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, the optimal cobalt content in CoOx-loaded TiO2/CdS composite is determined to be 2.1% and the corresponding rate of hydrogen evolution is 660μmolg−1/h−1, which is about 7 times higher than TiO 2/cdS and CdS photocatalysts under the same condition.
67 citations
TL;DR: In this paper, a facile and scalable method to synthesize tin nanoparticles (NPs) that are uniformly embedded within a carbon network (denoted as Sn@C composite), which can address the two primary issues of Na dendrite growth and volume expansion is presented.
Abstract: Sodium (Na) metal is one of the most appealing anode materials for grid-scale energy storage systems owing to the high earth abundance and low cost of Na resources. Nevertheless, the implementation of the Na metal anode is hindered by two primary issues associated with Na dendrite growth and volume expansion, resulting in low coulombic efficiency and poor cycle life. Herein we present a facile and scalable method to synthesize tin (Sn) nanoparticles (NPs) that are uniformly embedded within a carbon network (denoted as Sn@C composite), which can address the two issues simultaneously. Specifically, Sn NPs can serve as preferential nucleation sites to guide Na nucleation and thereby lower the Na deposition overpotential, while the carbon network can act as a buffer layer to effectively minimize the volume change and alleviate the exfoliation of Sn NPs over repeated cycles. Consequently, high-capacity Na anodes can be realized with long-term reversibility and stability. Moreover, a room-temperature Na–sulfur battery based on the Sn@C composite as an anode coupled with commercial sodium sulfide as a cathode was demonstrated to have significantly improved electrochemical performance. We believe that this work provides a new pathway for designing high-energy Na metal batteries.
66 citations
TL;DR: The preparation and electrochemical characterization of graphite electrodes modified with hexadecylpyridinium-bis(chlorilato)-antimonyl(V), [SbVO(CHL)2]Hex, (CMEs) as well as their behavior as electrocatalysts toward the oxidation of sulfide are described.
Abstract: The preparation and electrochemical characterization of graphite electrodes modified with hexadecylpyridinium−bis(chloranilato)−antimonyl(V), [SbVO(CHL)2]Hex, (CMEs) as well as their behavior as electrocatalysts toward the oxidation of sulfide are described. The self-exchange rate constant ko of immobilized [SbVO(CHL)2]Hex and the effect of the surface coverage were evaluated. [SbVO(CHL)2]Hex is a new compound. Synthesis protocol and some identification studies are given. The fabrication of screen-printed electrodes (SPEs) with a mixture of 5% (w/w) [SbVO(CHL)2]Hex/graphite powder in 1.5% (w/v) ethyl cellulose in 2-butoxyethyl acetate is also described. SPEs, poised at +0.08 mV versus Ag/AgCl, at pH 6.5 were utilized for the determination of sulfide in simulated wastewater samples. Interference of various compounds was also tested. The proposed method correlates well with a colorimetric method. Calibration graphs were linear over the range 0.01−0.7 mM sodium sulfide and the CV was 2.8% (n = 8) for 0.1 mM ...
66 citations
TL;DR: In this paper, mixed southern hardwood chips were extracted with an alkaline wood pulping solution called kraft green liquor, which contained mainly sodium carbonate and sodium sulfide.
Abstract: Mixed southern hardwood chips were extracted with an alkaline wood pulping solution called kraft green liquor. This aqueous solution containing mainly sodium carbonate and sodium sulfide was applie...
65 citations
TL;DR: In this article, the removal of the silver thiolate polymer is confirmed by mass spectrometry, and initial results indicate that fractional crystallization may be utilized to separate these large nanocrystalline compounds by their respective core sizes.
Abstract: Silver sulfide nanocrystals have been formed by the conversion of silver thiolate polymers with sodium sulfide in a dual-phase solution preparation. From transmission electron microscopy and laser desorption ionization mass spectrometry, the mean nanocrystalline diameter is estimated to be 5.4 nm. Large-angle X-ray diffraction is qualitatively consistent with the rhombic phase (acanthite) of Ag2S. The removal of the silver thiolate polymer is confirmed by mass spectrometry, and initial results indicate that fractional crystallization may be utilized to separate these large nanocrystalline compounds by their respective core sizes. Optical absorption spectroscopy indicates a band gap of 1.1 eV, which is not shifted appreciably from the bulk value for this direct band gap semiconductor.
65 citations