Conformational effects of pt-shells on nanostructures and corresponding oxygen reduction reaction activity of au-cluster-decorated NiOx@pt nanocatalysts

Dinesh Bhalothia, Yu Jui Fan, Yen Chun Lai, Ya Tang Yang, Yaw Wen Yang, Chih Hao Lee, Tsan Yao Chen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Herein, ternary metallic nanocatalysts (NCs) consisting of Au clusters decorated with a Pt shell and a Ni oxide core underneath (called NPA) on carbon nanotube (CNT) support were synthesized by combining adsorption, precipitation, and chemical reduction methods. By a retrospective investigation of the physical structure and electrochemical results, we elucidated the effects of Pt/Ni ratios (0.4 and 1.0) and Au contents (2 and 9 wt.%) on the nanostructure and corresponding oxygen reduction reaction (ORR) activity of the NPA NCs. We found that the ORR activity of NPA NCs was mainly dominated by the Pt-shell thickness which regulated the depth and size of the surface decorated with Au clusters. In the optimal case, NPA-1004006 (with a Pt/Ni of 0.4 and Au of ~2 wt.%) showed a kinetic current (JK) of 75.02 mA cm−2 which was nearly 17-times better than that (4.37 mA cm−2) of the commercial Johnson Matthey-Pt/C (20 wt.% Pt) catalyst at 0.85 V vs. the reference hydrogen electrode. Such a high JK value resulted in substantial improvements in both the specific activity (by ~53-fold) and mass activity (by nearly 10-fold) in the same benchmark target. Those scenarios rationalize that ORR activity can be substantially improved by a syngeneic effect at heterogeneous interfaces among nanometer-sized NiOx, Pt, and Au clusters on the NC surface.

Original languageEnglish
Article number1003
JournalNanomaterials
Volume9
Issue number7
DOIs
Publication statusPublished - Jul 2019

Keywords

  • Au-clusters
  • Carbon nanotube
  • Mass activity
  • Nanocatalysts
  • Oxygen reduction reaction
  • Wet-chemical reduction method

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

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