Bring me a shrubbery: How tiny trees might fit in the biofuel future

Rubber that can make and store power from light and vibration

Researchers “heal” destructive dendrite growth in lithium-metal batteries

Dendrites—branching structures that look like tree limbs—are fun to draw and good on neurons, but they’re generally best avoided in lithium-ion batteries. As ions are exchanged between the anode and cathode over several charge and discharge cycles, lithium electrodes will sometimes grow dendrites that can expand through the electrolyte that separates the anode and cathode. These dendrites can reduce the battery’s capacity, shorten the life of the battery, or even start fires as the dendrites heat up.

Origami-Folded Hydrogel Paper Instantly Generates 110 Volts of Electricity

Rows of small hydrogel dots are packed with positively and negatively charged ions that combine together to mimic an electric eel’s cellular structure. Printing and stacking these hydrogels produces the highest amount of voltage, while a connection to a larger contact area produces the highest current. Scientists are hoping that this system could potentially lead to a device that generates power from inside of the human body.