new type of zwitterionic supramolecular hydrogels crosslinked through rationally designed ionic associations and hydrogen bonds is reported (PAD/H2SO4)...
September 28, 2018: ACS Applied Materials & Interfaces
Yukun Ren, Chunlei Song, Weiyu Liu, Tianyi Jiang, Jingni Song, Qisheng Wu, Hongyuan Jiang
Induced-charge electroosmosis (ICEO) has attracted tremendous popularity for driving fluid motion from the microfluidic community since the last decade, while less attention has been paid to ICEO-based nanoparticle manipulation. We propose herein a unique concept of hybrid electroosmotic kinetics (HEK) in terms of bi-phase ICEO (BICEO) actuated in a four-terminal spiral electrode array, for effective electrokinetic enrichment of fluorescent polystyrene nanoparticles on ideally polarizable metal strips. First, by alternating the applied AC voltage waves between consecutive discrete terminals, the flow stagnation lines where the sample nanoparticles aggregate can be switched in time between two different distribution modes...
September 26, 2018: Electrophoresis
Yi-Jing Li, Chao-Ying Fan, Jing-Ping Zhang, Xing-Long Wu
Solid-state lithium metal batteries have emerged as a promising alternative to existing liquid Li-ion batteries and can power the future storage market considering their higher energy outputs and better safety. Among various solid electrolytes, polymer electrolytes have received more attention due to their potential advantages, including wide electrochemical windows, ease of processing, low interface impedance and low cost. Polymeric electrolytes based on poly(ethylene oxide) (PEO) as a well-known polymer matrix have been extensively studied because of their highly flexible EO segments in the amorphous phase that can provide channels for lithium ion transport...
September 25, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
M Mirzaee, G Behzadi Pour
In this study, the ultracapacitor has been fabricated based on the BaTiO3/PEDOT: PSS separator film and polyvinyl alcohol (PVA) electrolyte. On the paper-substrate was coated a film of the graphite nanoparticles (GNPs) as an electrode. The GNPs and surface morphology of the separator, electrolyte and electrode have been characterized using transmission electron microscopy (TEM) and scanning electron microscopy (SEM) respectively. The specific capacitance of the ultracapacitor was measured using cyclic voltammetry and galvanostatic techniques...
September 24, 2018: Recent Patents on Nanotechnology
Qiang Yi, Wenqiang Zhang, Shaoqing Li, Xinyuan Li, Chunwen Sun
High-performance electrolytes and electrode materials play a critical role in advanced sodium-ion batteries with higher energy densities. In this work, we prepared a poly(methyl methacrylate)-filled composite electrolyte (named as GHSE) by in situ polymerization of methyl methacrylate in the porous Na3 Zr2 Si2 PO12 -polymer vinylidene fluoride-hexafluoropropylene composite membrane for the first time. The GHSE membrane exhibits a high ionic conductivity (2.78 × 10-3 S cm-1 ), wide electrochemical window (∼4...
October 4, 2018: ACS Applied Materials & Interfaces
Minjeong Park, Joohee Kim, Hanjung Song, Seonpil Kim, Minhyon Jeon
Ionic electroactive polymer (IEAP) actuators that are driven by electrical stimuli have been widely investigated for use in practical applications. However, conventional electrodes in IEAP actuators have a serious drawback of poor durability under long-term actuation in open air, mainly because of leakage of the inner electrolyte and hydrated cations through surface cracks on the metallic electrodes. To overcome this problem, a top priority is developing new high-performance ionic polymer actuators with graphene electrodes that have superior mechanical, electrical conductivity, and electromechanical properties...
September 16, 2018: Sensors
Tian Liang, Huanwen Wang, Dongming Xu, Ke Liao, Rui Wang, Beibei He, Yansheng Gong, Chunjie Yan
Flexible energy storage devices have become critical components for next-generation portable electronics. In the present work, a flexible quasi-solid-state lithium-ion capacitor (LIC) is developed based on graphene-based bendable freestanding films in a gel polymer electrolyte. A graphene encapsulated Fe3O4 nanocube hybrid film (rGO@Fe3O4) has been fabricated as the anode of LICs through a filtration assisted self-assembly and the subsequent thermal annealing process. In this hybrid architecture, flexible and ultrathin graphene shells uniformly enwrap the Fe3O4 within the whole film, which can effectively suppress the aggregation of Fe3O4 and also accommodate the volume change of Fe3O4 during the cycling process...
