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

1 Citation (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

Fingerprint

Nanostructures
Oxygen
Carbon Nanotubes
Oxides
Hydrogen
Carbon nanotubes
Adsorption
Electrodes
Catalysts
Kinetics

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)

Cite this

Conformational effects of pt-shells on nanostructures and corresponding oxygen reduction reaction activity of au-cluster-decorated NiOx@pt nanocatalysts. / Bhalothia, Dinesh; Fan, Yu Jui; Lai, Yen Chun; Yang, Ya Tang; Yang, Yaw Wen; Lee, Chih Hao; Chen, Tsan Yao.

In: Nanomaterials, Vol. 9, No. 7, 1003, 07.2019.

Research output: Contribution to journalArticle

Bhalothia, Dinesh ; Fan, Yu Jui ; Lai, Yen Chun ; Yang, Ya Tang ; Yang, Yaw Wen ; Lee, Chih Hao ; Chen, Tsan Yao. / Conformational effects of pt-shells on nanostructures and corresponding oxygen reduction reaction activity of au-cluster-decorated NiOx@pt nanocatalysts. In: Nanomaterials. 2019 ; Vol. 9, No. 7.
@article{d3ed4301acf844be8356a77cee4073f9,
title = "Conformational effects of pt-shells on nanostructures and corresponding oxygen reduction reaction activity of au-cluster-decorated NiOx@pt nanocatalysts",
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.",
keywords = "Au-clusters, Carbon nanotube, Mass activity, Nanocatalysts, Oxygen reduction reaction, Wet-chemical reduction method",
author = "Dinesh Bhalothia and Fan, {Yu Jui} and Lai, {Yen Chun} and Yang, {Ya Tang} and Yang, {Yaw Wen} and Lee, {Chih Hao} and Chen, {Tsan Yao}",
year = "2019",
month = "7",
doi = "10.3390/nano9071003",
language = "English",
volume = "9",
journal = "Nanomaterials",
issn = "2079-4991",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "7",

}

TY - JOUR

T1 - Conformational effects of pt-shells on nanostructures and corresponding oxygen reduction reaction activity of au-cluster-decorated NiOx@pt nanocatalysts

AU - Bhalothia, Dinesh

AU - Fan, Yu Jui

AU - Lai, Yen Chun

AU - Yang, Ya Tang

AU - Yang, Yaw Wen

AU - Lee, Chih Hao

AU - Chen, Tsan Yao

PY - 2019/7

Y1 - 2019/7

N2 - 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.

AB - 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.

KW - Au-clusters

KW - Carbon nanotube

KW - Mass activity

KW - Nanocatalysts

KW - Oxygen reduction reaction

KW - Wet-chemical reduction method

UR - http://www.scopus.com/inward/record.url?scp=85073293112&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85073293112&partnerID=8YFLogxK

U2 - 10.3390/nano9071003

DO - 10.3390/nano9071003

M3 - Article

AN - SCOPUS:85073293112

VL - 9

JO - Nanomaterials

JF - Nanomaterials

SN - 2079-4991

IS - 7

M1 - 1003

ER -