Ni3B/Ni heterostructures with optimized hydrogen/hydroxyl binding energies have been constructed for effective alkaline hydrogen oxidation electrocatalysis.
Abstract.Periodontitis is an oral disease that is highly prevalent worldwide, with a prevalence of 30-50% of the population in developed countries, but only ~10% present with severe forms. It is also estimated that periodontitis results in worldwide productivity losses amounting to ~54 billion USD yearly.
We
present a simple in situ sodium borohydride (NaBH4) reduction
approach to produce amorphous core–shell like
cobalt borate nanosheet-coated cobalt boride hybrid (Co-B@Co-Bi).
Benefiting from the unique rich amorphous Co-Bi layer, it exhibits
extraordinary catalytic activity and good stability toward the oxygen
evolution reaction (OER) in 1.0 M KOH, with an overpotential of 291
mV to obtain a current density of 10 mA cm–2, outperforming
most of the documented metal–metalloid-based electrocatalysts.
This reverse addition strategy might provide a promising pathway for
designing various transition metal borate and boride hybrid for more
applications.
We report enhanced transmission of broadband terahertz electromagnetic waves in the frequency range from 0.2 to 3.15 THz using silicon with micropyramid surface structures. We observe a maximum 89% reduction in reflectivity of terahertz power when the sample with 60-μm-period micropyramids is used, compared to a planar silicon substrate. By varying the period of micropyramid structures from 110 to 30 μm, the cutoff frequency of enhanced transmission is tuned from 0.74 to 2.93 THz and the bandwidth of enhancement increases from 0.91 to 3.15 THz, respectively.
In this study, phospholipidated b-cyclodextrin (PCD) was obtained by the condensation between b-cyclodextrin and phenyl phosphonic acid dichloride, which was characterized by Fourier transform infrared (FTIR) spectra, 1 H-NMR, and thermogravimetric analysis (TGA). The thermal stability and flame retardancy of the poly(lactic acid) (PLA) blends [PLA-ammonium polyphosphate (APP)-PCD] were measured by TGA coupled to FTIR spectroscopy, vertical burning test (UL-94), limiting oxygen index (LOI), and cone calorimetry tests. The results show that the mass ratio and loading amount of APP and PCD affected the properties of PLA. When the loading of APP and PCD was 30 wt % and the mass ratio of APP to PCD was 5:1, the highest LOI value of 42.6% (that of neat PLA was 19.7%) and a UL-94 V0 rating were achieved, and the reduction of the total heat release was greater than 80%. Even when the total amount of APP and PCD was decreased to 20 wt % with the same mass ratio, the flameretardant PLA still can achieved a UL-94 V0 rating. The improved performance was explained by the formation of an intumescent, continuous, contact char layer. Moreover, the reaction between APP and PCD contributed to the improvement of the thermal stability of the char residue.
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