The diffusion-limited current density (Jlim) is proportional to the diffusion coefficient of I3-, D according to equation below,
D={(L)/(2nFC)}Jlim
where D is the diffusion coefficient of the I3-, L is the distance between the electrodes, C is the triiodide concentration of about 2.165×10-4 mol cm-3 and the rest retain their usual significance.
Like in the same manner, I want to calculate the D in QDSSC. So what is the value of Concentration (C) in QDSSC. In QDSSC I used polysulfide electrolyte (1 M Na2S, 2 M S and 0.2 M KCl in methanol and water at a ratio of 7:3). Please tell me the C value of polysulfide?
Check this paper, they have calculated ''D''.
http://pubs.acs.org/doi/pdfplus/10.1021/jp4110773
Hai Sujoy Sarkar. Thank you for your reply. The authors in the mentioned paper calculated Diffusion coefficient from multiplication of (diffusion length)2 with electron life time. But I need Dn using limiting current density (Jlim) from Tafel. I have all the values instead of concentration (C) of Sn2- ions.
Bull. Korean Chem. Soc. 2012, Vol. 33, No. 2
Dynamic Response of Charge Transfer and Recombination at Various Electrodes
in Dye-sensitized Solar Cells Investigated Using Intensity Modulated Photocurrent
and Photovoltage Spectroscopy
In this paper, IMPS and IMVS provided transit time (τn), lifetime (τr), and diffusion coefficient (Dn). Maybe you can find some information from this paper.
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