Sodium hypophosphite

About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.

A facile and cost-effective approach to the reduction of exfoliated graphite oxide using sodium hypophosphite under acidic conditions

Abstract: Herein we demonstrate that graphene production could be implemented through the chemical reduction of an exfoliated graphite oxide (GO) suspension using a sodium hypophosphite–hydrochloric acid mixture. The structure and composition of the resultant reduced GO (RGO) were confirmed by XRD, XPS and Raman spectra. The RGO exhibited high C/O atomic ratio (13.5), excellent thermal stability and high electrical conductivity (up to 380 S m−1). We speculate that the strong reducibility of hypophosphorous acid derived from a sodium hypophosphite–hydrochloric acid solution is the main mechanism for oxygen reducing and graphite restructuring of GO sheets. Considering that all the raw materials used are of very low toxicity and widely available, this facile and green technique presented here will provide a promising method for the production of graphene on an industrial scale.

Transfer hydrogenation of furaldehydes with sodium phosphinate as a hydrogen source using Pd-supported alumina catalyst

Abstract: Transformations of furaldehydes to the corresponding furfuryl alcohols via hydrogenation with sodium hypophosphite (NaH2PO2) as a hydrogen donor agent were performed over Pd/Al2O3 catalyst under ambient condition in THF/water solvent. Furfuryl alcohol (FOL), 5-methylfurfuryl alcohol (5-MFOL) and 2,5-bis(hydroxymethyl)furan (BHMF), were produced with 68%, 45% and 63% yield, respectively, from 2-furaldehyde (furfural), 5-methylfulaldehyde (5-MF) and 5-hydroxymethyl-2-furaldehyde (HMF) at room temperature (25 °C). The Pd/Al2O3 catalyst was reusable for all reaction without significant decrease in activity. These results indicated that the NaH2PO2 would be a cheap and an easy-handling hydrogen donor for catalytic hydrogenation reactions under mild conditions.

Electrodeposition of CoWP film II. Effect of electrolyte concentration

Abstract: CoWP films were electrodeposited on copper-coated silicon wafers from citrate electrolyte containing cobalt sulphate, sodium tungstate and sodium hypophosphite at room temperature potentiostatically. The effects of electrolyte concentration on thickness, composition and microstructure of the films were studied. It was observed that the deposition current density and thickness increased with increasing cobalt and hypophosphite ion concentrations, whereas an increase in tungstate ion concentration resulted in a decrease in current density and thickness. Films with larger variations of cobalt (from 64 to 83 at.%), tungsten (from 0.5 to 24 at.%) and phosphorus (from 6 to 21 at.%) were electrodeposited by controlling the concentrations of the electrolytes. X-ray diffraction studies suggested that films containing ∼20 at.% phosphorus were amorphous while films with lower phosphorus content were crystalline. SEM and AFM examinations showed that the size of crystallites and surface roughness were mainly dependent on the amount of phosphorus present in the films.

Nickel Plating by Chemical Reduction

Abstract: Brenner and Riddell1 have described a method for nickel and cobalt plating by chemical reduction of the metal salts with sodium hypophosphite under both acid and alkaline conditions. Aside from its utility, this reaction is one of considerable interest by virtue of its catalytic nature. Thus, in the concentrations they use, deposition occurs only if certain metals are immersed in the solution and, even in their presence, deposition is inhibited by the addition of such materials as potassium thiocyanate and lead in small amounts. It is suggested that some insight on both these effects and also on the unusual kinetics of the reaction is obtained by the mechanisms outlined below.