单词	electrode potential
释义	electrode potential The potential difference produced between the electrode and the solution in a half cell. It is not possible to measure this directly since any measurement involves completing the circuit with the electrolyte, thereby introducing another half cell. Standard electrode potentialsE; are defined by measuring the potential relative to a standard hydrogen half cell using 1.0 molar solution at 25°C. The convention is to designate the cell so that the oxidized form is written first. For example, Pt(s) | H2(g)H+(aq) | Zn2+(aq) | Zn(s) The e.m.f. of this cell is -0.76 volt (i.e. the zinc electrode is negative). Thus the standard electrode potential of the Zn2+ | Zn half cell is -0.76 V. Electrode potentials are also called reduction potentials . See also electromotive series
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