Electrochemistry is a kind of chemistry that studies chemical reactions that use or make electricity : Reactions like this happen at electrodes which are made from something that conducts electricity , and put in an electrolyte . An electrolyte is a solution that has ions in it . Electrochemistry is a branch of chemistry that studies chemical reactions which take place in a solution at the interface of an electron conductor ( a metal or a semiconductor ) and an ionic conductor ( the electrolyte ) , and which involve electron transfer between the electrode and the electrolyte or species in solution .