Study Of The Electrochemical Properties Of Gas-absorbing Bismuth Electrodes Of Electrolysis For The Production Of High-pressure Hydrogen And Oxygen

Hydrogen is hardly found in the pure form in nature and must be extracted from other compounds by various chemical methods.The multiple ways of producing hydrogen are one of the main advantages of hydrogen energy,because it increases energy security and reduces dependence on certain types of raw materials.The electrolysis of water differs from the simplicity of other technical solutions,the availability of water as a raw material,the ease of maintenance of facilities,and the high reliability of operations to obtain hydrogen.This allows us to successfully combine this approach with the use of renewable energy sources?solar energy,wind energy,etc.?.The main drawback of the electrochemical method for producing hydrogen is its high energy intensity.Therefore,it is promising for hydrogen energy and related to the development of electrochemical techniques that generate hydrogen from water at the lowest energy cost.The principle of cyclic electrolysis at the high pressure of the next step in the production of hydrogen is a good idea for the efficient use of excess energy from renewable energy sources.This method involves the use of a suction electrode with a very high capacity.1.The active substance Fe-Bi₂O₃-C?material Fe-Bi₂O₃,SP-carbon,K2CO3,PTFE,80:10:5:5 by weight mixture?is made to produce gas absorption on a 3D foamed nickel substrate.electrode.The capacitance of the electrode active material reached 1206 F·g-1,and the cycle resistance of the Fe-Bi₂O₃-C/NF electrode decreased by 27% after 200 cycles.Further determining the electrochemical properties,and electrode compositions studied crystals.This simple and inexpensive preparation of the electrode,but the charge-discharge cycle of the low,low volume capacity,calculated,which limits their use for manufacture of small electrolytic cell.2.In this case,the principle of cyclic electrolysis of overall water splitting to generation high-pressure hydrogen in one step is considered,that may become a good idea for efficient use of excess electricity from renewable energy sources.This approach involves the use gas-absorbing electrode with very high capacitance.Herein,to create a gas-absorbing electrode,on 3D Ni foam was coated active paste?mixture of Bi-Bi₂O₃ material,SP carbon,K2CO3,PTFE as 80:10:5:5 % wt.?,where Bi-Bi₂O₃ material was synthesized by recovery of bismuth cations in an aqueous solution.The electrochemical performance of the Bi-Bi₂O₃-C/NF electrode was investigated by cyclic voltammogram?CV?and galvanostatic charge-discharge?GCD?in 6 M KOH electrolyte solution.The crystal composition and morphology of the Bi-Bi₂O₃-C/NF electrode before and after of electrochemical tests was characterized using powder X-ray diffraction?XRD?and scanning electron microscopy?SEM?.The specific capacitance of the electrode material is reaches 1188 F g-1?for areal capacitance 88 F·cm-2?at 5 m A ×-1 cmand slightly decreases within range with 5 to 20 m A·cm-1?12% less?.The cyclic life of the Bi-Bi₂O₃-C/NF electrode is also measured and the capacitance only declines 5 % after 200 cycles.Calculations showed that Bi-Bi₂O₃-C/NF electrode has a perspective for application in the technology of cyclical high-pressure hydrogen generation,and optimal modes will correspond to current density from 200 to 400 A·m-2.