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Title: Active and stable Ir@Pt core–shell catalysts for electrochemical oxygen reduction

Journal Article · · ACS Energy Letters
 [1];  [1]; ORCiD logo [2]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Electrochemical oxygen reduction is an important reaction for many sustainable energy technologies, such as fuel cells and metal–air batteries. Kinetic limitations of this reaction, expensive electrocatalysts, and catalyst instability, however, limit the commercial viability of such devices. Herein, we report an active Ir@Pt core–shell catalyst that combines platinum overlayers with nanostructure effects to tune the oxygen binding to the Pt surface, thereby achieving enhanced activity and stability for the oxygen reduction reaction. Ir@Pt nanoparticles with several shell thicknesses were synthesized in a scalable, inexpensive, one-pot polyol method. Electrochemical analysis demonstrates the activity and stability of the Ir@Pt catalyst, with specific and mass activities increasing to 2.6 and 1.8 times that of commercial Pt/C (TKK), respectively, after 10 000 stability cycles. Furthermore, activity enhancement of the Ir@Pt catalyst is attributed to weakening of the oxygen binding to the Pt surface induced by the Ir core.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1349289
Journal Information:
ACS Energy Letters, Vol. 2, Issue 1; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 56 works
Citation information provided by
Web of Science

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  • Stephens, Ifan E. L.; Bondarenko, Alexander S.; Perez-Alonso, Francisco J.
  • Journal of the American Chemical Society, Vol. 133, Issue 14 https://doi.org/10.1021/ja111690g
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Cited By (12)

Noble metal supported hexagonal boron nitride for the oxygen reduction reaction: a DFT study journal January 2019
Fabrication of Superior Single‐Atom Catalysts toward Diverse Electrochemical Reactions journal February 2019
A review of Pt-based electrocatalysts for oxygen reduction reaction journal May 2017
Single Metal Atoms Anchored in Two-Dimensional Materials: Bifunctional Catalysts for Fuel Cell Applications journal May 2018
A Comprehensive Review on Controlling Surface Composition of Pt-Based Bimetallic Electrocatalysts journal April 2018
Pt-loaded Au@CeO 2 core–shell nanocatalysts for improving methanol oxidation reaction activity journal January 2019
Engineering Ru@Pt Core-Shell Catalysts for Enhanced Electrochemical Oxygen Reduction Mass Activity and Stability journal January 2018
Hollow nanoparticles as emerging electrocatalysts for renewable energy conversion reactions journal January 2018
Ordered platinum–bismuth intermetallic clusters with Pt-skin for a highly efficient electrochemical ethanol oxidation reaction journal January 2019
Facile synthesis of Pt-decorated Ir black as a bifunctional oxygen catalyst for oxygen reduction and evolution reactions journal January 2019
Engineering stable electrocatalysts by synergistic stabilization between carbide cores and Pt shells journal December 2019
Tuning the Catalytic Activity of Ir@Pt Nanoparticles Through Controlling Ir Core Size on Cathode Performance for PEM Fuel Cell Application journal July 2018