Demonstrates a new reversible hydrogen electrode design for measuring equilibrium potentials of redox couples, suggesting improved safety and simplicity.
A novel reversible hydrogen electrode (RHE) is built and applied to the measurement of equilibrium potentials of several redox couples. Its operating principle is similar to that of a Normal Hydrogen Electrode (NHE) in that the potential for both is set by the H+/H2 couple. The proposed construction of this novel RHE is simpler and safer. Here, a Pt wire is placed inside a glass tube sealed at one end and filled with an H+ solution of unit activity. H2 gas is generated by electrolysis and becomes trapped at the top of the tube so that one section of the Pt wire is in contact with this gas and another section with an H+ solution of unit activity. This experimental setup avoids the requirement for bubbling H2 gas on platinized Pt foil at P = 1 atm as in a typical NHE.
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Buenda-Delgadillo et al. (2011) studied this question.
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