cross-posted from: https://sopuli.xyz/post/1726805
RMIT engineers say they've tripled the energy density of cheap, rechargeable, recyclable proton flow batteries, which can now challenge commercially available lithium-ion batteries for capacity with a specific energy density of 245 Wh/kg.
I'll try too.
Water can be split with electricity into hydrogen and oxygen atoms, which quickly combine into hydrogen and oxygen gas molecules.
This battery stores energy by using an acid environment to preserve the hydrogen atoms as single and electrically charged ions (weakly combining them with opposite-charge ions from an acid) and uses voltage to attract them into a carbon storage medium, where they de-ionize with the help of electrons from a wire and get deposited in porous carbon as single hydrogen atoms.
Meanwhile, oxygen is formed on the other electrode, far across a membrane. The oxygen cannot come across the membrane and combine with the hydrogen or carbon. Oxygen atoms react among themselves and form oxygen gas molecules.
When time comes to discharge, voltage across the terminals is removed and a load with resistance is installed. Hydrogen atoms stored in carbon give away their electrons, which flow across the wire (peforming work at the load) and ionize oxygen atoms on the other side. This creates a voltage gradient which attracts hydrogen ions to leave the carbon substrate and travel across the medium (acid conductor and membrane) to join with the oxygen ions and form water.