Topic
Sodium sulfide
About: Sodium sulfide is a research topic. Over the lifetime, 2851 publications have been published within this topic receiving 27733 citations. The topic is also known as: disodium sulfide.
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TL;DR: In this article, a surface conductivity technique was used to measure the Fermi level position of samples with and without sodium sulfide treatment, and the results showed that the surface is not unpinned.
Abstract: Recent evidence suggests that sodium sulfide treatment of GaAs surfaces results in the reduction of surface recombination and in Fermi level unpinning. We have used a surface conductivity technique to measure the Fermi level position of samples with and without sodium sulfide treatment. This method has specific advantages over spectroscopic techniques for studying thin films on GaAs. Photoluminescence (PL) measurements were used to qualitatively evaluate surface recombination. We conclude that while the reduction of surface recombination is attained, the surface is not unpinned.
62 citations
TL;DR: Neither oxygen, thiosulfate, nor the combination potentiated the protective effects of nitrite against sulfide poisoning, which is clearly superior to that of oxygen, which was the more widely recommended antidote.
Abstract: Oxygen (100% at 1 atmosphere) did not protect mice against death from acute sulfide poisoning as compared with animals maintained under air at 1 atmosphere. Sodium thiosulfate had a small, but statistically significant (P <.05) protective effect against death due to sodium sulfide, whether the mice were maintained under air or oxygen. Pretreatment with sodium nitrite, however, increased the acute intraperitoneal lethal dose for 50% survival of the group (LD50) of sodium sulfide 2.5 times. Neither oxygen, thiosulfate, nor the combination potentiated the protective effects of nitrite against sulfide poisoning. Antidotal effects of nitrite in acute sulfide poisoning were demonstrated in rats. The therapeutic efficacy of nitrite in acute sulfide poisoning is clearly superior to that of oxygen, which is the more widely recommended antidote.
62 citations
TL;DR: A 3D network (Ni‐NCFs) host composed by nitrogen‐doped carbon fibers and Ni hollow spheres is synthesized by electrospinning and reveals that a small amount of Ni is polarized during the sulfur‐loading process forming a polar Ni—S bond, which facilitates the catalysis of the Ni unit for the redox of sodium polysulfide.
Abstract: The high energy density of room temperature (RT) sodium-sulfur batteries (Na-S) usually rely on the efficient conversion of polysulfide to sodium sulfide during discharging and sulfur recovery during charging, which is the rate-determining step in the electrochemical reaction process of Na-S batteries. In this work, a 3D network (Ni-NCFs) host composed by nitrogen-doped carbon fibers (NCFs) and Ni hollow spheres is synthesized by electrospinning. In this novel design, each Ni hollow unit not only can buffer the volume fluctuation of S during cycling, but also can improve the conductivity of the cathode along the carbon fibers. Meanwhile, the result reveals that a small amount of Ni is polarized during the sulfur-loading process forming a polar Ni-S bond. Furthermore, combining with the nitrogen-doped carbon fibers, the Ni-NCFs composite can effectively adsorb soluble polysulfide intermediate, which further facilitates the catalysis of the Ni unit for the redox of sodium polysulfide. In addition, the in situ Raman is employed to supervise the variation of polysulfide during the charging and discharging process. As expected, the freestanding S@Ni-NCFs cathode exhibits outstanding rate capability and excellent cycle performance.
62 citations
TL;DR: In this paper, the results showed that the lead recovery was significantly affected by the sodium sulfide concentration and the collector concentration, which was 3 times more than that for pure anglesite.
61 citations
TL;DR: In this paper, an inexpensive 3D electrode of Ni 3 S 2 @Ni foam was obtained through a hydrothermal condition using sodium sulfide as corrodent and Ni foam as both substrate and Ni source.
61 citations