Electrochemistry and Energy storage devices

Electrochemistry

The study of electricity and how it relates to chemical reactions.

Reduction

Gain of electrons

Oxidation

loss of electrons

Redox reactions

Involves simultaneous reduction and oxidation half reactions

Electrolytes

Substances that when dissolved give solutions that conduct electricity, most are ionic substances

Electrochemical cells

A device capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions

Generate an electric current

Voltaic cells or galvanic cells

Cause a chemical reaction

Electrolytic cells

Galvanic cells

Electrochemical cells that derive electrical energy from spontaneous redox reactions taking place within the cells

Daniel cells

Has a zinc half-cell containing a solution of ZnSO4 and a copper cell containing a solution of copper sulphate

Half reactions

metals, ions and gases

Standard electrode potential

Under standard conditions the half-cell potential

Electrochemical series

List of half reactions ordered in series of E values

Highly positive E

Good oxidising agent - donate

E cell

E cathode - E anode

Non-standard conditions

products over reactants