Interconnected Pt-nanodendrite/DNA/reduced-graphene-oxide hybrid showing remarkable oxygen reduction activity and stability

Jitendra N. Tiwari, Kingsley Christian Kemp, Krishna Nath, Rajanish N. Tiwari, Hong Gil Nam, Kwang S. Kim

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

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-graphene-oxide (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, half-wave 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 1-13. These exceptional properties would make the hybrid applicable in next-generation electrochemical energy devices.

Original languageEnglish
Pages (from-to)9223-9231
Number of pages9
JournalACS Nano
Volume7
Issue number10
DOIs
StatePublished - 22 Oct 2013

Keywords

  • catalytic activity
  • DNA
  • fuel cells
  • oxygen reduction reaction
  • Pt nanodendrites

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