Taking the example of Au/Pd metal, the ECSA is calculated from the Au/Pd-reduction curve carried out in 0.1M HCLO4/H2SO4 as per many reports in the literature (ref. below). When the ECSA is divided to the current obtained from the alcohol oxidation/H+ reduction by the modified electrode, the oxidation current becomes high (with a low ECSA number) and the oxidation current becomes low (when the ECSA is high). So, in this process how to infer which is a better electrocatalyst?
Eg. In this paper the ECSA is very low (0.0016 cc) with a high current density for hydrogen reduction.
Thanks Lee Feng for the reply,
Considering the Voltammetric behavior to be reproducible, Can we say a metal nanocomposite with a very low ECSA as a better catalyst, since, after dividing a low number of ECSA the current density of H+ reduction becomes very high.
From its electroactive behavior which will reflect upon its electrocatalytic activity. Surface area to volume ratio, morphological features, conductivity etc will also contribute to the catalytic activity under the influence of electric current.
As for the current of the voltammetric curves, the mass transfer on the electrode interferce may be important as well. The surface topography was suggested to be evaluated. We have observed the similar phenomenon in our recent publication (DOI:10.1109/JSEN.2021.3122326).
In this paper, the graphene modified electrode exhibts larger surface area than the electrode with gold nanoparticles. While the electrode with gold nanoparticles as the outermost layer shows better catalytic activity and selectivity.
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