Journal
JOURNAL OF CATALYSIS
Volume 375, Issue -, Pages 164-170Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.05.031
Keywords
PtCu alloy; Nanospheres; Hydrogen evolution reaction; Oxygen reduction reaction; Electrocatalyst; DFT calculation
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Funding
- Fundamental Research Funds for the Central Universities [WUT: 2017111055, 2018111039GX, 2018IVA095]
- National Natural Science Foundation of China (NSFC) [51672204, 21875221]
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology [2019-KF-13]
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Because of high electrocatalytic activity, Pt based metal nanospheres (NSs) have attracted a lot of attention. Hence, multi-particle nano-single crystal coalesced PtCu NSs are designed and successfully synthesized by a cost-effective aqueous solution method. The formed PtCu NS catalyst exhibits a superior hydrogen evolution reaction (HER) electrocatalytic activity with an ultralow onset potential of 18 mV at the current density of 2 mA/cm(2) and high mass activity of 1.08 A/mg(pt) (7.2 times higher than that of commercial Pt/C catalysts). Also, it shows an enhancement of 3.2 and 2.7 times in the mass and specific activities toward oxygen reduction reaction (ORR) compared to that of Pt/C. Moreover, it possesses an excellent catalytic durability for both ORR and HER. Even after 10,000 cycles, its ORR mass activity retains 87% of its initial value. The density functional theory (DFT) calculations demonstrate that by introducing Cu atoms into the Pt lattice, a downshift of the D-band center and favorable hydrogen adsorption free energy of approaching to zero (Delta G) occur, indicating the increased electrocatalytic activity of Pt electrocatalysts. (C) 2019 Elsevier Inc. All rights reserved.
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