Interconnected Pt-nanodendrite/DNA/reduced-graphene-oxide hybrid showing remarkable oxygen reduction activity and stability
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- Interconnected Pt-nanodendrite/DNA/reduced-graphene-oxide hybrid showing remarkable oxygen reduction activity and stability
- Tiwari, Jitendra N.; Kemp, Kingsley Christian; Nath, Krishna; Tiwari, Rajanish N.; Nam, Hong-Gil; Kim, Kwang S.
- catalytic activity; DNA; fuel cells; oxygen reduction reaction; Pt nanodendrites
- Issue Date
- AMER CHEMICAL SOC
- ACS NANO, v.7, no.10, pp.9223 - 9231
- Controlling the morphology and size of platinum nanodendrites (PtDs) is a key factor in improving their
catalytic activity and stability. Here, we report the synthesis of PtDs on genomic-double-stranded-DNA/reduced-grapheneoxide
(gdsDNA/rGO) by the NaBH4 reduction of H2PtCl6 in the presence of plant gdsDNA. Compared to industrially adopted
catalysts (i.e., state-of-the-art Pt/C catalyst, Pt/rGO, Pt3Co, etc.), the as-synthesized PtDs/gdsDNA/rGO hybrid displays very
high oxygen reduction reaction (ORR) catalytic activities (much higher than the 2015 U.S. Department of Energy (DOE)
target values), which are the rate-determining steps in electrochemical energy devices, in terms of onset-potential, halfwave
potential, specific-activity, mass-activity, stability, and durability. Moreover, the hybrid exhibits a highly stable mass
activity for the ORR over a wide pH range of 113. These exceptional properties would make the hybrid applicable in nextgeneration
electrochemical energy devices.
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