The relationship between the time (hours, days) of a graphene battery in a saturated copper chloride solution and the appearance voltage.
These include LEDs connected to the graphene ribbon structure. They just put it in the copper chloride solution and observe it. The LED light is on. In fact, they need six graphene circuits connected in series so that the 2V voltage required to make the LED glow can be used to take this picture.
What happens here is that copper ions have two layers of positive charges, which pass through the solution at a speed of about 300 meters per second because of the thermal energy of the solution at room temperature. When the ions violently impact the graphene ribbon, the impact energy that appears is sufficient to separate the unplaced electrons from the graphene. There are two options for electrons: one is to leave the graphene ribbon and combine with copper ions, and the other is to pass through the graphene and enter the circuit.
Initially, the electrons moving in graphene move faster than those in the solution, so the electrons will naturally choose to pass through the circuit. This is what lights up the LED lights. The released electrons are more likely to pass through the graphene surface instead of entering the electrolyte. This is how the voltage is applied,
Therefore, the energy generated by the device comes from the heat of the surrounding environment. They can improve the current by heating the solution, or use ultrasound to accelerate the copper ions. Relying on the surrounding heat alone, they can keep the graphene battery running for 20 days. However, there is an important question mark here. Another hypothesis is that a certain chemical reaction will produce electric current, just like a normal battery.
However, this was ruled out because of several control experiments. However, these are in some supplementary materials and do not appear to appear on the arXiv website. They want to make it public before anyone else makes a stern statement. In terms of physical value, this seems to be a very important role. Others also have overcurrent in graphene, but just let water pass, so it is not surprising that moving ions also have overcurrent. This battery promises to use a clean, green battery, powered only by ambient temperature.