12 research outputs found
Electrochemical Properties of the LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> Cathode Material Modified by Lithium Tungstate under High Voltage
An
amount (5 wt %) of lithium tungstate (Li<sub>2</sub>WO<sub>4</sub>) as an additive significantly improves the cycle and rate performances
of the LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> electrode at the cutoff voltage of 4.6 V. The 5 wt % Li<sub>2</sub>WO<sub>4</sub>-mixed LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> electrode delivers a reversible capacity of 199.2 mA
h g<sup>–1</sup> and keeps 73.1% capacity for 200 cycles at
1 C. It retains 67.4% capacity after 200 cycles at 2 C and delivers
a discharge capacity of 167.3 mA h g<sup>–1</sup> at 10 C,
while those of the pristine electrode are only 44.7% and 87.5 mA h
g<sup>–1</sup>, respectively. It is shown that the structure
of the LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> cathode material is not affected by mixing Li<sub>2</sub>WO<sub>4</sub>. The introduced Li<sub>2</sub>WO<sub>4</sub> effectively
restrains the LiPF<sub>6</sub> and carbonate solvent decomposition
by consuming PF<sub>5</sub> at high cutoff voltage, forming a stable
cathode/electrolyte interface film with low resistance
Selective Recovery of Li and Fe from Spent Lithium-Ion Batteries by an Environmentally Friendly Mechanochemical Approach
Recycling
of spent LiFePO<sub>4</sub> batteries has drawn recent
attention relating to recovering their high contents of rare elements
and negating potential negative environmental effects of their disposal.
However, the stable crystal structure of LiFePO<sub>4</sub> materials
has prevented the development of a recycling process with high selectivity
and extraction efficiency. We report the selective extraction of Fe
and Li from spent LiFePO<sub>4</sub> batteries via an environmentally
friendly mechanochemical process with oxalic acid. With the use of
a mechanochemical treatment and water leaching, the Li extraction
efficiency can be improved to 99%. Furthermore, 94% of Fe can be simultaneously
recovered as FeC<sub>2</sub>O<sub>4</sub>·2H<sub>2</sub>O. To
understand the reaction mechanism and determine the optimum reaction
conditions, we investigated various parameters, including the LiFePO<sub>4</sub> to oxalic acid mass ratio, rotation speed, milling time,
and ball-to-powder mass ratio. Moreover, metal ions from the water
leaching process were recovered by chemical precipitation. This study
provides an efficient and selective process for recovery of valuable
metals from spent LiFePO<sub>4</sub> materials
Mesoporous Silica-Supported Manganese Oxides for Complete Oxidation of Volatile Organic Compounds: Influence of Mesostructure, Redox Properties, and Hydrocarbon Dimension
Manganese oxides supported on ordered
mesoporous silicas and nonordered
commercial silicas were comparatively studied in terms of physical
properties and catalytic behavior in the complete oxidation of propane, <i>n</i>-decane, toluene, and <i>p</i>-cymene. Manganese
oxides are well-dispersed on large-pore SBA-15, KIT-6, and commercial
silicas, whereas they agglomerate on small-pore HMS and MCM-41. Mn/SBA-15
contains oxide species with the best reducibility, but its two-dimensional
mesopores are significantly blocked. The alkane removal efficiency
depends on the amount of accessible manganese oxides; therefore, the
three-dimensional Mn/KIT-6 shows better performance than the pore-blocked
Mn/SBA-15. In contrast, the ignition of aromatic hydrocarbons, which
needs higher temperatures than alkanes, seems more strongly dependent
on the reducibility, and Mn/SBA-15 shows the lowest ignition temperatures.
