Huang, XQ (reprint author), Soochow Univ, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Jiangsu, Peoples R China.
; Guo, SJ (reprint author), Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China.
; Guo, SJ (reprint author), Peking Univ, Coll Engn, Dept Energy & Resources Engn, Beijing 100871, Peoples R China.
; Guo, SJ (reprint author), Peking Univ, Beijing Innovat Ctr Engn Sci & Adv Technol BIC ES, Coll Engn, Beijing 100871, Peoples R China.
; Guo, SJ (reprint author), Peking Univ, Key Lab Theory & Technol Adv Batteries Mat, Coll Engn, Beijing 100871, Peoples R China.
; Su, D (reprint author), Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
文章类型:
期刊论文
英文摘要:
Compressive surface strains have been necessary to boost oxygen reduction reaction (ORR) activity in core/shell M/platinum (Pt) catalysts (where M can be nickel, cobalt, or iron). We report on a class of platinum-lead/platinum (PtPb/Pt) core/shell nanoplate catalysts that exhibit large biaxial strains. The stable Pt (110) facets of the nanoplates have high ORR specific and mass activities that reach 7.8 milliampere (mA) per centimeter squared and 4.3 ampere per milligram of platinum at 0.9 volts versus the reversible hydrogen electrode (RHE), respectively. Density functional theory calculations reveal that the edge-Pt and top (bottom)-Pt (110) facets undergo large tensile strains that help optimize the Pt-O bond strength. The intermetallic core and uniform four layers of Pt shell of the PtPb/Pt nanoplates appear to underlie the high endurance of these catalysts, which can undergo 50,000 voltage cycles with negligible activity decay and no apparent structure and composition changes.
