Nanoparticle modified electrodes can show an apparent increase in electrode kinetics due solely to altered surface geometry: The effective electrochemical rate constant for non-flat and non-uniform electrode surfaces

Planar diffusion to macro disc electrodes—what electrode size is required for the Cottrell and Randles-Sevcik equations to apply quantitatively?

“…(1) and (2) are the need for tight thermostating, application of the appropriate potential range such that the voltage seen is not reversed prematurely relative to a cyclic voltammetry peak [13], the avoidance of using second or later scan data, the avoidance of natural convection [21,22] the recognition that the use of a digital potentiostat can broaden voltammetric measurements [23] and the need to ensure that the electrode is flat and neither rough nor porous [24,25]. However, one further very simple consideration has to be addressed, namely how large does the electrode have to be in order to quantitatively comply with Eqs.…”

Voltammetric Separation and Determination of Glutathione and L‐tyrosine with Chlorogenic Acid as an Electrocatalytic Mediator

“…It could be clearly seen that both cathodic and anodic peak currents were increased about 4 times at AB‐CS/GCE than that obtained at GCE with the peak to peak separation (▵Ep) decreased obviously. The most likely reason for the difference in the two voltammograms (curve a and b) was a difference in the porosity of the two surfaces leading to a change of mass transport ‐ semi‐infinite diffusion to thin layer diffusion , .…”

Mono and bi-metallic electrocatalysts of Pt and Ag for oxygen reduction reaction synthesized by sonication

“…The specific activities at 0.8 V/NHE obtained for Pt-Ag/C (0.025 mA cm −2 real ) was higher when compared to Pt/C (0.002 mA cm − 2 real ) and Pt Etek (0.004 mA cm − 2 real ). The mass activities order for the synthesized materials versus the commercial sample was Pt-Ag/C (0.097 mA μg −1 ) N Pt Etek (0.063 mA μg −1 ) N Pt/C (0.002 mA μg −1 ), due to probably changes in the geometry and surfaces coverage caused by the presence of Ag in the agglomerate form and particle size [30]. It's important considering that geometry and distribution of the catalytic surface can be produce an apparent catalytic effect and not necessarily related to changes in kinetics at the nanoscale, for example by altered structural or electronic properties surfaces covered [31].…”