This sealed electrolyte cell is designed for three-electrode electrochemical experiments requiring a controlled atmosphere or gas exchange. It features a glass vessel with a polytetrafluoroethylene cover that seals the system, minimizing air contamination during measurements. The cover is equipped with three 6 mm electrode holes by default, with customizable dimensions and hole count available upon request, allowing adaptation to specific electrode geometries. Integrated inlet and outlet tubes facilitate gas purging or connection to auxiliary equipment such as RuJin capillaries. Available in capacities from 50 to 250 mL, this cell suits applications in energy materials and analytical electrochemistry where stability and reproducibility are essential. Please note that the cell is supplied without electrodes, and a vent hole can be added if required.