I have porous electrodes consisted of n-type nanomaterial. I was wondering if we could have effect of particles sizes at flatband potential obtained by Mott–Schottky plots? Does anyone could share some information about it?
I'm not sure what you mean by "effect of particles sizes at flatband potential" but in many cases it is possible to use Mott-Schottky-plots to determine flat-band potentials for porous electrodes.
Most likely, your impedance spectra will have to be analyzed using a constant phase element rather than a capacitor to account for the uneven surface, see for example Harrington, S. P., & Devine, T. M. (2008). Analysis of Electrodes Displaying Frequency Dispersion in Mott-Schottky Tests. Journal of The Electrochemical Society, 155(8), C381. doi:10.1149/1.2929819. Also you should make sure you do not have any pinholes in your electrode.
In case the Mott-Schottky plots do not give satisfactory results, there are also other methods to determine flat-band potentials, see Beranek, R. (2011). (Photo)electrochemical Methods for the Determination of the Band Edge Positions of \cf{TiO2}-Based Nanomaterials. Advances in Physical Chemistry, 2011(Iv), 1–20. doi:10.1155/2011/786759.
I'm not sure what you mean by "effect of particles sizes at flatband potential" but in many cases it is possible to use Mott-Schottky-plots to determine flat-band potentials for porous electrodes.
Most likely, your impedance spectra will have to be analyzed using a constant phase element rather than a capacitor to account for the uneven surface, see for example Harrington, S. P., & Devine, T. M. (2008). Analysis of Electrodes Displaying Frequency Dispersion in Mott-Schottky Tests. Journal of The Electrochemical Society, 155(8), C381. doi:10.1149/1.2929819. Also you should make sure you do not have any pinholes in your electrode.
In case the Mott-Schottky plots do not give satisfactory results, there are also other methods to determine flat-band potentials, see Beranek, R. (2011). (Photo)electrochemical Methods for the Determination of the Band Edge Positions of \cf{TiO2}-Based Nanomaterials. Advances in Physical Chemistry, 2011(Iv), 1–20. doi:10.1155/2011/786759.
You can use the Mott-Schottky plots to estimate the flat band of your nano-porous electrode. See the following article: "Mott-Schottky Analysis of Nanoporous Semiconductor Electrodes in Dielectric State Deposited on SnO2F
Conducting Substrates"Journal of The Electrochemical Society, 150 ~6! E293-E298 ~2003!
And to confirm the flat band you may use other techniques like Plotting Voc versus light intensity, giving more negative potentials and observing the photocurrent onset etc. Good luck!
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