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Lu Lu, Sheng Li, Jun Li, Lifang Lan, Yan Lu, Shuaijun Xu, Si Huang, Chunyang Pan, Fenghua Zhao
The FeF3 ·0.33H2 O cathode material can exhibit a high capacity and high energy density through transfer of multiple electrons in the conversion reaction and has attracted great attention from researchers. However, the low conductivity of FeF3 ·0.33H2 O greatly restricts its application. Generally, carbon nanotubes (CNTs) and graphene can be used as conductive networks to improve the conductivities of active materials. In this work, the FeF3 ·0.33H2 O cathode material was synthesized via a liquid-phase method, and the FeF3 ·0...
March 15, 2019: Nanoscale Research Letters
Valentina Fiori, Michael A Nitsche, Gabriella Cucuzza, Carlo Caltagirone, Paola Marangolo
High-definition transcranial direct current stimulation (HD-tDCS) is a variant of tDCS, which produces more focal stimulation, delimiting brain current flow to a defined region compared to conventional tDCS. To date, only one study has been conducted to investigate HD-tDCS effects on language recovery in aphasia. Here, we aimed to assess the effects of cathodal HD-tDCS on verb naming by comparing two current intensities: 1 vs 2 mA. In a double-blinded cross over study, two groups of ten aphasic individuals were submitted to active cathodal HD-tDCS and sham stimulation over the right homolog of Broca's area, while performing a verb naming task...
March 12, 2019: Neuroscience
Janaina Andressa de Souza, João Carlos Ferrari Corrêa, Letizzia Dall' Agnol, Filipe Ribeiro Dos Santos, Márcia Rafaella Pereira Gomes, Fernanda Ishida Corrêa
BACKGROUND: Shoulder pain is reported to be one of the major challenges faced in the functional recovery of patients in rehabilitation following a stroke. In such cases, transcranial direct current stimulation (tDCS) has been used as an additional therapeutic tool for improvements in central and peripheral pain. The aim of the proposed study is to evaluate the effect of tDCS when combined with upper limb physical therapy on pain intensity and functional improvement in stroke survivors with shoulder pain in the hemiplegic limb...
March 15, 2019: Trials
Jinyun Liu, Jiawei Long, Sen Du, Bai Sun, Shuguang Zhu, Jinjin Li
Among many types of batteries, Li-ion and Li-S batteries have been of great interest because of their high energy density, low self-discharge, and non-memory effect, among other aspects. Emerging applications require batteries with higher performance factors, such as capacity and cycling life, which have motivated many research efforts on constructing high-performance anode and cathode materials. Herein, recent research about cathode materials are particularly focused on. Low electron and ion conductivities and poor electrode stability remain great challenges...
March 15, 2019: Nanomaterials
Vandung Do, Deepika, Mun Sek Kim, Min Seop Kim, Kwang Ryeol Lee, Won Il Cho
Lithium-sulfur (Li-S) batteries are attracting substantial attention because of their high-energy densities and potential applications in portable electronics. However, an intrinsic property of Li-S systems, that is, the solubility of lithium polysulfides (LiPSs), hinders the commercialization of Li-S batteries. Herein, a new material, that is, carbon nitride phosphorus (CNP), is designed and synthesized as a superior LiPS adsorbent to overcome the issues of Li-S batteries. Both the experimental results and the density functional theory (DFT) calculations confirm that CNP possesses the highest binding energy with LiPS at a P concentration of ∼22% (CNP22)...
March 15, 2019: ACS Applied Materials & Interfaces
Xiaona Li, Jianwen Liang, Jing Luo, Changhong Wang, Xia Li, Qian Sun, Ruying Li, Li Zhang, Rong Yang, Shigang Lu, Huan Huang, Xueliang Sun
All-solid-state Li-S batteries are promising candidates for next-generation energy-storage systems considering their high energy density and high safety. However, their development is hindered by the sluggish electrochemical kinetics and low S utilization due to high interfacial resistance and the electronic insulating nature of S. Herein, Se is introduced into S cathodes by forming SeSx solid solutions to modify the electronic and ionic conductivities and ultimately enhance cathode utilization in all-solid-state lithium batteries (ASSLBs)...
March 15, 2019: Advanced Materials
Yongguang Zhang, Jun Ren, Yan Zhao, Taizhe Tan, Fuxing Yin, Yichao Wang
In this work, a unique three-dimensional (3D) structured carbon-based composite was synthesized. In the composite, multiwalled carbon nanotubes (MWCNT) form a lattice matrix in which porous spherical reduced graphene oxide (RGO) completes the 3D structure. When used in Li-S batteries, the 3D porous lattice matrix not only accommodates a high content of sulfur, but also induces a confinement effect towards polysulfide, and thereby reduces the "shuttle effect". The as-prepared S-3D-RGO@MWCNT composite delivers an initial specific capacity of 1102 mAh·g-1 ...
