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Electroactivity of nanoporous platinum depending on the porosity and potential for various electrode reactions
- Electroactivity of nanoporous platinum depending on the porosity and potential for various electrode reactions
- Cho, Yun-Bin; Kim, Ji Eon; Lee, Chongmok; Lee, Youngmi
- Ewha Authors
- 이종목; 이영미
- SCOPUS Author ID
- 이종목; 이영미
- Issue Date
- Journal Title
- JOURNAL OF ELECTROANALYTICAL CHEMISTRY
- 1572-6657; 1873-2569
- vol. 768, pp. 121 - 128
- Platinum; Nanoporous structure; Porosity; Electrode reaction kinetics; Electrocatalysis
- ELSEVIER SCIENCE SA
- SCI; SCIE; SCOPUS
- 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-mu m 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. (C) 2016 Elsevier B.V. All rights reserved.
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