Effect of residual ions of hydrothermal precursors on the thickness and capacitive properties of WO3 nanoplates

Publication date: 15 May 2020Source: Journal of Alloys and Compounds, Volume 823Author(s): Jinzhi Jia, Xu Dong Liu, Xiaojia Li, Linhong Cao, Meng Zhang, Botao Wu, Xiuwen ZhouAbstractThe morphology and size of nanostructures have been considered to be directly related to capacitive performance. Additionally, hydrothermal synthesis is a common method to control nanostructures. In practice, researchers paid more attention to the direct effect of “useful ions” on morphology or size of nanostructures, e.g. the combination and decomposition processes of H+ and WO42− to form WO3. Unfortunately, the effects of other incidental residual ions on the nanostructures have been often neglected. Herein, we add an extra procedure (cleaning the precursor) in the as-optimized hydrothermal synthesis routine to remove residual ions in the solution around tungstic acid colloids. A comparative study shows such an extra procedure would result in a further considerable reduction of WO3 nanoplates in the thickness by 50% and in a prominent enhancement of the specific capacitance from 203.5 F g−1 to 334.0 F g−1 at a scan rate of 2 mV s−1. The thin WO3 nanoplates also show outstanding cycle stability for 5000 cycles. Interestingly, when we refilled the precursors solution with the Na+ and Cl− ions again, the thickness of WO3 nanoplates gradually thickens as the increase of NaCl content. In this way, the effect of residual ions...
Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research

Related Links:

A 92-year-old woman with a foreign body perforation of the esophagus underwent esophageal repair and esophageal stent placement. A computed tomography (CT) scan of the chest performed for worsening leukocytosis demonstrated an enlarging air-containing mediastinal collection despite a surgically placed mediastinal drain; interventional radiology was consulted. The 3-day-old anteriorly placed drain had a long infracardiac course, and drain exchange was believed to be too high risk for loss of access.
Source: Journal of Vascular and Interventional Radiology : JVIR - Category: Radiology Authors: Tags: Extreme IR Source Type: research
Publication date: Available online 17 February 2020Source: Materials Today: ProceedingsAuthor(s): Oleg Sobol'AbstractThe features of the formation the structural state and physic-mechanical characteristics of high-entropy alloys based on refractory metals, both in the cast state and in the state of vacuum-arc coatings, are considered. The studies were carried out using scanning electron microscopy methods with energy dispersive elemental analysis, X-ray diffractometry, and determination of the coefficient of thermal expansion, hardness and adhesive strength. It has been established that the basic state of a high-entropy al...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
Publication date: Available online 17 February 2020Source: Materials Today: ProceedingsAuthor(s): D.D. Korobov, I.V. Mitrofanov, K.A. Pushnitsa, A.E. Kim, Yu.M. Koshtyal, L.S. Pechen, A.A. Popovich, M.Yu. MaximovAbstractLi-rich oxides are one of the most promising cathode materials for the new generation of lithium-ion batteries (LIBs). This work describes the preparations of Li-rich cathode materials with composition Li1.20Ni0.13Co0.13Mn0.54O2 and the potassium – doped material Li1.15K0.05Ni0.13Co0.13Mn0.54O2. The oxides are synthesized from acetates of metals by sol-gel synthesis followed by high-temperature anneal...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
In this study, resistant starch type III (RS3) was produced from different sections, the top and bottom part of Metroxylon sagu palm at different growth stages namely, Plawei Manit, Bubul and Angau Muda. Sago starch was subjected for two cycles of autoclaving, debranching by pullulanase and cooling for the production of resistant starch. The physicochemical properties of sago RS3 studied were the starch morphology by Scanning Electron Microscopy (SEM), resistant starch content, amylose content, swelling power and solubility as influenced by different palm growth stages and sections. Significant differences in the resistant...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
Publication date: 1 May 2020Source: Materials Chemistry and Physics, Volume 246Author(s): D. Velázquez, M.A.E. Chaparro, H.N. Böhnel, R. Romero, F. LanziniAbstractSingle crystal alloys Cu-22.64 Al- 8.26 Mn and Cu-23.33 Al- 9.42 Mn (at. %) are studied by means of differential scanning calorimetry, electrical resistometry and thermomagnetic techniques. Order-disorder transitions were identified and the critical temperatures are compared with the values obtained by Monte Carlo simulations. Evidences of spinodal decomposition and magnetic transitions are discussed.
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
Publication date: Available online 17 February 2020Source: Journal of Membrane ScienceAuthor(s): Can Xu, Feng Yan, Mingxia Wang, Hao Yan, Zhenyu Cui, Jianxin Li, Benqiao HeAbstractMembrane-based treatment for oil-in-water emulsion remains a significant challenge. The main difficulties are to solve membrane fouling and to destroy the emulsion system to achieve high-efficiency emulsion separation. Herein, chemical demulsification combined with membrane separation technology was proposed for oil/water separation from the emulsion. A hyperbranched phenol-amine resin block polyether demulsifier (AE2311) was grafted onto surface...
Source: Journal of Membrane Science - Category: Materials Science Source Type: research
In this study, biocomposite films of konjac glucomannan (KGM)/carboxymethyl chitosan (CMCS) with different epigallocatechin gallate (EGCG) concentrations (0%, 5%, 10%, 15%, and 20%, w/w, based on KGM dry weight) were prepared by the solution casting method. To evaluate the effect of EGCG incorporation on the structural and physicochemical properties of the KGM/CMCS matrix, the obtained composite film-forming solutions (FFS) and films were systematically evaluated. The results from the Fourier transform infrared spectroscopy (FT-IR) analysis showed that EGCG interacted with the KGM/CMCS matrix through hydrogen bonds in the ...
Source: Food Hydrocolloids - Category: Food Science Source Type: research
WORCESTER (CBS) — Many patients who have blockages in their coronary arteries undergo special CAT scans to evaluate the problems. Now UMass Memorial Medical Center is using new 3D imaging to get a more detailed look. Joseph Callaghan, 79, has blockages in his coronary arteries. But his kidney disease complicates the picture, and it’s unclear whether he could benefit from heart surgery.  “I’m still under scrutiny by the doctors to determine what is the best course of treatment,” Callaghan said. Joseph Callaghan, 79, has blockages in his coronary arteries. (WBZ-TV) Doctors at UMass Mem...
Source: WBZ-TV - Breaking News, Weather and Sports for Boston, Worcester and New Hampshire - Category: Consumer Health News Authors: Tags: Boston News Health Syndicated CBSN Boston Syndicated Local Dr. Mallika Marshall UMass Memorial Hospital Worcester news Source Type: news
In this study, 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) was selected as a humectant of NC. First, a series of experiments were conducted to determine the feasibility of the study. Scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy were used to investigate the microstructure, nature, and functional groups of [Bmim][PF6] that affect NC. Next, the inhibition of [Bmim][PF6] on NC was confirmed through an intuitive heating test. Subsequently, the thermal stability of three types of NC systems was evaluated, and the action of [Bmim][PF6] was analysed. Thermokinetic p...
Source: Journal of Molecular Liquids - Category: Molecular Biology Source Type: research
This study demonstrates the feasibility of a fully automated technology for the accurate detection and identification of several anatomical reference points (landmarks), commonly used in intravascular imaging. This technology uses two different approaches, specially designed for the detection of aortic root and supra-aortic and visceral branches. In order to adjust the parameters of the developed algorithms, a total of 33 computed tomography scans with different types of pathologies were selected. Furthermore, a total of 30 independently selected computed tomography scans were used to assess their performance. Accuracy was...
Source: Medical and Biological Engineering and Computing - Category: Biomedical Engineering Source Type: research
More News: Chemistry | Men | Nanotechnology | PET Scan | Study