Effective hydrogen storage capacity
is a key factor for applications
of solid-state hydrogen storage technology. In this work, V-based
solid solution alloys were prepared and the effect of codoping Cr
and the rare-earth Y element on the crystal microstructure and reversible
hydrogen storage properties were investigated. The results revealed
that the hydrogen absorption of Ti–V–Mn–Cr–Y
alloys could exceed 90% of the maximum hydrogen capacity within 50
s at 6 MPa hydrogen pressure, and the alloy Ti0.9Y0.1V1.1Mn0.8Cr0.1 can absorb
maximum 3.71 wt % hydrogen capacity, and the effective hydrogen capacity
above 0.1 MPa can reach 2.53 wt % at 423 K. Furthermore, the dehydriding
thermodynamic parameters revealed a significant tendency toward easier
dehydrogenation with codoping of trans-metal and rare-earth metal
elements.
The development of long-term stable Zn anodes capable
of operating
at high current densities and/or capacities remains a huge challenge.
Herein, through the rapid potassium permanganate solution treatment
and laser lithography, we have developed a gradient Zn anode (LLP@Treated
Zn) with the insulating and hydrophobic passivated-layer at the top
and conductive and hydrophilic fresh-zinc-layer at the bottom. This
makes the passivation layer prevent the Zn anodes from corrosion
and side reactions and induce the preferential deposition of Zn at
the bottom of the microchannel without dendrite growth. As a consequence,
the LLP@Treated Zn anodes exhibit a stable cycle life for over 700
h at 10 mA cm–2 and 5 mAh cm–2. Moreover, the Zn anodes with different surface morphologies (ring,
lattice, etc.) could also be obtained by laser lithography, which
proves the flexibility of the pulsed laser lithography strategy in
the preparation of battery materials.
Aqueous Zn-based batteries deliver thousands of cycles at high rates but poor recyclability at low rates. Herein, we reveal that such illogical phenomenon is attributed to the reconstructed electrode/electrolyte interface...
In this paper, we report the synthesis, crystal structure, photophysical properties, and electronic nature of a phosphorescent Cu(I) complex of [Cu(TBT)(POP)]BF 4 , where TBT and POP stand for 4,5,9,14-tetraaza-benzo[b]-triphenylene and bis(2-(diphenylphosphanyl)phenyl) ether, respectively. [Cu(TBT)(POP)]BF 4 renders a red phosphorescence peaking at 622 nm, with a long excited-state lifetime of 13.2 ls. Density functional calculation reveals that the emission comes from a triplet metal-to-ligandcharge-transfer excited state. We electrospun composite nanofibers of [Cu(TBT)(POP)]BF 4 and polystyrene, hoping to explore the possibility of replacing precious-metal-based oxygen sensors with cheap Cu-based ones. The finally obtained samples with average diameter of *700 nm exhibit a maximum sensitivity of 5.8 toward molecular oxygen with short response/recovery time (5/13 s) due to the large surface-area-to-volume ratio of nanofibrous membranes. No photobleaching is detected in these samples. All these results suggest that phosphorescent Cu(I) complexes doped nanofibrous membranes are promising candidates for low-cost and quick-response oxygen-sensing materials.
A new spectrophotometric method for the determination of protein has been developed using the property that bovine serum albumin and DBC-chlorophosphonazo form a compound. The maximum absorption wavelength of the compound is 606 nm. Beer's law is obeyed over the range of 25-250 µg/mL of bovine serum albumin contents. The detection limit of this method is 9.52 µg/mL. Protein content in human serum has been successfully determined.
Neurodegenerative diseases (NDs) are a widespread and serious global public health burden, particularly among the older population. At present, effective therapies do not exist, despite the increasing understanding of the different mechanisms of NDs. In recent years, some drugs, such as galantamine, entacapone, riluzole, and edaravone, have been proposed for the treatment of different NDs; however, they mainly concentrate on symptom management and confer undesirable side effects and adverse reactions. Therefore, there is an urgent need to find novel drugs with fewer disadvantages and higher efficacy for the treatment of NDs. Mushroom polysaccharides are macromolecular complexes with multi-targeting bioactivities, low toxicity, and high safety. Some have been demonstrated to exhibit neuroprotective effects via their antioxidant, anti-amyloidogenic, anti-neuroinflammatory, anticholinesterase, anti-apoptotic, and anti-neurotoxicity activities, which have potential in the treatment of NDs. This review focuses on the different processes involved in ND development and progression, highlighting the neuroprotective activities and potential role of mushroom polysaccharides and summarizing the limitations and future perspectives of mushroom polysaccharides in the prevention and treatment of NDs.
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