Background and Purpose-Ischemic postconditioning has been found to decrease brain infarct area and spinal cord ischemic injury. In this study, we tested the hypothesis that ischemic postconditioning reduces global cerebral ischemia/reperfusion-induced structural and functional injury in rats. Methods-Ten-minute global ischemia was induced by 4-vessel occlusion in male Sprague-Dawley rats.
Manganese dioxides (MnO2) are considered one of the most attractive materials as an oxygen evolution reaction (OER) electrode due to its low cost, natural abundance, easy synthesis, and environmental friendliness. Here, metal‐ion (Fe, V, Co, and Ni)‐doped MnO2 ultrathin nanosheets electrodeposited on carbon fiber paper (CFP) are fabricated using a facile anodic co‐electrodeposition method. A high density of nanoclusters is observed on the surface of the carbon fibers consisting of doped MnO2 ultrathin nanosheets with an approximate thickness of 5 nm. It is confirmed that the metal ions (Fe, V, Co, and Ni) are doped into MnO2, improving the conductivity of MnO2. The doped MnO2 ultrathin nanosheet/CFP and the IrO2/CFP composite electrodes for OER achieve a low overpotential of 390 and 245 mV to reach 10 mA cm−2 in 1 m KOH, respectively. The potential of the doped composite electrode for long‐term OER at a constant current density of 20 mA cm−2 is much lower than that of the pure MnO2 composite electrode.
Cobalt telluride branched nanostructures on carbon fiber paper (CFP) with two different morphologies were synthesized via solution-based conversion reaction. Both the CoTe2 with nanodendrite and CoTe with nanosheet morphologies on the CoTe2 nanotube (CoTe2 NDs/CoTe2 NTs and CoTe NSs/CoTe2 NTs) supported by CFP exhibit high activities toward hydrogen evolution reaction (HER). Particularly, the CoTe NSs/CoTe2 NTs only require an overpotential of 230.0 mV to deliver the current density of 100 mA cm(-2) in acid solution. After cycling for 5000 cycles or 20 h continual electrolysis, only a small performance loss is observed.
Developing an efficient, stable and low-cost noble-metal-free electrocatalyst for the hydrogen evolution reaction (HER) is an effective way to alleviate the energy crisis. Herein, we report a simple and facile...
Here,
we demonstrate that nonprecious CoFe-based oxide nanoarrays
exhibit excellent electrocatalytic activity and superior stability
for electrochemical oxygen evolution reaction (OER) at large current
densities (>500 mA cm–2). Carbon fiber paper
(CFP)
with three-dimensional macroporous structure, excellent corrosion
resistance, and high electrical properties is used as the support
material to prevent surface passivation during the long-term process
of OER. Through a facile method of hydrothermal synthesis and thermal
treatment, vertically aligned arrays of spinel Co
x
Fe3–x
O4 nanostructures
are homogeneously grown on CFP. The morphology and the Fe-doping content
of the CoFe oxide nanoarrays can be controlled by the Fe3+ concentration in the precursor solution. The arrays of CoFe oxide
nanosheets (NSs) grown on CFP (Co2.3Fe0.7O4-NSs/CFP) deliver lower Tafel slope (34.3 mV dec–1) than CoFe oxide nanowire (NW) arrays grown on CFP (Co2.7Fe0.3O4-NWs/CFP) in alkaline solution, owing
to higher Fe-doping content and larger effective specific surface
area. The Co2.3Fe0.7O4-NSs/CFP electrode
exhibits excellent stability for OER at large current densities in
alkaline solution. Moreover, the morphology and structure of CoFeO
nanoarrays are well preserved after long-term testing, indicating
the high stability for OER.
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