September 27, 2018: Nanoscale
Yi Qiang, Pietro Artoni, Kyung Jin Seo, Stanislav Culaclii, Victoria Hogan, Xuanyi Zhao, Yiding Zhong, Xun Han, Po-Min Wang, Yi-Kai Lo, Yueming Li, Henil A Patel, Yifu Huang, Abhijeet Sambangi, Jung Soo V Chu, Wentai Liu, Michela Fagiolini, Hui Fang
Transparent microelectrode arrays have emerged as increasingly important tools for neuroscience by allowing simultaneous coupling of big and time-resolved electrophysiology data with optically measured, spatially and type resolved single neuron activity. Scaling down transparent electrodes to the length scale of a single neuron is challenging since conventional transparent conductors are limited by their capacitive electrode/electrolyte interface. In this study, we establish transparent microelectrode arrays with high performance, great biocompatibility, and comprehensive in vivo validations from a recently developed, bilayer-nanomesh material composite, where a metal layer and a low-impedance faradaic interfacial layer are stacked reliably together in a same transparent nanomesh pattern...
September 2018: Science Advances
Kyunggu Kim, Hochun Lee
Thermoelectrochemical cells (TECs) provide conspicuous advantages, including a high Seebeck coefficient (Se), design flexibility, and low cost compared with conventional thermoelectric devices. Here, we investigated TECs employing Li metal electrodes (Li-TECs) and a series of glyme (CH3O[CH2CH2O]nCH3, n = 1-4, nG) solvents with 0.5-3.0 M lithium-imide salts (lithium bis [fluorosulfonyl]imide, LiFSI, and lithium bis[trifluoromethane sulfonyl]imide, LiTFSI). The Se value and power performance of Li-TECs markedly depend on the nature of glyme solvents and Li salt concentration...
September 19, 2018: Physical Chemistry Chemical Physics: PCCP
Xiao-Tian Gao, Ying Xie, Xiao-Dong Zhu, Ke-Ning Sun, Xu-Ming Xie, Yi-Tao Liu, Jian-Yong Yu, Bin Ding
Being conductive and flexible, 2D transition metal nitrides and carbides (MXenes) can serve in Li-S batteries as sulfur hosts to increase the conductivity and alleviate the volume expansion. However, the surface functional groups, such as OH and F, weaken the ability of bare MXenes in the chemisorption of polysulfides. Besides, they create numerous hydrogen bonds which make MXenes liable to restack, resulting in substantial loss of active area and, thus, inaccessibility of ions and electrolyte. Herein, a facile, one-step strategy is developed for the growth of TiO2 quantum dots (QDs) on ultrathin MXene (Ti3 C2 Tx ) nanosheets by cetyltrimethylammonium bromide-assisted solvothermal synthesis...
September 2, 2018: Small
Pengcheng Yao, Bin Zhu, Haowei Zhai, Xiangbiao Liao, Yuxiang Zhu, Weiheng Xu, Qian Cheng, Charles Jayyosi, Zheng Li, Jia Zhu, Kristin M Myers, Xi Chen, Yuan Yang
Solid electrolytes are crucial for the development of solid state batteries. Among different types of solid electrolytes, poly(ethylene oxide) (PEO)-based polymer electrolytes have attracted extensive attention owing to their excellent flexibility and easiness for processing. However, their relatively low ionic conductivities and electrochemical instability above 4 V limit their applications in batteries with high energy density. Herein, we prepared poly(vinylidene fluoride) (PVDF) polymer electrolytes with an organic plasticizer, which possesses compatibility with 4 V cathode and high ionic conductivity (1...
September 7, 2018: Nano Letters
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