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Laifa Shen, Yi Wang, Haifeng Lv, Shuangqiang Chen, Peter A van Aken, Xiaojun Wu, Joachim Maier, Yan Yu
Sodium-ion batteries are emerging as promising candidates for grid energy storage because of the abundant sodium resources and low cost. However, the identification and development of suitable anode materials is far from being satisfactory. Here, it is demonstrated that the Ti2 Nb2 O9 nanosheets with tunnel structure can be used as suitable anode materials for sodium-ion batteries. Ti2 Nb2 O9 nanosheets are synthesized by liquid exfoliation combined with topotactic dehydration, delivering a high reversible capacity of 250 mAh g-1 at 50 mA g-1 at a suitable average voltage of ≈0...
October 18, 2018: Advanced Materials
Xiang Chen, Hao-Ran Li, Xin Shen, Qiang Zhang
The intrinsic instability of organic electrolytes seriously impedes the practical applications of high-capacity metal anodes, such as lithium and sodium metal anodes. The ion-solvent complexes can even further promote the decomposition of electrolytes on metal anodes. Herein, first-principles calculations were performed to investigate the origin of the reduced reductive stability of ion-solvent complexes. Both ester and ether electrolyte solvents are selected to interact with Li+, Na+, K+, Mg2+, and Ca2+. The LUMO energy levels of ion-ester complexes exhibit a linear relationship with the binding energy, regulated by the ratio of carbon atomic orbital in the LUMO...
October 18, 2018: Angewandte Chemie
Jeffrey M Klein, Evio Panichi, Burcu Gurkan
Differential capacitances of ionic liquids (ILs) butyl-trimethylammonium bis(trifluoromethyl sulfonyl)imide, [N1114][TFSI], methyl-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide, [PYR13][TFSI], and ethyl- methylimidazolium bis(trifluoromethylsulfonyl)imide, [EMIM][TFSI], were measured by electrochemical impedance spectroscopy (EIS) over the entire electrochemical window determined by cyclic voltammetry (CV). Distinct fast charging and discharging process frequencies were obtained from the complex capacitance plane extracted from EIS...
October 18, 2018: Physical Chemistry Chemical Physics: PCCP
Jing-Feng Wang, Dan-Nong He
The in situ growth of Sn/SnO heterostructured nanospheres embedded in crumpled graphene is based on a new strategy for the calcination of tin oleate coating on the crystal surface of sodium carbonate. Sn/SnO nanospheres and crumpled graphene are acquired simultaneously without external forces involved. The obtained composite exhibits superior electrochemical properties when used as an anode material for lithium-ion batteries.
October 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Katarina Stete, Tracy R Glass, Govert J van Dam, Alex Ntamatungiro, Emilio Letang, Claudia J de Dood, Paul L A M Corstjens, Robert Ndege, Herry Mapesi, Winfried V Kern, Christoph Hatz, Maja Weisser, Jürg Utzinger, Matthias C Müller
BACKGROUND: It has been hypothesized that schistosomiasis negatively influences immune reconstitution in people living with HIV starting antiretroviral therapy (ART). In this study, we investigated the effect of schistosomiasis on the course of HIV infection in patients starting ART in a rural part of Tanzania. METHODOLOGY: Retrospective study including patients prospectively enrolled in a HIV cohort in Ifakara, south-central Tanzania between January 1, 2013 and April 1, 2015...
October 17, 2018: PLoS Neglected Tropical Diseases
Yueyao Zhong, Bin Chang, Yongliang Shao, Chengwei Xu, Yongzhong Wu, Xiaopeng Hao
Phase engineering has been demonstrated as an efficient way to enhance the catalytic activity. Here, phase- and morphology-modulated Ni3Se2/NiSe nanorod arrays through hydrothermal process are reported. Partial phases conversion can effectively enhance the electrical conductivity and yield more active sites due to the atom rearrangement in the phase transformation progress. Quite low overpotential of 166 mV for hydrogen evolution reaction (HER) and and 370 mV oxygen evolution reaction (OER) are obtained in optimal sample with content of NiSe phase 32...
October 17, 2018: ChemSusChem
Christine F Markwalter, Paul L A M Corstjens, Claire M Mammoser, Garrett Camps, Govert J van Dam, David W Wright
Accurate and sensitive point-of-care diagnostic tools are critical for schistosomiasis control and elimination. The existing ultrasensitive lateral flow assay for the detection of Schistosoma circulating anodic antigen (CAA) has demonstrated excellent sensitivity but is time-consuming and requires significant laboratory infrastructure that limits its applicability at the point of care. To address this challenge, we sought to develop an alternative sample preparation method to concentrate CAA from large-volume urine samples requiring little-to-no laboratory equipment...
