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Title: Monodisperse core/shell Ni/FePt nanoparticles and their con-version to Ni/Pt to catalyze oxygen reduction

Abstract

We report a size-controllable synthesis of monodisperse core/shell Ni/FePt nanoparticles (NPs) via a seed-mediated growth and their subsequent conversion to Ni/Pt NPs. Preventing surface oxidation of the Ni seeds is essential for the growth of uniform FePt shells. These Ni/FePt NPs have a thin (≈ 1 nm) FePt shell, and can be converted to Ni/Pt by acetic acid wash to yield active catalysts for oxygen reduction reaction (ORR). Tuning the core size allow for optimization of their electrocatalytic activity. The specific activity and mass activity of 4.2 nm/0.8 nm core/shell Ni/FePt reach 1.95 mA/cm² and 490 mA/mgPt at 0.9 V (vs. reversible hydrogen electrode, RHE), which are much higher than those of benchmark commercial Pt catalyst (0.34 mA/cm² and 92 mA/mgPt at 0.9 V). Our studies provide a robust approach to monodisperse core/shell NPs with non-precious metal core, making it possible to develop advanced NP catalysts with ultralow Pt content for ORR and many other heterogeneous reactions.

Authors:
 [1];  [1];  [2];  [1];  [1];  [2];  [3];  [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Brown Univ., Providence, RI (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1182492
Report Number(s):
BNL-107369-2015-JA
Journal ID: ISSN 0002-7863; R&D Project: 16060; KC0403020
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 136; Journal Issue: 45; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY, AND ECONOMY; functional nanomaterials

Citation Formats

Zhang, Sen, Hao, Yizhou, Su, Dong, Doan-Nguyen, Vicky V. T., Wu, Yaoting, Li, Jing, Sun, Shouheng, and Murray, Christopher B. Monodisperse core/shell Ni/FePt nanoparticles and their con-version to Ni/Pt to catalyze oxygen reduction. United States: N. p., 2014. Web. doi:10.1021/ja5099066.
Zhang, Sen, Hao, Yizhou, Su, Dong, Doan-Nguyen, Vicky V. T., Wu, Yaoting, Li, Jing, Sun, Shouheng, & Murray, Christopher B. Monodisperse core/shell Ni/FePt nanoparticles and their con-version to Ni/Pt to catalyze oxygen reduction. United States. https://doi.org/10.1021/ja5099066
Zhang, Sen, Hao, Yizhou, Su, Dong, Doan-Nguyen, Vicky V. T., Wu, Yaoting, Li, Jing, Sun, Shouheng, and Murray, Christopher B. Tue . "Monodisperse core/shell Ni/FePt nanoparticles and their con-version to Ni/Pt to catalyze oxygen reduction". United States. https://doi.org/10.1021/ja5099066. https://www.osti.gov/servlets/purl/1182492.
@article{osti_1182492,
title = {Monodisperse core/shell Ni/FePt nanoparticles and their con-version to Ni/Pt to catalyze oxygen reduction},
author = {Zhang, Sen and Hao, Yizhou and Su, Dong and Doan-Nguyen, Vicky V. T. and Wu, Yaoting and Li, Jing and Sun, Shouheng and Murray, Christopher B.},
abstractNote = {We report a size-controllable synthesis of monodisperse core/shell Ni/FePt nanoparticles (NPs) via a seed-mediated growth and their subsequent conversion to Ni/Pt NPs. Preventing surface oxidation of the Ni seeds is essential for the growth of uniform FePt shells. These Ni/FePt NPs have a thin (≈ 1 nm) FePt shell, and can be converted to Ni/Pt by acetic acid wash to yield active catalysts for oxygen reduction reaction (ORR). Tuning the core size allow for optimization of their electrocatalytic activity. The specific activity and mass activity of 4.2 nm/0.8 nm core/shell Ni/FePt reach 1.95 mA/cm² and 490 mA/mgPt at 0.9 V (vs. reversible hydrogen electrode, RHE), which are much higher than those of benchmark commercial Pt catalyst (0.34 mA/cm² and 92 mA/mgPt at 0.9 V). Our studies provide a robust approach to monodisperse core/shell NPs with non-precious metal core, making it possible to develop advanced NP catalysts with ultralow Pt content for ORR and many other heterogeneous reactions.},
doi = {10.1021/ja5099066},
journal = {Journal of the American Chemical Society},
number = 45,
volume = 136,
place = {United States},
year = {2014},
month = {10}
}

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