2019: Beilstein Journal of Nanotechnology
Konrad Trzciński, Mariusz Szkoda, Andrzej P Nowak, Marcin Łapiński, Anna Lisowska-Oleksiak
Composites based on the titania nanotubes were tested in aqueous electrolyte as a potential electrode material for energy storage devices. The nanotubular morphology of TiO2 was obtained by Ti anodization. TiO2 nanotubes were covered by a thin layer of bismuth vanadate using pulsed laser deposition. The formation of the TiO2 /BiVO4 junction leads to enhancement of pseudocapacitance in the cathodic potential range. The third component, the conjugated polymer PEDOT:PSS, was electrodeposited from an electrolyte containing the monomer EDOT and NaPSS as a source of counter ions...
2019: Beilstein Journal of Nanotechnology
Shiyu Zhang, Cheng Peng, Chengzhi Guan, Guoping Xiao, Jianqiang Wang
Fabricating lanthanum strontium manganite (LSM) ceramics with certain shapes is important for the design and construction of high-temperature energy conversion and storage devices. Here, we describe a low-cost and environmentally friendly method for fabricating LSM ceramics via agar gel casting and high temperature sintering. This new approach uses temperature tuning to fabricate LSM gel bodies, not only by manufacturing in the secondary process but also by remolding and recycling during the gel casting process...
March 13, 2019: Materials
Zhiyong Yu, Jishen Hao, Wenji Li, Hanxing Liu
Co-doped Li₂MoO₃ was successfully synthesized via a solid phase method. The impacts of Co-doping on Li₂MoO₃ have been analyzed by X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) measurements. The results show that an appropriate amount of Co ions can be introduced into the Li₂MoO₃ lattices, and they can reduce the particle sizes of the cathode materials. Electrochemical tests reveal that Co-doping can significantly improve the electrochemical performances of the Li₂MoO₃ materials...
March 13, 2019: Materials
Yanqing Fu, Qiliang Wei, Gaixia Zhang, Yu Zhong, Nima Moghimian, Xin Tong, Shuhui Sun
In this work, we investigated three types of graphene (i.e., home-made G, G V4, and G V20) with different size and morphology, as additives to a lithium iron phosphate (LFP) cathode for the lithium-ion battery. Both the LFP and the two types of graphene (G V4 and G V20) were sourced from industrial, large-volume manufacturers, enabling cathode production at low cost. The use of wrinkled and/or large pieces of a graphene matrix shows promising electrochemical performance when used as an additive to the LFP, which indicates that the features of large and curved graphene pieces enable construction of a more effective conducting network to realize the full potential of the active materials...
March 13, 2019: Materials
Abhishek Sarkar, Pranav Shrotriya, Abhijit Chandra
Experimental and numerical studies have shown that mechanical loading associated with lithiation/delithiation may limit the useful life of battery electrode materials. The paper presents an approach to parameterize and compare electrode material performance based on mechanical stability. A mathematical model was developed to determine particle deformation and stress fields based upon an elastic-perfectly plastic constitutive response. Mechanical deformation was computed by combining the stress equilibrium equations with the electrochemical diffusion of lithium ions into the electrode particle...
March 12, 2019: Materials
Yang Shi, Darren Tan, Mingqian Li, Zheng Chen
Next-generation lithium-ion batteries (LIBs) will have 2~3 times increase in energy density compared to today's technology due to the adoption of new cathode and anode materials. In addition, their safety properties need to be further enhanced to allow large scale applications. In this context, new electrolytes with high lithium-ion (Li+) conductivity as well as good stability should be developed. Recently, there has been a growing interest in developing nanohybrid electrolytes. By combining organic (polymers, ionic liquids) and/or inorganic (Li+-conductive ceramics and glasses) functional constituents, a broad range of nanohybrid electrolytes with interesting chemical, mechanical and electrochemical properties have been designed and evaluated in different cell chemistries...
March 14, 2019: Nanotechnology
Simon Müller, Thilo Behrends, Case M van Genuchten
Iron-electrocoagulation is a promising contaminant (e.g. arsenic) removal technology that is based on electrochemical Fe(II) production from steel electrodes and subsequent transport of Fe(II) to the bulk solution, where contaminant removal occurs. Although Fe-electrocoagulation systems have been shown to effectively remove contaminants in extended field trials, the efficiency of field systems can be lower than in laboratory studies. One hypothesis for this disparity is that the Faradaic efficiency of short-term laboratory experiments is higher than field systems operated over extended periods...
