The technology is quite simple. A pair of carbon rod electrodes areconnected to a current limited source of power - 115 V AC or DC in serieswith a 1500 W space heater, for example. They are mounted on a wellinsulated, fire proof structure which allows the distance between the rodsto be controlled.
Inexpensive carbon fiber rod electrodes (CFRE) in three diameters of 0.8 mm, 2 mm and 3 mm were used for voltammetric determination of 5-amino-6-nitroquinoline (5A6NQ) based either on its anodic oxidation or cathodic reduction using direct current voltammetry and differential pulse voltammetry. CFRE is based on carbon fiber rod, which consists of lengthwise oriented long carbon fibers coated from outer side by epoxy resin, connected to copper wire by conducting paint. The electrode material is inexpensive, commercially available at very low cost and at various shapes and sizes and its surface is easy to regenerate. Electrochemical behavior of prepared electrodes was examined using typical model redox system potassium ferrocyanide in aqueous supporting electrolytes. The best ratio between signal and noise was attained at CFRE with a 2 mm diameter. Practical applicability of these methods was demonstrated on the determination of 5A6NQ at CFRE-2 mm in model samples of drinking and pond water. CFRE can serve as a good alternative to pencil electrodes or carbon paste electrodes especially in cathodic voltammetry.
A hybrid catalyst composed of silver (Ag) doped wire-like molybdenum carbide (MoxCy) with pure β-phase and carbon nanotubes (CNTs) was coated well on a carbon rod electrode for the hydrogen evolution reaction (HER). The effects of Ag loading amount and carbonization temperature on the crystal form of MoxCy were inv