Despite their much smaller surface areas, nonordered commercial silicas
present significant advantages in the catalytic removal of large-molecule
hydrocarbons due to the favorable mass transfer in the short mesopores
within their thin particles
Supporting information from High-density polyethylene crystals with double melting peaks induced by ultra-high-molecular-weight polyethylene fibre
High-density polyethylene (HDPE)/ultra-high-molecular-weight polyethylene (UHMWPE) fibre composites were prepared via solution crystallization to investigate the components of epitaxial crystal growth on a highly oriented substrate. Scanning electron microscopy morphologies of HDPE crystals on UHMWPE fibres revealed that the edge-on ribbon pattern crystals a formed initially on UHMWPE fibres converted afterwards to a sheet shape as crystallization progressed. Wide-angle X-ray diffraction confirmed that the polymer chain oriented along the fibre axis and the orthorhombic crystal form of HDPE remained unchanged in HDPE/UHMWPE fibre composite systems. The thermal behaviour of the fibre composites measured by differential scanning calorimetry showed double melting peaks, the nature of which, as disclosed by partial melting experiments, is ascribed to bilayer components existing in the induced crystals: the inner layer is composed of more regularly folded chain crystals induced by UHMWPE fibres, and the outer layer formed on the inner one with a thinner and lower ordered crystal structure
Supporting information from High density polyethylene crystals with double melting peaks induced by ultra-high molecular weight polyethylene fibre
High density polyethylene (HDPE)/ultra-high molecular weight polyethylene (UHMWPE) fibre composite as an example were prepared via solution crystallization to investigate the components of crystals growth epitaxially on highly oriented substrate. Scanning electron microscopy (SEM) morphologies of HDPE crystals on UHMWPE fibres revealed that edge-on ribbon pattern crystals formed initially on UHMWPE fibres converted afterwards to sheet shape as crystallization time goes on. Wide-angle X-ray diffraction (WAXD) uncovered that the polymer chain oriented along fibre axis and orthorhombic crystal form of HDPE remained unchanged in HDPE/UHMWPE fibre composite systems. Thermal behaviour of fibre composites measured by differential scanning calorimetry (DSC) showed double melting peaks, the nature of which disclosed by partial melting experiments is ascribed to bilayer components existing in the induced crystals: inner layer is composed of more regularly folded chain crystals induced by UHMWPE fibre; outer layer formed on the inner one with thinner and lower ordered crystal structure
High-Performance Near-Infrared Photodetectors Based on p‑Type SnX (X = S, Se) Nanowires Grown <i>via</i> Chemical Vapor Deposition
Because of the distinct electronic
properties and strong interaction with light, quasi-one-dimensional
nanowires (NWs) with semiconducting property have been demonstrated
with tremendous potential for various technological applications,
especially electronics and optoelectronics. However, until now, most
of the state-of-the-art NW photodetectors are predominantly based
on the n-type NW channel. Here, we successfully synthesized p-type
SnSe and SnS NWs <i>via</i> the chemical vapor deposition
method and fabricated high-performance single SnSe and SnS NW photodetectors.
Importantly, these two NW devices exhibit an impressive photodetection
performance with a high photoconductive gain of 1.5 × 10<sup>4</sup> (2.8 × 10<sup>4</sup>), good responsivity of 1.0 ×
10<sup>4</sup> A W<sup>–1</sup> (1.6 × 10<sup>4</sup> A
W<sup>–1</sup>), and excellent detectivity of 3.3 × 10<sup>12</sup> Jones (2.4 × 10<sup>12</sup> Jones) under near-infrared
illumination at a bias of 3 V for the SnSe NW (SnS NW) channel. The
rise and fall times can be as efficient as 460 and 520 μs (1.2
and 15.1 ms), respectively, for the SnSe NW (SnS NW) device. Moreover,
the spatially resolved photocurrent mapping of the devices further
reveals the bias-dependent photocurrent generation. All these results
evidently demonstrate that the p-type SnSe and SnS NWs have great
potential to be applied in next-generation high-performance optoelectronic
devices
MOESM4 of Granulin epithelin precursor promotes colorectal carcinogenesis by activating MARK/ERK pathway
Additional file 4. Univariable and multivariable Cox regression of prognostic parameters for overall survival in 190 patients with colorectal cancer
MOESM2 of Granulin epithelin precursor promotes colorectal carcinogenesis by activating MARK/ERK pathway
Additional file 2. Clinicopathological factors predicted prognosis for 190 CRC patients
MOESM1 of Granulin epithelin precursor promotes colorectal carcinogenesis by activating MARK/ERK pathway
Additional file 1. SuperArray SureSilencing shRNA plasmids mediated GEP knockdown
MOESM3 of Granulin epithelin precursor promotes colorectal carcinogenesis by activating MARK/ERK pathway
Additional file 3. Univariable and multivariable Cox regression of prognostic parameters for disease free survival in 190 patients with colorectal cancer