AI Article Synopsis
- * This study explores a method to enhance catalytic activity by depositing cobalt oxyhydroxide as nano-islands onto Pt surfaces and examines the underlying mechanism using density functional theory (DFT).
- * Results show that this new structure significantly boosts electrocatalytic activity, making it 3.6 times more effective than traditional Pt/C catalysts, due to alterations in oxygen atom interactions through the modifications.
Article Abstract
With the rapid development of fuel cell technology, the low reduction rate of oxygen on Pt-based cathodes is generally considered the main obstacle. Pt/transition metal alloys (Pt-Ms) or Pt/transition metal oxides (Pt-MO ) can be formed by doping transition metal atoms into the lattice of the Pt layer or depositing onto the surface of the Pt layer to intensify the catalytic activity of the electrodes. In this work, a stepwise solution chemical reduction method for high dispersion of cobalt oxyhydroxide (-OCoOH) deposited onto the facet of Pt as nano-islands and the mechanism of promoting the oxygen reduction reaction (ORR) at the cathode have been investigated by density functional theory (DFT) calculation. As a result, the electrocatalytic activity of Pt with nano-island -OCoOH structure was 3.6 times that of the Pt/C catalyst, which indicated that promoting the desorption of the first O atom and weakening the adsorption capacity of the interfacial junction Pt for the second O atom from adsorbed oxygen attributed to the migration of d-band center in Pt and the existence of the Co hydroxyl group.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9058475 | PMC |
| http://dx.doi.org/10.1039/d0ra08645b | DOI Listing |
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