October 17, 2018: Analyst
Zhen Wang, Abdellah Malti, Liangqi Ouyang, Deyu Tu, Weiqian Tian, Lars Wågberg, Mahiar Max Hamedi
Paper is emerging as a promising flexible, high surface-area substrate for various new applications such as printed electronics, energy storage, and paper-based diagnostics. Many applications, however, require paper that reaches metallic conductivity levels, ideally at low cost. Here, an aqueous electroless copper-plating method is presented, which forms a conducting thin film of fused copper nanoparticles on the surface of the cellulose fibers. This paper can be used as a current collector for anodes of lithium-ion batteries...
October 16, 2018: Small
Shanshan Zhu, Jianbin Zhou, Yong Guan, Wenlong Cai, Yingyue Zhao, Yuanchao Zhu, Linqin Zhu, Yongchun Zhu, Yitai Qian
To better couple with commercial cathodes, such as LiCoO2 and LiFePO4 , graphite-based composites containing a small proportion of silicon are recognized as promising anodes for practical application in lithium-ion batteries (LIBs). However, the prepared Si/C composite still suffers from either rapid capacity fading or the high cost up to now. Here, the facile preparation of hierarchical graphene-scaffolded silicon/graphite composite is reported. In this designed 3D structure, Si nanoparticles are homogeneously dispersed on commercial graphites and then uniformly encapsulated in the hierarchical graphene scaffold...
October 16, 2018: Small
Tom J Zajdel, Moshe Baruch, Gábor Méhes, Eleni Stavrinidou, Magnus Berggren, Michel M Maharbiz, Daniel T Simon, Caroline M Ajo-Franklin
Microbial electrochemical systems provide an environmentally-friendly means of energy conversion between chemical and electrical forms, with applications in wastewater treatment, bioelectronics, and biosensing. However, a major challenge to further development, miniaturization, and deployment of bioelectronics and biosensors is the limited thickness of biofilms, necessitating large anodes to achieve sufficient signal-to-noise ratios. Here we demonstrate a method for embedding an electroactive bacterium, Shewanella oneidensis MR-1, inside a conductive three-dimensional poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) matrix electropolymerized on a carbon felt substrate, which we call a multilayer conductive bacterial-composite film (MCBF)...
October 16, 2018: Scientific Reports
Wei Zhou, Lin Fang, Lan Long, Linlin Wang, Han Chen, Yang Li, Chuankun Jia
Nb₂O5 @carbon hollow microspheres (Nb₂O5 @CHMs) have been synthesized through a facile hydrothermal method. Results revealed that numerous urchin-shaped Nb₂O5 nanospheres were tightly and uniformly anchored on the surface of carbon hollow microspheres. Nb₂O5 @CHMs with unique structure exhibited a high initial discharge capacity of 420.32 mA h·g-1 and an impressive reversible capacity of 350.15 mA h·g-1 after 100 cycles at the current density of 40 mA·g-1 . The Nb₂O5 @CHMs is a potential high-performance anode material for lithium ion batteries...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Saisai Wang, Xianli Gu, Linlin Wang, Chun Wu, Qi Liu, Lingyu Zhao, Yufan Xue, Wenyao Li, Yichuan Rui, Jingli Xu, Mei Ding
The new demands for energy storage systems have been placed with demands for flexible wearable electronics. Herein, rugby-like GeO₂ nanoparticles (NPs) have been directly grown on carbon cloth (GeO₂ NPs/CC) through a one-step hydrolysis process at room temperature, which can be used as a self-supporting flexible anode for lithium ion battery (LIBs). The rugby-like GeO₂ NPs/CC showed an improved lithium-storage performance with features of high reversible capacity ~2000 mA·h·g-1 even after 100 cycles and good cycling stability...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Xianli Gu, Saisai Wang, Linlin Wang, Chun Wu, Kaibing Xu, Lingyu Zhao, Qi Liu, Mei Ding, Jingli Xu
In this work, three-dimensional (3D) TiO₂ nanotubes (NTs) on carbon cloth (CC) (TiO₂ NTs/CC) were synthesized by a method involving formation of a ZnO@TiO₂ nanorod (NRs) on CC (ZnO@TiO₂ NRs/CC) structure and a subsequent chemical etching process for ZnO NRs template. The 3D TiO₂ NTs/CC were applied as flexible anodes for sodium ion batteries (SIBs). The TiO₂ NTs/CC yielded high specific capacity and good cycling stability, superior to that of some reported TiO₂ nanocomposites. The TiO₂ NTs/CC delivered a reversible capacity of 260 mA·h·g-1 and 85...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Minghua Chen, Shouzhi Zhang, Jiawei Zhang, Qingguo Chen
