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Non-platinum oxygen reduction electrocatalysts based on carbon-supported metal-polythiophene composites
- Non-platinum oxygen reduction electrocatalysts based on carbon-supported metal-polythiophene composites
- Han, Su Jung; Jung, Hyun Jung; Shim, Jun Ho; Kim, Hyun-Chul; Sung, Shi-Joon; Yoo, Bong; Lee, Dong Ha; Lee, Chongmok; Lee, Youngmi
- DGIST Authors
- Kim, Hyun-Chul; Sung, Shi-Joon; Lee, Dong Ha
- Issue Date
- Journal of Electroanalytical Chemistry, 655(1), 39-44
- Article Type
- Acidic Conditions; Catalyst Activity; Catalytic Activity; Chemical Polymerization; Composite Materials; Electrocatalyst; Electrocatalysts; Electrocatalytic Activity; Electrolysis; Electrolytic Reduction; Electron Transfer; Exchange Current Densities; Iridium; Metal-Polymer Composite; Metals; N Value; Non-Platinum; Number of Electrons; Onset Potential; Oxygen; Oxygen Reduction; Oxygen Reduction Reaction; Palladium; Platinum; Poly-Thiophene; Polymers; Polythiophene; Rotating Disk Electrode Voltammetry; Rotating Disks; Superior Catalysts; Supported Metals; Tafel Plots; Tin
- A series of carbon-supported metal-polythiophene composite (M-PTh/C) electrocatalysts are synthesized based on seven different non-Pt metals (M = Ir, Ru, Pd, Co, Fe, Ni, Sn) using chemical polymerization method. The electrocatalytic activity toward the oxygen reduction reaction (ORR) is characterized in acidic condition using rotating disk electrode voltammetry. Ir-, Ru-, and Pd-PTh/C show far more positive (ca. 700 mV) ORR onset potentials than Co-, Fe-, Ni-, and Sn-PTh/C. Further studies on the ORR kinetics are carried out for the three superior catalysts, Ir-, Ru-, Pd-PTh/C, using Koutecky-Levich and Tafel plots. The number of electrons (n) transferred in the ORR is ∼4 for these three catalysts, suggesting 4-electron transfer ORR is dominant. Considering all the obtained factors (such as the onset potential, n value, and exchange current density), Ir- and Ru-PTh/C catalysts are concluded to have relatively excellent ORR catalytic activity. © 2011 Elsevier B.V. All rights reserved.
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