Electrode — Definition, Formula, Properties & Uses | AllChemicals | AllChemicals

Also Known As	Electrode, Half-cell, Anode, Cathode

What is Electrode?

An electrical conductor through which current enters or leaves an electrolytic medium. The anode is the electrode at which oxidation occurs, while the cathode is where reduction occurs. Electrodes can be inert (platinum, graphite) or active (participating in the reaction).

Properties & Characteristics

Two types: anode (oxidation, positive in electrolytic cell, negative in galvanic) and cathode (reduction, negative in electrolytic, positive in galvanic). Electrode potential measured vs SHE (E° = 0.000 V). Inert electrodes: platinum, graphite (do not participate in reaction). Active electrodes: copper, zinc (dissolve or deposit). Overpotential is additional voltage needed beyond thermodynamic minimum.

Uses & Applications

Batteries (zinc anode, MnO₂ cathode in dry cell). Fuel cells. Electroplating anodes and cathodes. Electrolytic refining (copper anode dissolves, pure copper deposits at cathode). Aluminum smelting (carbon anodes consumed by O₂). Biosensors. Reference electrodes (Ag/AgCl, saturated calomel electrode) for pH and potentiometric measurements.

Safety Information

Electrodes in electrolytic cells carry high current — electrical hazard. Carbon anodes in aluminum smelting react with O₂ to produce CO and CO₂. Platinum electrodes in H₂SO₄ generate H₂ (flammable) and O₂ (supports combustion) simultaneously — ensure ventilation. Mercury electrodes (historical chloralkali industry) are now banned due to mercury contamination hazards.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Electrode

Index All "E" terms

Synonyms Electrode, Half-cell, Anode, Cathode

Frequently Asked Questions

What is Electrode?

An electrical conductor through which current enters or leaves an electrolytic medium. The anode is the electrode at which oxidation occurs, while the cathode is where reduction occurs. Electrodes can be inert (platinum, graphite) or active (participating in the reaction).

What is Electrode used for?

Is Electrode hazardous?

More "E" Terms

Effective Collisions Effective Collisions E ≥ Ea (activation energy required) Effective Molality m_eff = i × m (van't Hoff factor) Effective Nuclear Charge Z_eff = Z − σ (Slater's rules) Efflorescence Hydrated salt losing water in air: M·nH₂O(s) → M·(n-x)H₂O(s) + xH₂O(g) Einsteinium Es Electrical Conductivity κ = 1/ρ; Λm = κ/c Electrochemical Cell Galvanic cell: ΔG = −nFE_cell; Electrolytic cell: ΔG = +nFE_applied Electrochemical Series Arranged by E° (standard reduction potential); SHE: E° = 0.00 V Electrochemistry E° cell = E° cathode − E° anode | ΔG° = −nFE° Electrochemistry Electrode Potential E = E° − (RT/nF)ln Q

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