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Paper or flexible supercapacitor*

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
Sungwoo Chun, Wonkyeong Son, Gwangyeob Lee, Shi Hyeong Kim, Jong Woo Park, Seon Jeong Kim, Changhyun Pang, Changsoon Choi
Applications in the field of portable and wearable electronics are becoming multifunctional, and the achievement of transparent electronics extensively expands the applications into devices such as wearable flexible displays or skin-attachable mobile computers. Moreover, the self-charging power system (SCPS) is the core technique for realizing portable and wearable electronics. Here, we propose a transparent and flexible multifunctional electronic system in which both an all-in-one SCPS and a touch sensor are combined...
February 13, 2019: ACS Applied Materials & Interfaces
Donghui Zheng, Man Li, Yongyan Li, Chunling Qin, Yichao Wang, Zhifeng Wang
Developing a facile and environmentally friendly approach to the synthesis of nanostructured Ni(OH)2 electrodes for high-performance supercapacitor applications is a great challenge. In this work, we report an extremely simple route to prepare a Ni(OH)2 nanopetals network by immersing Ni nanofoam in water. A binder-free composite electrode, consisting of Ni(OH)2 nanopetals network, Ni nanofoam interlayer and Ni-based metallic glass matrix (Ni(OH)2 /Ni-NF/MG) with sandwich structure and good flexibility, was designed and finally achieved...
2019: Beilstein Journal of 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
Yixuan Wang, Weijie Zhang, Xinli Guo, Kai Jin, Zhongtao Chen, Yuanyuan Liu, Liangliang Yin, Long Li, Kuibo Yin, Litao Sun, Yuhong Zhao
Transition-metal selenide electrodes have recently attracted increasing interests in supercapacitors result from their superior electrochemical performance, lower-cost and environmental friendliness. Herein, we report a novel bimetallic Ni-Co selenide nanosheets/3D graphene/nickel foam binder-free electrode (NiCo2.1Se3.3 NSs/3D G/NF) prepared via chemical vapor deposition (CVD) followed by a simple two-step hydrothermal process in this paper. The NiCo2.1Se3.3 NSs array vertically on 3D G/NF with a uniform and stable structure without using any chemical binders...
February 5, 2019: ACS Applied Materials & Interfaces
Sathish Chander Dhanabalan, Balaji Dhanabalan, Xing Chen, Joice Sophia Ponraj, Han Zhang
The journey of smart textile-based wearable technologies first started with the attachment of sensors to fabrics, followed by embedding sensors in apparels. Presently, garments themselves can be transformed into sensors, which demonstrates the tremendous growth in the field of smart textiles. Wearable applications demand flexible materials that can withstand deformation for their practical use on par with conventional textiles. To address this, we explore the potential reasons for the enhanced performance of wearable devices realized from the fabrication of carbon nanostructured fibers with the use of graphene, carbon nanotubes and other two-dimensional materials...
February 5, 2019: Nanoscale
Debananda Mohapatra, Ganesh Dhakal, Mostafa Saad Sayed, Badrayyana Subramanya, Jae-Jin Shim, Smrutiranjan Parida
Recently, enhancement of the energy density of supercapacitor is restricted by the inferior capacitance of the negative electrodes, which impedes the commercial development of high- performance symmetric and asymmetric supercapacitors. This paper introduces the in-situ bulk-quantity synthesis of hydrophilic, porous, graphitic sulfur-doped carbon nano-onions (S-CNO) using a facile flame-pyrolysis technique and evaluated its potential applications as high-performance supercapacitor electrode in a symmetric device configuration...
February 4, 2019: ACS Applied Materials & Interfaces
Clara Pereira, Rui S Costa, Laury Lopes, Belén Bachiller-Baeza, Inmaculada Rodríguez-Ramos, Antonio Guerrero-Ruiz, Pedro B Tavares, Cristina Freire, André M Pereira
Correction for 'Multifunctional mixed valence N-doped CNT@MFe2O4 hybrid nanomaterials: from engineered one-pot coprecipitation to application in energy storage paper supercapacitors' by Clara Pereira et al., Nanoscale, 2018, 10, 12820-12840.
