Exchange Current Density Significance? Quantitative measure of amount of electron transfer activity at equilibrium ho large much simultaneous ox/red electron transfer(ET → inherently fast E「( kinetics) Io small little simultaneous ox/red electron transfer(E o sluggish ET reaction( kinetics)Exchange Current Density Significance? Quantitative measure of amount of electron transfer activity at equilibrium Io large  much simultaneous ox/red electron transfer (ET)  inherently fast ET (kinetics) Io small  little simultaneous ox/red electron transfer (ET)  sluggish ET reaction (kinetics)