The device that converts electrical energy into chemical energy is called an electrolyzer.

Here's how it works:

* Electrolysis: Electrolyzers use an electric current to drive a chemical reaction that splits water molecules (H2O) into hydrogen (H2) and oxygen (O2) gas.

* Chemical Energy Storage: The produced hydrogen gas can be stored and later used as a fuel source, releasing its chemical energy through combustion or in fuel cells.

Example:

The most common type of electrolyzer uses an electric current to split water into hydrogen and oxygen:

2H2O(l) → 2H2(g) + O2(g)

This process stores electrical energy in the form of chemical energy in the hydrogen gas.