November 25, 2018: Water Research
Bokai Cao, Jiangtao Huang, Yan Mo, Chunyang Xu, Yong Chen, Hai-Tao Fang
In order to alleviate the inferior cycle stability of sulfur cathode, a self-assembled SnO2-doped manganese silicate nanobubbles (SMN) is designed as sulfur/polysulfides host to immobilize the intermediate Li2Sx, and nitrogen-doped carbon (N-C) is coated on SMN (SMN@C). The exquisite N-C conductive network could not only provides sufficient free space for the volume expansion during the phase transition of solid sulfur into lithium sulfide, but also reduces Rct of SMN. During cycling, the soluble polysulfide could be fastened by the silicate with oxygen-rich functional group and hetero nitrogen atoms through chemical bonding, enabling a confined shuttle effect...
March 14, 2019: ACS Applied Materials & Interfaces
Xiang Xiao, Mingyong Wang, Jiguo Tu, Shuqiang Jiao
Developing a suitable cathode material for rechargeable aluminum-ion batteries (AIBs) is currently recognized as a key challenge in pushing AIBs from lab-level to industrial application. Herein, detailed density functional theory (DFT) calculations are carried out to investigate the potential application of black and blue phosphorus monolayers as cathode materials for AIBs. It can be found that AlCl4- ions can strongly bind with both phosphorene allotropes, along with significant charge transfer. For black P, a semiconducting-to-metallic transition is realized in the (AlCl4)8P16 compound...
March 14, 2019: Physical Chemistry Chemical Physics: PCCP
Yu Wang, Li Liu, Yanwei Wang, Ling Fang, Fu Wan, Huijuan Zhang
Herein, we fabricated two groups of component-tunable sandwich-like CoTe2xSe2(1-x) and CoS2ySe2(1-y) graphitized carbon-based composites. Due to the synergistic effect between the sandwich-like structures and anion-doping, CoTe2xSe2(1-x) and CoS2ySe2(1-y) demonstrated attractive catalytic performance towards the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. After optimizing the composition, we found that sandwich-like Co(Te0.33Se0.67)2 possesses optimal OER properties, with a low Tafel slope (44 mV dec-1), a small η10 (272 mV) and eminent stability for 50 h; meanwhile, the Co(S0...
March 14, 2019: Nanoscale
Xifan Fu, Xiangjun Pu, Huiming Wang, Dong Zhao, Guangrong Liu, Dong Zhao, Zhongxue Chen
The effects of discharge cutoff voltages on the structural evolution and electrochemical performance of the LiVO3 cathode upon cycling are investigated by electrochemical measurements, electrochemical impedance spectroscopy, ex situ X-ray diffraction, Raman spectra, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. It is found that a lower cutoff voltage causes formation and accumulation of unstable V4+ ions on the surface of the electrode, which easily leads to severe structural deterioration and capacity fading...
March 14, 2019: Physical Chemistry Chemical Physics: PCCP
Xiaohong Liu, Guilin Feng, Enhui Wang, Hui Chen, Zhen-Guo Wu, Wei Xiang, Yan-Jun Zhong, Yanxiao Chen, Xiao-Dong Guo, Benhe Zhong
The peak-loading shift function of sodium ion batteries in large-grid energy storage station confront great challenge owing to the poor rate performance of cathodes. NASICON type Na3V2(PO4)3 with stable three-dimensional structure and fast ion diffusion channels has been regarded as one of the potential candidates and was widely studied. Nevertheless, a multilevel integrated strategy to boost the performance of Na3V2(PO4)3 from crystal structure modulation, coated carbon graphitization regulation and particle morphology design is rarely reported and deserves much attention...
March 14, 2019: ACS Applied Materials & Interfaces
Jijun Zhang, Zexiang Chen, Yan Wang, Xinyu Yan, Zhiyu Zhou, Huifang Lv
High electrochemical performance of asymmetric supercapacitor (ASC) depends on exquisite nanostructure design and synthesis of electrodes, including structural controllable design and synthesis of high theoretical performance materials and nanocomposite materials. Herein, a template-free hierarchical core-shell nanostructure of CoNiO2 @NiAl-layered double hydroxide (NiAl-LDH) and α-Fe2 O3 with a hollow spherical structure composed of nanoparticles are successfully prepared. The CoNiO2 @NiAl-LDH as the cathode electrode and the hollow spherical α-Fe2 O3 as the anode electrode of the ASC devices exhibit superior electrochemical performance...
March 11, 2019: Nanoscale Research Letters
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