Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 9, Pages 6536-6541Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b01103
Keywords
amyloid peptide; beta-sheet; nanoparticles; oxygen reduction reaction; electrocatalyst
Funding
- Japan Society for the Promotion of Science (JSPS) [JP17H05142, JP16H02081]
- TIA Kakehashi
- University of Tsukuba Prestrategic initiative Ensemble of Light with Matters and Life
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The development of highly efficient catalysts for electrochemical oxygen reduction reactions (ORRs) is crucial for energy applications such as metal-air batteries and fuel cells. Here, we show an enhanced electrocatalytic activity of a new functional material composed of Pt nanoparticles (PtNPs) and self-assembled beta-sheet peptides (beta Ps). The PtNP/beta P hybrids, under an optimized assembly condition, display an ORR electrocatalytic activity that is higher than that of a commercially available benchmark Pt/C electrocatalyst in terms of the onset potential and reaction kinetics. Moreover, the PtNP/beta P hybrids show one order of magnitude higher ORR N-300 mass activity than previously reported peptide-based ORR electrocatalysts. The superb ORR activity with high durability is derived from the well-dispersed PtNPs on beta Ps, where 50% of the amine groups on the side chain bound with Pt to form Pt-N bonds that function as active sites for the catalytic reaction. This work opens new avenues for efficient ORR electrocatalysts using self-assembled peptides.
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