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Conformational Effects of Pt-Shells on Nanostructures and Corresponding Oxygen Reduction Reaction Activity of Au-Cluster-Decorated NiO(x)@Pt Nanocatalysts
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 t...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6669587/ https://www.ncbi.nlm.nih.gov/pubmed/31336802 http://dx.doi.org/10.3390/nano9071003 |
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author | Bhalothia, Dinesh Fan, Yu-Jui Lai, Yen-Chun Yang, Ya-Tang Yang, Yaw-Wen Lee, Chih-Hao Chen, Tsan-Yao |
author_facet | Bhalothia, Dinesh Fan, Yu-Jui Lai, Yen-Chun Yang, Ya-Tang Yang, Yaw-Wen Lee, Chih-Hao Chen, Tsan-Yao |
author_sort | Bhalothia, Dinesh |
collection | PubMed |
description | 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 (J(K)) 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 J(K) 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 NiO(x), Pt, and Au clusters on the NC surface. |
format | Online Article Text |
id | pubmed-6669587 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-66695872019-08-08 Conformational Effects of Pt-Shells on Nanostructures and Corresponding Oxygen Reduction Reaction Activity of Au-Cluster-Decorated NiO(x)@Pt Nanocatalysts Bhalothia, Dinesh Fan, Yu-Jui Lai, Yen-Chun Yang, Ya-Tang Yang, Yaw-Wen Lee, Chih-Hao Chen, Tsan-Yao Nanomaterials (Basel) Article 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 (J(K)) 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 J(K) 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 NiO(x), Pt, and Au clusters on the NC surface. MDPI 2019-07-11 /pmc/articles/PMC6669587/ /pubmed/31336802 http://dx.doi.org/10.3390/nano9071003 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article 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 NiO(x)@Pt Nanocatalysts |
title | Conformational Effects of Pt-Shells on Nanostructures and Corresponding Oxygen Reduction Reaction Activity of Au-Cluster-Decorated NiO(x)@Pt Nanocatalysts |
title_full | Conformational Effects of Pt-Shells on Nanostructures and Corresponding Oxygen Reduction Reaction Activity of Au-Cluster-Decorated NiO(x)@Pt Nanocatalysts |
title_fullStr | Conformational Effects of Pt-Shells on Nanostructures and Corresponding Oxygen Reduction Reaction Activity of Au-Cluster-Decorated NiO(x)@Pt Nanocatalysts |
title_full_unstemmed | Conformational Effects of Pt-Shells on Nanostructures and Corresponding Oxygen Reduction Reaction Activity of Au-Cluster-Decorated NiO(x)@Pt Nanocatalysts |
title_short | Conformational Effects of Pt-Shells on Nanostructures and Corresponding Oxygen Reduction Reaction Activity of Au-Cluster-Decorated NiO(x)@Pt Nanocatalysts |
title_sort | conformational effects of pt-shells on nanostructures and corresponding oxygen reduction reaction activity of au-cluster-decorated nio(x)@pt nanocatalysts |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6669587/ https://www.ncbi.nlm.nih.gov/pubmed/31336802 http://dx.doi.org/10.3390/nano9071003 |
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