Sodium ascorbate assisted uniform distribution of Fe₃O₄ nanoparticles on rGO surface: improved cycling and rate performance of rGO/Fe₃O₄ anode material for lithium ion batteries

Abstract

However, the effects of reducing agents of graphite oxide (GO) on the detailed morphology of the composite were rarely reported. Herein, reducing agents of GO, sodium ascorbate and hydrazine hydrate were selected, and sodium ascorbate was able to control the uniform distribution of Fe 3 O 4 on rGO sheets, resulting in stable cycling performance of above 500 mA h g 21 after 100cycles and high capacity of above 1200 mA h g 21 in the first discharge/charge process. While in the composite reduced by hydrazine hydrate, severe aggregation of Fe 3 O 4 particles and their weak bonding to rGO sheets depleted the buffer effect of rGO, resulting in continuously fading of cycling performance. This work provided a convenient and an effective way of morphology control of rGO-Fe 3 O 4 composite during its one-pot formation.

Metal–Organic‐Framework‐Derived Nanostructures as Multifaceted Electrodes in Metal–Sulfur Batteries

“…Particularly, transition metallic compounds, including transition metallic oxides, sulfides, nitrides, phosphides, etc., are promising materials owing to their fascinating physicochemical performances relying on varying metal cations and inorganic anions. [ 178–187 ] Most transition metallic compounds possess conductivity and polar surfaces applicable for catalytic reaction with sulfur species, therefore, occupying the most significant part in catalytic hosts for MSBs.…”

Engineering MOFs‐Derived Nanoarchitectures with Efficient Polysulfides Catalytic Sites for Advanced Li–S Batteries

“…Distinguish from traditional inorganic porous nanocatalysts, MOFs‐derived catalytic materials have the advantages of uniform distribution of active sites, accessible specific surface area, and superior catalytic performance. [ 228–232 ] In recent years, MOFs‐derived polar metal compounds, including transition oxides, [ 233 ] sulfides, [ 234,235 ] nitrides, [ 236 ] and phosphides, [ 237 ] have abundant metal active centers and polar surfaces, which are suitable for chemical reactions with sulfur species. Therefore, researchers have paid much attention to the development of LSBs catalytic materials.…”

Sonosynthesis of pyranochromenes and biscoumarins catalyzed by Co3O4/NiO@GQDs@SO3H nanocomposite

“…Synthesis of highly efficient nanocomposite catalysts for the synthesis of organic compounds is still an attractive challenge. To obtain larger surface area and more active sites, nanocatalysts are functionalized by active groups [31][32][33]. It has been demonstrated that the decoration of the nanocatalyst with GQDs prevents the aggregation of fine particles and thus increases the effective surface area and number of reactive sites for an efficient catalytic reaction.…”

“…The chemical groups on a GQD are able to catalyze chemical reactions. The -COOH and -SO 3 H groups can serve as acid catalysts for many reactions [26][27][28][29][30][31][32][33][34]. Herein, we reported the use of Co 3 O 4 / NiO@GQDs@SO 3 H nanocomposite as a new efficient catalyst for the preparation of pyranochromenes and biscoumarins under ultrasonic irradiations in ethanol (Scheme 1).…”