Study on optimum selection of diaphragm materials for alkaline electyolytic water
As a clean and efficient way to produce hydrogen energy,alkaline electrolytic water technology is relatively mature and widely used.The diaphragm is an important part of the electrolytic cell and plays a key role in the electrolysis performance of the cell.Based on the purpose of reducing the electrolysis voltage of hydrogen production by electrolytic water,by analyzing and testing the structural characteristics and conductivity of different types of diaphragm,combined with the comprehensive evaluation of their electrolytic performance in electrolytic cell,the relationship between the structure and performance of the diaphragm was explored,and the diaphragm material suitable for alkaline electrolyzed water was optimized.Polymer diaphragms were screened according to the indicators of diaphragm performance required for alkaline water electrolysis,such as diaphragm conductivity,porosity,alkali resistance,bubble permeability,wettability,mechanical strength and thermal stability.Several domestic and imported commercial polymer porous diaphragms of different specifications and models were selected.Through a comprehensive comparison of several domestic and imported commercial polymer diaphragms with different specifications and models,it is found that the imported AGFA-Ⅳ diaphragm have the best performance,with a porosity of 60％±10％and a diaphragms conductivity of 51.7 cm-1·Ω-1.An electrolytic cell was assembled and the electrolytic performance of the AGFA-Ⅳ diaphragm was tested on this basis.The results show that the electrolytic cell based on the imported AGFA-Ⅳ diaphragm has the lowest water electrolysis voltage during the electrolysis test,which is 1.841 V at the 0.4 A/cm2.Therefore,it is determined that the imported AGFA-Ⅳ diaphragm is the optimal material for the system.The research helps to better understand the basic knowledge of the diaphragm in the process of alkaline electrolytic cell electrolysis,and plays a certain role in the design and construction of high-performance diaphragm for alkaline electrolytic water.
alkaline electrolytic waterelectrolytic celldiaphragmconductivityelectrolytic voltage
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