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Title: Optimizing the ORR activity of Pd based nanocatalysts by tuning their strain and particle size

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/C7TA02479G· OSTI ID:1431451
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  1. Huazhong Univ. of Science and Technology, Wuhan (China). Ministry of Education and Key Lab. of Material Chemistry for Energy Conversion and Storage, Hubei Key Lab. of Material Chemistry and Service Failure and School of Chemistry and Chemical Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  3. Tianjin Univ. (China). School of Materials Science and Engineering

Controlling of the particle size and surface strain is the key to tuning the surface chemistry and optimizing the catalytic performance of electrocatalysts. In this study, we show that by introducing both Fe and Co into Pd lattices, the surface strain of Pd nanocatalysts can be tuned to optimize their oxygen reduction activity in both fuel cells and Zn–air batteries. The Pd2FeCo/C alloy particles are uniquely coated with an ultrathin Fe2O3 shell which is in situ formed during a thermal annealing treatment. The thin shell acts as an effective barrier that prevents the coalescence and ripening of Pd2FeCo/C nanoparticles. Compared with Pd/C, Pd2FeCo/C exhibits higher catalytic activity and long-term stability for the ORR, signifying changes in catalytic behavior due to particle sizes and strain effects. Moreover, by spontaneous decoration of Pt on the surface of Pd2FeCo/C, the Pd2FeCo@Pt/C core@shell structure was formed and the Pt mass activity was about 37.6 and 112.5 times higher than that on Pt/C in a 0.1 M HClO4 and KOH solution at 0.9 V, respectively, suggesting an enhanced ORR performance after Pt decoration. More interestingly, Pd2FeCo@Pt/C also shows a power density of ~308 mW cm-2, which is much higher than that of Pt/C (175 mW cm-2), and excellent durability in a home-made Zn–air battery.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Huazhong Univ. of Science and Technology, Wuhan (China)
Grant/Contract Number:
SC0012704; 21573083; NCET-13-0237
OSTI ID:
1431451
Report Number(s):
BNL-203451-2018-JAAM; JMCAET; TRN: US1802938
Journal Information:
Journal of Materials Chemistry. A, Vol. 5, Issue 20; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 86 works
Citation information provided by
Web of Science

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Cited By (13)

Unique Half Embedded/Exposed PdFeCu/C Interfacial Nanoalloy as High‐Performance Electrocatalyst for Oxygen Reduction Reaction journal June 2019
Highly‐Branched Palladium Nanodandelions: Simple, Fast, and Green Fabrication with Superior Oxygen Reduction Property journal March 2019
Yolk-Shell Fe/Fe 4 N@Pd/C Magnetic Nanocomposite as an Efficient Recyclable ORR Electrocatalyst and SERS Substrate journal January 2019
Electrodeposition-fabricated PtCu-alloy cathode catalysts for high-temperature proton exchange membrane fuel cells journal May 2018
Highly active zigzag-like Pt-Zn alloy nanowires with high-index facets for alcohol electrooxidation journal April 2019
Surface composition-tunable octahedral PtCu nanoalloys advance the electrocatalytic performance on methanol and ethanol oxidation journal July 2019
Dendritic defect-rich palladium–copper–cobalt nanoalloys as robust multifunctional non-platinum electrocatalysts for fuel cells journal September 2018
PDA-assisted formation of ordered intermetallic CoPt 3 catalysts with enhanced oxygen reduction activity and stability journal January 2018
Electrocatalytic activity of electrochemically dealloyed PdCu 3 intermetallic compound towards oxygen reduction reaction in acidic media journal January 2018
Tuning the electrocatalytic activity of Pt by structurally ordered PdFe/C for the hydrogen oxidation reaction in alkaline media journal January 2018
Interfacial proton enrichment enhances proton-coupled electrocatalytic reactions journal January 2018
Recent advancements in Pt-nanostructure-based electrocatalysts for the oxygen reduction reaction journal January 2019
DFT Study on Intermetallic Pd–Cu Alloy with Cover Layer Pd as Efficient Catalyst for Oxygen Reduction Reaction journal December 2017