Planar supercapacitors are widely used in various electronic devices due to their high energy storage capacity and small size. The performance of the electrodes in planar supercapacitors plays a crucial role in determining their overall performance. This study focuses on investigating the performance of electrodes for planar supercapacitors with different substrates using the screen printing technique. With different flexible electrode substrates and Carbon-based material experimental, the electrode design, capacitor value and energy density showed certain rules for future application. The goal is to understand the influence of substrate materials on the electrical properties of the electrodes and optimize their performance.