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Title: Pt skin on Pd–Co–Zn/C ternary nanoparticles with enhanced Pt efficiency toward ORR

Exploring highly active, stable and relatively low-cost nanomaterials for the oxygen reduction reaction (ORR) is of vital importance for the commercialization of proton exchange membrane fuel cells (PEMFCs). A highly active, durable, carbon supported, and monolayer Pt coated Pd–Co–Zn nanoparticle is synthesized via a simple impregnation–reduction method, followed by spontaneous displacement of Pt. By tuning the atomic ratios, we obtain the composition–activity volcano curve for the Pd–Co–Zn nanoparticles and determined that Pd : Co : Zn = 8 : 1 : 1 is the optimal composition. Compared with pure Pd/C, the Pd 8CoZn/C nanoparticles show a substantial enhancement in both the catalytic activity and the durability toward the ORR. Moreover, the durability and activity are further enhanced by forming a Pt skin on Pd 8CoZn/C nanocatalysts. Interestingly, after 10 000 potential cycles in N 2-saturated 0.1 M HClO 4 solution, Pd 8CoZn@Pt/C shows improved mass activity (2.62 A mg -1Pt) and specific activity (4.76 A m -2total), which are about 1.4 and 4.4 times higher than the initial values, and 37.4 and 5.5 times higher than those of Pt/C catalysts, respectively. After accelerated stability testing in O 2-saturated 0.1 M HClO 4 solution for 30 000 potential cycles, the half-wavemore » potential negatively shifts about 6 mV. Our results show that the Pt skin plays an important role in enhancing the activity as well as preventing degradation.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Huazhong Univ. of Science and Technology, Wuhan (People's Republic of China). Key Lab. of Material Chemistry for Energy Conversion and Storage and Hubei Key Lab. of Material Chemistry and Service Failure
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Publication Date:
Report Number(s):
BNL-112612-2016-JA
Journal ID: ISSN 2040-3364; NANOHL; R&D Project: 16060; 16060; KC0403020
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 8; Journal Issue: 31; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Oxygen Reduction Reaction; Fuel Cell; Center for Functional Nanomaterials
OSTI Identifier:
1336138