Ultra-fine activated carbon bonded ( with a slow -curing epoxy resin) to grafoil electrodes. Dried 24 hours at 20 deg C. An open system with the duo-electrodes in 25% (m/v) sodium sulfate electrolyte with polyurethane separator. rapid charge over 1.7 V and runs a small DC motor. promising. Re-charge demonstrated a strong supercap. Specs to be collected and presented.
Lead batteries continue to be important. Here, I coated a thin strip of fresh lead with a paste of red lead ( PbO2). I use sodium sulfate/ water and lead salt as the paste. I dry at 100 deg c for 30 minutes. I place the electrode in a small 3.5" plastic device with unpainted lead as the other electrode. Seperated by the polyurethane material. Close contact but no short. Raid charge to 2.2V. Cutoff at 1.75 V for now. Runs small DC motor. 25% aq. H2SO4 as electrolyte. Safe system for evaluating electrodes, separators and electrolytes. I work with undergrads and want safety and health first. I will collect data and report here. I will create such cells with Ni/Zn, the Pb/Pb, and duo-grafoil siupercaps and ultra-cells.
I will also post images of the excellent "ZB Tech" devices I use in battery/ supercap cycles studies. I am lucky to have six 96) in my lab for my students and I.