Enhanced Electrochemical Behavior of Peanut-Shell Activated Carbon/Molybdenum Oxide/Molybdenum Carbide Ternary Composites.

Biomass-waste activated carbon/molybdenum oxide/molybdenum carbide ternary composites are prepared using a facile in-situ pyrolysis process in argon ambient with varying mass ratios of ammonium molybdate tetrahydrate to porous peanut shell activated carbon (PAC). The formation of MoO and MoC nanostructures embedded in the porous carbon framework is confirmed by extensive structural characterization and elemental mapping analysis. The best composite when used as electrodes in a symmetric supercapacitor (PAC/MoO/MoC-1//PAC/MoO/MoC-1) exhibited a good cell capacitance of 115 F g with an associated high specific energy of 51.

Ex-situ nitrogen-doped porous carbons as electrode materials for high performance supercapacitor.

Nitrogen (N) doping of porous carbon materials is an effective strategy for enhancing the electrochemical performance of electrode materials. Herein, we report on ex-situ (post) nitrogen-doped porous carbons prepared using a biomass waste, peanut shell (PS) as a carbon source and melamine as the nitrogen source. The synthesis method involved a two-step mechanism, initial chemical activation of the PS using KOH and post N-doping of the activated carbon.

Nitridation Temperature Effect on Carbon Vanadium Oxynitrides for a Symmetric Supercapacitor.

In this work, porous carbon-vanadium oxynitride (C-VNO) nanostructures were obtained at different nitridation temperature of 700, 800 and 900 °C using a thermal decomposition process. The X-ray diffraction (XRD) pattern of all the nanomaterials showed a C-VNO single-phase cubic structure. The C-VNO obtained at 700 °C had a low surface area (91.

Three dimensional vanadium pentoxide/graphene foam composite as positive electrode for high performance asymmetric electrochemical supercapacitor.

The electrochemical performance of hydrothermal synthesized three dimensional (3D) orthorhombic vanadium pentoxide (VO) nanosheets and vanadium pentoxide/graphene foam (VO/GF) composites at different mass loading of GF were successfully studied. The optimized VO/GF-150 mg composite provided a high specific capacity of 73 mA h g, which was much higher than that the pristine VO (60 mA h g) nanosheets at a specific current of 1 A g. A hybrid capacitor was also fabricated by adopting a carbon-based negative electrode obtained from the pyrolysis of an iron-PANI polymer (C-Fe/PANI) mixture and the 3D VO/GF-150 mg composite as the positive electrode in 6 M KOH electrolyte.

[Community participation for a latrine project in Senegalese rural area].

The rural community of Ngohé faces serious hygiene and sanitation problems because of the poor quality of water, and in particular due to the lack of latrines in shelters. As of 2003, a three-year project for the construction of latrines was initiated within the framework of a donor agency programme to support the health region of Diourbel. After three years of activity, the poor results recorded provided considerable justification for the analysis of community participation in the project.

[Factors related to failure to complete immunization of children aged 10-23 months in Ndoulo (Senegal)].

Introduction: Avoidable diseases cause more than two million deaths worldwide every year. In sub-Saharan Africa, only half of all children receive their complete vaccine series. In Senegal, an expanded program of immunization began as a pilot program in 1979 and was generalised in 1985.