Abstract Vanadium redox flow battery (VRB) has attracted enormous attention as a large-scale energy storage system owing to its long life, stable capacity and high safety. The electrode porosity plays crucial role in the performance of VRB. This work reports effect on electrocatalytic activity charge transfer VRB using spent tea derived porous carbon material. microstructure is systematically m...

The validity of estimating the solid phase diffusion coefficient, D s , of a lithium intercalation electrode from impedance measurement by a modified electrochemical impedance spectroscopy ~EIS! method is studied. A macroscopic porous electrode model and concentrated electrolyte theory are used to simulate the synthetic impedance data. The modified EIS method is applied for estimating Ds . The ...

Two-dimensional textured carbon fiber is an excellent electrode material and/or supporting substrate for active materials in fuel cells, batteries, and pseudocapacitors owing to its large surface area, high porosity, ultra-lightness, good electric conductivity, and excellent chemical stability in various liquid electrolytes. And Nickel hydroxide is one of the most promising active materials tha...

Carbon nanofiber nonwovens (CFN) are powerful electrode materials with exceptional performance in energy storage devices, such as batteries and supercapacitors. Small fiber-diameters together hierarchical porosity endow CFN-electrode large surface areas high electrical capacitance. Porosity of the fiber is often realized by corrosive activation methods wet-etching or using oxidative gases at el...

The parameters to prepare α-Al2O3 coatings by double glow plasma technique were optimized to obtain dense and thick α-Al2O3 coatings on 316 L stainless steel at low temperature of 580 °C. The parallel distance between the source electrode and the substrate, working pressure, source electrode voltage, and workpiece electrode voltage were designed by L9 Orthogonal array design. The thickness, mic...

This work proposes the use of electrochemical cells (bipolar or series) like mechanism recuperate of impurities and noble species, from contaminated or impoverished electrolytes. The treated fluid circulates through porous or perforated electrodes of compound material. In order to produce successive, selective deposits of the different chemical substances, these electrodes are located spaced by...

A transient modelling framework for a vanadium redox-flow battery (RFB) is developed and experiments covering a range of vanadiumconcentration and electrolyte flow rate are conducted. The two-dimensional model is based on a comprehensive description of mass, charge and momentum transport and conservation, and is combined with a global kinetic model for reactions involving vanadium species. The ...

Hydrazine in water samples is determined by constant current chronopotentiometry in porous carbon electrodes. Hydrazine in alkaline solutions is oxidised to nitrogen in the pores of the electrode by constant current. Two types of electrodes made of reticulated vitreous carbon (RVC) were used, one fabricated from crushed RVC particles, the other with the original RVC material of 100 ppi porosity...