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

Xiao, Weiping; Zhu, Jing; Han, Lili; Liu, Sufen; Wang, Jie; Wu, Zexing; Lei, Wen; Xuan, Cuijuan; Xin, Huolin L.; Wang, Deli

doi:10.1039/C6NR03944H

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

Journal Article · Fri Jul 15 00:00:00 EDT 2016 · Nanoscale

DOI:https://doi.org/10.1039/C6NR03944H· OSTI ID:1336138

Xiao, Weiping ^[1]; Zhu, Jing ^[1]; Han, Lili ^[2]; Liu, Sufen ^[1]; Wang, Jie ^[1]; Wu, Zexing ^[1]; Lei, Wen ^[1]; Xuan, Cuijuan ^[1]; Xin, Huolin L. ^[2]; Wang, Deli ^[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
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials

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 Pd₈CoZn/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 Pd₈CoZn/C nanocatalysts. Interestingly, after 10 000 potential cycles in N₂-saturated 0.1 M HClO₄ solution, Pd₈CoZn@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 O₂-saturated 0.1 M HClO₄ solution for 30 000 potential cycles, the half-wave 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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1336138

Report Number(s):: BNL-112612-2016-JA; NANOHL; R&D Project: 16060; 16060; KC0403020

Journal Information:: Nanoscale, Vol. 8, Issue 31; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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