Reformation of hydrogen electrolyser in power plant for twofold generation hydrogen & ozone

Hydrogen production via electrolysis of water from alkaline aqueous electrolytes is a valid typical technology [۱,۲,۳]. Electrochemical hydrogen compression is seen as a promising alternative to mechanical compression in the context of power-to gas plants. It can be carried out either as direct co-compression in a water electrolyser or via a separate electrochemical hydrogen compressor . The Water electrolyser uses electrical energy to split water into oxygen at the anode and hydrogen at the cathode[۲,۴]. Hydrogen indirectly cooled stator of generators in the thermal power plant[۳]. in addition, most electrochemically generated hydrogen is produced using alkaline electrolysers in a wide range of production processes, including the food industry for increasing saturation in oils and fats, their melting points and resistance to oxidation. and the nuclear industry requires H۲ for removing O۲ as it can cause stress corrosion cracking and power stations use H۲ as a coolant for its generators due it its high thermal conductivity. Oxygen, normally generate a by-product of electrolysis[۴]. The generic reaction which takes place in a water electrolyser is: ( H۲O→ ½ O۲ + H۲ )But by change in anode of electrolyser we can generate ozone instead of oxygen , Ozone is an environmentally-friendly oxidant that is widely used for industrial applications, such as water disinfection, air purification, and medical use [۵].commercially available technology for ozone generation is based on electrochemistry (water electrolysis: ۳H۲O→O۳ + ۶H+ + ۶e–) [۶]. This approach can be achieved by suitable choice of the anode material to have a high over potential for OER and available couple with cathode to hydrogen generation. In addition to, the material electrode in anode should have good conductance, high durability under drastic operating conditions, and particularly good electrocatalytic activity for ozone production. Different electrodes contain β-PbO۲, Pt, Pt composites, boron-doped diamond, TiO۲ thin films on Si/TiOx/Pt substrate, and Ti/Ni-Sb-SnO۲ catalysts are among the materials that have been used for EOP.[۵-۹] In this work, a high-performance porous titanium oxide electrode (Ti/TiO۲/Ni-Sb-SnO۲) has been developed for electrochemical production of ozone. The Ti/TiO۲ electrode was prepared using anodizing method at high voltage for forming a layer of porous TiO۲ on the surface of Ti mesh, then followed by depositing a layer of Ni-Sb-SnO۲ under deep eutectic solvent on the Ti/TiO۲ surface. The deep eutectic solvent was used for electrodepositing, because its great effect on electrode performance. Ozone was electro generated from tap water or alkaline electrolyte on Ti/TiO۲/ Ni-Sb-SnO۲ electrodes at different operating conditions. Higher efficiency of O۳ generation was obtained at ۳ V in alkaline electrolyte (Fig. ۱).other electrode only with acidic electrolyte exponent to ozone generation but These electrodes were used in electrochemical ozone production (EOP) carried out during the electrolysis of electrolyte-free water or alkaline electrolyte in order to obtain an environmentally friendly technology for water treatment .