February 1, 2019: Nanoscale
Yuzhu Li, Huanwen Wang, Libin Wang, Zhifei Mao, Rui Wang, Beibei He, Yansheng Gong, Xianluo Hu
Hybrid Na-ion capacitors (NICs) are receiving considerable interest because they combine the merits of both batteries and supercapacitors and because of the low-cost of sodium resources. However, further large-scale deployment of NICs is impeded by the sluggish diffusion of Na+ in the anode. To achieve rapid redox kinetics, herein the controlled fabrication of mesoporous orthorhombic-Nb2 O5 (T-Nb2 O5 )/carbon nanofiber (CNF) networks is demonstrated via in situ SiO2 -etching. The as-obtained mesoporous T-Nb2 O5 (m-Nb2 O5 )/CNF membranes are mechanically flexible without using any additives, binders, or current collectors...
January 30, 2019: Small
Hongwei Sheng, Xuetao Zhang, Yonglu Ma, Pengxiang Wang, Jinyuan Zhou, Qing Su, Wei Lan, Erqing Xie, Chuanfang John Zhang
Developing high-performance, flexible, transparent supercapacitors for wearable electronics represents an important challenge as it requires active materials to be sufficiently transparent without compromising energy storage. Here we manipulate the morphology of the active materials and the junctions on the current collector to achieve optimum electronic/ionic transport kinetics. Two-dimensional Co(OH)2 nanosheets with single- or bi-layered were vertically aligned onto a modified AgNWs network using an electrochemical deposition-UV irradiation approach...
January 29, 2019: ACS Applied Materials & Interfaces
Zhiyi Wu, Hengyu Guo, Wenbo Ding, Yi-Cheng Wang, Lei Zhang, Zhong Lin Wang
Blue energy harvested from ocean wave is an important and promising renewable energy source for sustainable development of our society. Triboelectric nanogenerators (TENGs) and electromagnetic energy harvesters (EMGs) both are considered as promising approaches for harvesting blue energy. In this work, a hybridized triboelectric-electromagnetic water wave energy harvester (WWEH) based on a magnetic sphere is presented. A freely-rolling magnetic sphere senses the water motion to drive the friction object sliding on a solid surface for TENG back and forth...
January 25, 2019: ACS Nano
Dedong Jia, Degang Jiang, Yiwei Zheng, Hua Tan, Xueying Cao, Fang Liu, Lijun Yue, Yuanyuan Sun, Jingquan Liu
The introduction of oxygenous functional groups onto graphene can provide additional pseudocapacitance for supercapacitors. However, how to balance the amount of introduced oxygenous functional groups and the reduced electrical conductivity arising from the disruption of the conjugated system remains a big challenge. Here, a controllable strategy is reported to prepare moderately oxidized reduced graphene oxide (MORGO) via an electrochemical oxidation process. The MORGO not only has oxygenous groups with appropriate quantities, but also preserves the highly crystalline structure of the π-π conjugated carbon framework...
January 24, 2019: Nanoscale
Vanchiappan Aravindan, Subramanian Natarajan, Yun-Sung Lee
Biomass-derived carbons gained special attention as efficient, low cost and fascinating active material for charge storage devices regardless of various power systems like supercapacitors and rechargeable batteries. In this paper, we discussed the influence of biomass-derived carbonaceous material as a positive or negative electrode or both employed in high energy hybrid Li-ion configuration with an organic electrolyte. In such a hybrid configuration, the electrochemical activity is entirely different compared to conventional electrical double layer capacitors...
