Precursor-templated synthesis of thermodynamically unfavored platinum nanoplates for the oxygen reduction reaction

Tatsuichiro Nakamoto, Ken Ichi Motomiya, Shun Yokoyama, Hideyuki Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

Controlling the shape of Pt-based nanomaterials is a major strategy to enhance the electrocatalytic performance towards the oxygen reduction reaction (ORR). Since the Pt (111) facet exhibits desirable electrochemical properties, Pt nanoplates enclosed by {111} facets are promising candidates. However, plate-shaped Pt crystals have thermodynamically unfavored structures, making syntheses challenging. Here we report a novel precursor-templated route to synthesize Pt nanoplates. Specifically, precipitated (NH4)2PtCl6 prepared in aqueous solution is used as the Pt precursor followed by the addition of NaBH4 as a reducing agent. With domain matching epitaxy, Pt nanoplates grow on the surface of the precipitated precursor, selectively exposing the {111} facets. Compared to those of commercial Pt/C at 0.90 and 0.85 V, the ORR properties of Pt nanoplates display a 1.5-and 5.2-fold enhancement in the mass activity, and a 3.3-and 11.6-fold enhancement in the specific activity, respectively. The superior ORR activities and the unique shape of Pt nanoplates are maintained for at least 5000 potential cycles.

Original languageEnglish
Pages (from-to)15837-15842
Number of pages6
JournalDalton Transactions
Volume49
Issue number44
DOIs
Publication statusPublished - 2020 Nov 28

ASJC Scopus subject areas

  • Inorganic Chemistry

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