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standard hydrogen electrode

For solutions in protic solvents, the universal reference electrode for which, under standard conditions, the standard electrode potential (H+ / H2) is zero at all temperatures. The absolute electrode potential of the hydrogen electrode under standard conditions can be expressed in terms of thermodynamic quantities by applying a suitable Born–Haber cycle, thus:
E ° H + / H 2 abs = Δ at G ° + Δ ion G ° + α H + o,S F
where Δ at G ° and Δ ion G ° are the atomization and ionization Gibbs energies of H2, α H + o,S is the real potential of H2 in solvent S and F is the Faraday constant. The recommended absolute electrode potential of the hydrogen electrode is:
E ° H + / H 2 H 2 O abs = ( 4.44 ± 0.02 ) V at 298.15 K
Source:
PAC, 1986, 58, 955 (The absolute electrode potential: an explanatory note (Recommendations 1986)) on page 957
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.S05917.
Original PDF version: http://www.iupac.org/goldbook/S05917.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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