January 23, 2019: Chemistry, An Asian Journal
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
Xiao-Man Cao, Zheng-Bo Han
Rational design and synthesis of hollow core-shell hetero-structures with high complexity still remains challenging for high-performance supercapacitors. Here, a simple and effective strategy that involves a 'root-etch-wrap' process was developed to synthesize hollow core-shell hetero-structured electrodes. Specifically, ZnO hollow spheres take root on carbon cloth via an in situ growth routine, then are etched to aid the generation of a ZIF-8 shell. As-synthesized hollow core-shell ZnO@ZIF-8 is wrapped by PANI nanocoating, resulting in a flexible conductive porous electrode (denoted as PANI/ZnO@ZIF-8-CC)...
January 21, 2019: Chemical Communications: Chem Comm
Qi Zhang, Chaoji Chen, Wenshuai Chen, Glenn Pastel, Xiaoyu Guo, Shou-Xin Liu, Qingwen Wang, Yixing Liu, Jian Li, Haipeng Yu, Liangbing Hu
Nanocellulose has emerged as a promising sustainable nanomaterial for constructing advanced electrochemical energy storage systems with renewability, lightweight, flexibility, high performance, and good safety. Here, we demonstrate a high-performance all-nanofiber asymmetric supercapacitor (ASC) using a forest-based, nanocellulose-derived hierarchical porous carbon (nanocellulose-carbon, HPC) anode, a mesoporous nanocellulose membrane separator (nanocellulose-separator) and a NiCo2O4 cathode with nanocellulose carbon as support matrix (nanocellulose-cathode, HPC/NiCo2O4)...
January 18, 2019: ACS Applied Materials & Interfaces
Xianqiang Sun, Jianxin He, Rong Qiang, Nan Nan, Xiaolu You, Yuman Zhou, Weili Shao, Fan Liu, Rangtong Liu
One-dimensional, flexible yarn-shaped supercapacitors for woven cloth have the potential for use in different kinds of wearable devices. Nevertheless, the challenge that supercapacitors face is low energy density. In this paper, we present a low-cost and large-scale manufacturing method to construct a supercapacitor yarn with high power and high energy density. To construct the novel and flexible poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate)⁻polyacrylonitrile (PDEOT: PSS-PAN)/Ni cotton (PNF/NiC) capacitor yarn, an electrospinning technique was initially used to wrap the polyacrylonitrile (PAN) nanofibers around the core Ni-coated yarn...
January 16, 2019: Materials
Zhongxiao Li, Jinke Wang, Ruofei Hu, Chi Lv, Junping Zheng
A new kind of polysiloxane-supported ionogel is successfully designed via locking ionic liquids (ILs), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][Tf2 N]), into poly(aminopropyl-methylsiloxane) (PAPMS) grafted with [2-(methacryloyloxy)ethyl] trimethylammonium chloride (METAC) in the presence of tannic acid (TA). The novel ionogel exhibits good mechanical and recovery properties, as well as high ionic conductivity (1.19 mS cm-1 ) at 25 °C. In addition, the totally physical dual-crosslinked network based on ionic aggregates among METAC and the hydrogen bonds between PAPMS and TA provides excellent self-healing ability, which allows the damaged ionogel to almost completely heal (≈83%) in 12 h at room temperature...
January 17, 2019: Macromolecular Rapid Communications
Hun Park, Rohan B Ambade, Sung Hyun Noh, Wonsik Eom, Ki Hwan Koh, Swapnil B Ambade, Won Jun Lee, Seong Hun Kim, Tae Hee Han
Fiber nanomaterials can become fundamental devices that can be woven into smart textiles, for example, miniaturized fiber-based supercapacitors (FSCs). They can be utilized for portable, wearable electronics and energy storage devices, which are highly prospective areas of research in the future. Herein, we developed porous carbon nanotube-graphene hybrid fibers (CNT-GFs) for all-solid-state symmetric FSCs, which were assembled through wet-spinning followed by a hydrothermal activation process using environmentally benign chemicals (i...
January 17, 2019: ACS Applied Materials & Interfaces
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