National Chemical Laboratory

About: National Chemical Laboratory is a facility organization based out in Pune, Maharashtra, India. It is known for research contribution in the topics: Catalysis & Nanoparticle. The organization has 8891 authors who have published 14837 publications receiving 387600 citations.

In situ preparation of N–ZnO/graphene nanocomposites: excellent candidate as a photocatalyst for enhanced solar hydrogen generation and high performance supercapacitor electrode

Abstract: We have demonstrated a facile in situ wet chemical method to synthesize nanostructured nitrogen doped ZnO/Graphene (N–ZnO/GR) nanocomposites for the first time. Nitrogen doped ZnO over graphene (N–ZnO/GR) was studied using various concentrations of graphene. During the synthesis of N–ZnO/GR nanocomposites, in situ formation of graphene via GO reduction and formation of 4–9 nm N–ZnO have been demonstrated. The composite N–ZnO/GR absorbs in the visible region and this property is used for the photocatalytic reaction to transform hazardous H2S waste into eco-friendly hydrogen using solar light. The N–ZnO/GR nanocomposite with 0.3% graphene exhibits an enhanced photocatalytic stable hydrogen production rate i.e. ∼5072 μmol h−1 under visible light irradiation. It is noteworthy that the N–ZnO/GR electrode exhibits a high specific capacitance of 555 F g−1 and excellent cyclic performance with nearly 96.20% capacity retention after 2000 cycles at a current density of 10 A g−1. These results indicate great potential applications of N–ZnO/GR in developing high hydrogen production and supercapacitors with high energy and power densities.

One-pot synthesis of 5-Hydroxymethylfurfural by cellulose hydrolysis over highly active bimodal micro/mesoporous H-ZSM-5 catalyst

Abstract: Direct synthesis of 5-hydroxymethylfurfural (5-HMF), a useful renewable biofuel and biochemical, was systematically studied by hydrolysis of microcrystalline cellulose over Bimodal-HZ-5 zeolite. Bimodal-HZ-5 zeolite obtained by post-synthesis modification of H-ZSM-5 with desilication was found to be a potential heterogeneous catalyst with 67% cellulose conversion and 46% yield of 5-HMF. Bimodal-HZ-5 was observed to be reusable for four cycles, without any loss in activity. The detailed optimization of process parameters and catalyst reusability are also presented. The present study opens a new avenue for the renewable one-pot synthesis of 5-HMF, a valuable product.

Profile of Neuropsychological Deficits in Older Stroke Survivors without Dementia

Abstract: Background: Few studies have examined the profile of cognitive impairments in older stroke patients without dementia. Method: A standardized evaluation including

Spin states of Mn and Co in LaMn 0.5 Co 0.5 O 3

Abstract: High-temperature susceptibility measurements have indicated that the spin states of Mn and Co are different in the two different phases of the ferromagnetic oxide ${\mathrm{LaMn}}_{0.5}{\mathrm{Co}}_{0.5}{\mathrm{O}}_{3}.$ Mn and Co ions are present in their trivalent state as high-spin ${\mathrm{Mn}}^{3+}$ and low-spin ${\mathrm{Co}}^{3+}$ in the high-${T}_{c}$ ${(T}_{c}\ensuremath{\approx}225 \mathrm{K})$ phase of the compound whereas in the low-${T}_{c}$ ${(T}_{c}\ensuremath{\approx}150 \mathrm{}\mathrm{K})$ phase, they are present as ${\mathrm{Mn}}^{4+}$ and ${\mathrm{Co}}^{2+}.$ Evidently, the ferromagnetic superexchange interactions are of different origins in the two different phases of ${\mathrm{LaMn}}_{0.5}{\mathrm{Co}}_{0.5}{\mathrm{O}}_{3}.$