Jump to main content
Jump to site search

Issue 37, 2017
Previous Article Next Article

Electrochemical estimation of the active site density on metal-free nitrogen-doped carbon using catechol as an adsorbate

Author affiliations

Abstract

Carbon is heat-treated with a nitrogen-containing precursor (ammonia) to obtain nitrogen-doped carbon and the composition is estimated using CHN and XPS analysis. The active site density of the carbon and nitrogen-doped carbon is quantified using 1,2-dihydroxybenzene (catechol) molecules as an adsorbate in phosphate buffer (pH 7) solution. The features of the voltammograms of the catechol-adsorbed high surface area carbon and nitrogen-doped carbon are similar to that of the polished nitrogen-grafted glassy carbon electrode (GCE) reported in the literature. At the same time, the polished GCE does not show any well-defined catechol adsorption features. It is found that the adsorption charge (obtained by integrating the peak area, after subtracting the background) is in the order of N/C 900 > N/C 1000 > N/C 800 > N/C 700 > C. A similar trend is observed in their oxygen reduction reaction (ORR) activity in 0.1 M KOH. Moreover, the turnover frequency (ToF) of the catalysts is calculated and it is comparable to that reported in the literature using other methods for non-precious catalysts. Therefore, the adsorption charge can be correlated with the active site density of the carbon and nitrogen-doped carbon samples.

Graphical abstract: Electrochemical estimation of the active site density on metal-free nitrogen-doped carbon using catechol as an adsorbate

Back to tab navigation

Supplementary files

Publication details

The article was received on 26 Jun 2017, accepted on 31 Aug 2017 and first published on 31 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP04285J
Citation: Phys. Chem. Chem. Phys., 2017,19, 25414-25422
  •   Request permissions

    Electrochemical estimation of the active site density on metal-free nitrogen-doped carbon using catechol as an adsorbate

    A. Chakraborty, R. Devivaraprasad, B. Bera and M. Neergat, Phys. Chem. Chem. Phys., 2017, 19, 25414
    DOI: 10.1039/C7CP04285J

Search articles by author

Spotlight

Advertisements