Primary and Solvent Isotope Effects in the Anodic Evolution of Oxygen

Abstract

This equation is plotted for x = 0 in Fig. 8 and is plotted as a function of x for different values of t/T in Fig. 9.The above examples were intended to illustrate the general procedure for employing the lumped parameter models in the computation of concentration transient responses. Even though we have restricted these examples to a constant current excitation, other types of current excitations can readily be considered in a similar manner. In particular, for other excitations the lumped parameter approach becomes even more attractive. This follows because the solution of the diffusion equation, Eq.[13], is practically intractable except for very few excitations, such as the constant current excitation. ConclusionsThe incremental model has been shown to be a convenient vehicle with which to study electrical conduction phenomena in the electrolyte of a reversible transference cell. The linear relationship between concentration and current, for the approximations set forth, suggests a tangible means for describing a distributed system with a circuit analog. This follows because the same system can be analyzed for different excitations without recourse to the exact partial differential equations which are, in general, more difficult to solve than differential-difference equations. Even though the lumped parameter model has its principal limitation in predicting rapid transients, such as the initial portion of the concentration transient for a constant current excitation, its iterative structure provides a convenient means for adding more increments to the model to improve the accuracy. For many applications, where the over-all transient is to be investigated, a two-increment model for the half-cell should be adequate.The possibility of extending and applying the lumped parameter model to other electrolytic systems should pose some challenging and interesting problems. ABSTRACTThe use of hydrogen isotopes in studying the oxygen evolution reaction (o.e.r.) is discussed. It is shown that along with other experimental data such as pI-I studies, Tafel behavior, etc., the H/D-isotope effects can be used as additional criteria for the elucidation of reaction mechanisms. Normal isotope ) unless CC License in place (see abstract).