Effect of Sodium Chloride Solution Concentration on Hydrogen Gas Production in Water Electrolyzer Prototype

Energy is an essential component of human life because all human activities require energy. The current consumed energy comes from fossil fuels that are not renewable in a short time; therefore, they are decreasing over time. The current research shows the possibility of producing energy source from water in which Indonesia as an archipelago country has an abundant source of water. Therefore, Indonesia has a high possibility of developing renewable energy sourced from water. The process of getting hydrogen from water is called the electrolysis process of water. In this study, a water electrolyzer prototype was designed, and an experiment in producing hydrogen was conducted. The water used in this study is 6 liters with a variable that changes the concentration of sodium chloride solution (NaCl) starting from 10, 20, 30, 40, and 50%. The optimal production of hydrogen gas is at the concentration of 50% NaCl solution with the amount of gas produced at 11.29 liters and the mol percent of hydrogen in the product which is 78.45%.