Abstract
The electrocatalytic activity of commercial silver nanowires (AgNWs) with different diameters (35, 90, and 120 nm) was investigated towards the oxygen reduction reaction (ORR) in 0.1 M KOH solution. The rotating disc electrode (RDE) data analysis revealed that the ORR onset potential and half-wave potential shift positively for AgNWs as compared to a polycrystalline Ag electrode. The enhanced ORR performance of AgNWs with a diameter of 35 nm was attributed to the elongated porous structure of the catalyst material, which facilitated the mass transport in the catalyst layer. The Koutecky-Levich analysis was used to determine the kinetic parameters of O2 reduction and to confirm that the ORR proceeds via 4-electron pathway on AgNW-modified electrodes. Stability tests showed that 35 nm thick AgNWs had high stability during long-term potential cycling. Based on the obtained results, the AgNWs have great potential as efficient catalysts for alkaline membrane fuel cell technologies.
Original language | English |
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Pages (from-to) | 4364-4371 |
Number of pages | 8 |
Journal | ChemCatChem |
Volume | 13 |
Issue number | 20 |
DOIs | |
State | Published - Oct 19 2021 |
Externally published | Yes |
Keywords
- Ag nanowires
- Catalyst
- Electrocatalysis
- Oxygen reduction
- Peroxide