Iron (Fe)-based layered oxide cathodes that employ Fe 3+ /Fe 4+ redox reaction present a family of attractive cathode materials for sodium-ion batteries as iron is abundant, low-cost, and environmentally benign. However, their electrochemical performance not yet satisfactory requires further improvement. In this study, we investigate the effect electrolytes on α -NaFeO 2 , prototypical model Fe...

Six NASICON type samples with Na4-xVFexMn1-x(PO4)3 (0 ≤ x 1) stoichiometry are examined as positive electrodes for sodium-ion batteries. The structural, morphological, and chemical state of elements in raw is unveiled by XRD diffraction, electron microscopy, Raman XPS spectroscopies. effect the dual Fe/Mn substitution electrochemical tests using both voltammetric galvanostatic methods. results ...

   Electrochemical performance of binary and ternary oxides composed of Ni, Co and Cu produced over a 3-dimensional substrate of vertically aligned carbon nano-tubes (VACNT) as electrodes for aqueous energy sources, is reported and compared in this paper. VACNTs were fabricated inside a DC-plasma enhanced chemical vapor deposition chamber and composite materials fabricated by thermal decomp...

A rechargeable cement-based battery was developed, with an average energy density of 7 Wh/m2 (or 0.8 Wh/L) during six charge/discharge cycles. Iron (Fe) and zinc (Zn) were selected as anodes, nickel-based (Ni) oxides cathodes. The conductivity electrolytes modified by adding short carbon fibers (CF). electrodes produced two methods: powder-mixing metal-coating. Different combinations cells test...

the saline tannery wastewater also contains the high concentration of organic materials and various chemical compounds like lime, sodium sulfite, sulfate ammonium, sodium chloride, disinfections, vegetable tannins, salts of chromium and chloride. in recent years different applications of advanced oxidation processes (aops) are applied to remove organic loading (cod) from wastewater. advanced ox...

there are the different treatments, such as: drugs, psychotherapy, cognitive therapy and behavior therapy, for management of anxiety. but nowadays, an intervention called ”neuro-feedback” which is combination of electronic, behavior, neurology and pharmacology sciences has been innovated in which the neurons can be growth and reinforced and the brain’s function will be increased. in this interv...

the coordinate transformation allows the exact calculation of some electrode configurations. in this paper the prolate spherical coordination transformation is used to calculate the field of a hyperboloiderod against plan electrode. the exact field is caculated using two new parameters: 1) electrodes spacing and 2) the radius of curvature of the tip of the rod electrode. the partial discharge i...

• Catalysts based on nitrogen- and iron-doped high surface area carbon support. Effect of N-source pyrolysis atmosphere oxygen reduction rection (ORR). Tailoring chemistry active sites to enhance ORR in alkaline environment. High durability over start-stop cycling tests. Fe-N-C catalysts were synthesized from a nitrogen iron wet impregnation black pearls followed by steps. Three different sourc...