Flexible electrode material has bendable feature and can be directly applied as electrode without any additives and binders. In this study, flexible carbon nanofiber/boron nitride composites were prepared via a facile electrospinning and subsequent carbonization treatment for lithium ion battery. BN nanoparticles were uniformly dispersed in the nanofibers after an annealing temperature of 800 °C, and the diameters of nanofibers were at 100~450 nm range. The fabricated composites, used as binder-free anode materials, exhibited an impressive reversible capacity of 205 mAh·g-1 after 300 cycles at a current density of 100 mA·g-1 ...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Lan Xing, Chengli Tang, Liping Lv, Luxi Tan, Jing Li
Hierarchical rose-like structured MnCo₂O₄ spinel was synthesized via a facile solvothermal process using polyvinyl pyrrolidone (PVP) as the soft template, which was characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), etc. When evaluated as the anode materials for lithium ion batteries, the as-synthesized MnCo₂O₄ spinel exhibited excellent cycling performance and rate capacity. The initial discharge and charge capacity reached 1502 mA·h·g-1 and 1131 mA·h·g-1 at the current density of 100 mA·g-1 , respectively...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Yujie Zhao, Yan Li
Titanium dioxide (TiO₂) has provoked a significant amount of scientific and technological interest due to their anticipated impact in the fields of photocatalysis, solar cells, lithium-ion battery electrodes, and biomedical devices. This is particularly apparent in the case of anodization and ion implantation for modifying Ti-based alloys. However, the lack of sufficient solar light absorption and limited hole diffusion significantly affect the performance of TiO₂ in photocatalysis. Moreover, the biocompatibility and corrosion resistance of Ti-based biomedical device need to be enhanced to achieve a longer service life...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Chengwei Kuang, Wen Zeng, Yanqiong Li
Rechargeable magnesium ion batteries with their intrinsic advantages, such as high capacity, low reduction potential and low cost, have been a major candidate for next generation batteries beyond lithium ion batteries. Although some researches have been done in this area, it is still at its early stage hindered by sluggish kinetics and development of electrodes. This review is aimed at exhibiting the key advancement of the cathodes and anodes. Currently used cathodes, Chevel phase, V₂O5 , MnO₂ and MoS₂ are detailed introduced...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Fatima Haidar, Mathieu Maas, Andrea Piarristeguy, Annie Pradel, Sara Cavaliere, Marie-Christine Record
Platinum is the most employed electrocatalyst for the reactions taking place in energy converters, such as the oxygen reduction reaction in proton exchange membrane fuel cells, despite being a very low abundant element in the earth's crust and thus extremely expensive. The search for more active electrocatalysts with ultra-low Pt loading is thus a very active field of investigation. Here, surface-limited redox replacement (SLRR) that utilizes the monolayer-limited nature of underpotential deposition (UPD) was used to prepare ultrathin deposits of Pt, using Te as sacrificial metal...
October 15, 2018: Nanomaterials
Pavan M V Raja, Gibran L Esquenazi, Kourtney D Wright, Cathren E Gowenlock, Bruce E Brinson, Shirin Alexander, Daniel R Jones, Varun Shenoy Gangoli, Andrew R Barron
The electromigration behaviour of raw and acid purified single walled carbon nanotubes (SWCNTs) in dilute aqueous systems (0.0034 mg mL-1), in the absence of surfactant, with the addition of either 0.85 M acetic acid or 0.1 M CuSO4, was evaluated using a 2-inch copper cathode and either a 2-inch copper or 0.5-inch platinum anode. The results showed that the electromigration of raw SWCNTs (with a high catalyst residue) in the presence of CuSO4 resulted in the formation of a Cu-SWCNT composite material at the cathode...
October 16, 2018: Nanoscale
Yefeng Song, Yi-Mei Yin, Linsen Li, Zonghai Chen, Zi-Feng Ma
A durable high-performance anode with a unique microstructure of a hetero-structured surface layer and exsolved Fe-Cu bimetal nano-fibers is fabricated from a self-assembled dual-phase precursor consisting of a single perovskite (SP) and a Ruddlesden-Popper (RP) layered perovskite component. This work opens up new opportunities to fabricate high-performance anodes for IT-SOFCs.
October 16, 2018: Chemical Communications: Chem Comm
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