Electroactivity of nanoporous platinum depending on the porosity and potential for various electrode reactions

Yun Bin Cho, Ji Eon Kim, Chongmok Lee, Youngmi Lee

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Electroactivity of nanoporous Pt (npPt) depending on the pore characteristics was studied for various electrode reactions having a range of electrode reaction kinetics: ferrocene oxidation, l-ascorbic acid (AA) oxidation, oxygen reduction reaction (ORR), H2O2 reduction, and glucose oxidation. npPts with two different degrees of the porosities (npPt-1 and npPt-2) were electrodeposited on recessed Pt microdisk electrodes (100-μm diameter), employing deposition solutions in which the composition ratios of Pt precursor, Triton X-100, and lead acetate were varied. npPt-1 has smaller microscale pores than npPt-2. The electroactivities of npPts were analyzed using amperometric sensitivities at mass-transfer-controlled and kinetic-controlled potential regions. Both npPt-1 and npPt-2 increased the sensitivities for all the reactions but reversible ferrocene oxidation remarkably compared to bare Pt. In the kinetic-controlled region, npPt-1 showed more greatly enhanced sensitivity compared to npPt-2 due to the smaller pores exerting more efficient confinement of a reactant near the Pt surface. In mass-transfer controlled region, npPt-2 was beneficial for relatively fast reactions (AA oxidation, ORR); while npPt-1 was advantageous for slower reactions (H2O2 reduction, glucose oxidation). This suggests that the particle-to-particle distance of the npPt affects the electroactivity and an optimum degree of the porosity is different depending on the reaction kinetics.

Original languageEnglish
Pages (from-to)121-128
Number of pages8
JournalJournal of Electroanalytical Chemistry
StatePublished - 1 May 2016

Bibliographical note

Funding Information:
This work was financially supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning ( 2014R1A2A2A05003769 for YL) and ( 2014R1A2A2A01005479 for CL).

Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.


  • Electrocatalysis
  • Electrode reaction kinetics
  • Nanoporous structure
  • Platinum
  • Porosity


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