Carbon-supported metal nanodendrites as efficient, stable catalysts for the oxygen reduction reaction

被引:33
作者
Venarusso, Luna B. [1 ]
Boone, Chirley V. [1 ]
Bettini, Jefferson [2 ]
Maia, Gilberto [1 ]
机构
[1] Univ Fed Mato Grosso do Sul, Inst Chem, Av Senador Filinto Muller 1555, BR-79074460 Campo Grande, MS, Brazil
[2] Brazilian Nanotechnol Natl Lab LNNano, Rua Giuseppe Maximo Scolfaro 10000, BR-13083100 Campinas, SP, Brazil
关键词
CORE-SHELL NANOPARTICLES; PDPT ALLOY NANOCUBES; PT-PD; BIMETALLIC NANOCRYSTALS; PALLADIUM ELECTRODE; ENHANCED ACTIVITY; FACILE SYNTHESIS; PLATINUM; ELECTROCATALYSTS; SHAPE;
D O I
10.1039/c7ta08964c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The search for efficient, stable electrocatalysts for the oxygen reduction reaction (ORR) has received increased attention, given the need to speed up this reaction in fuel cells. This article reports the onepot synthesis of novel metal nanodendrites (MNDs) of Pt or Pt-Pd alloy surface-covering patterns that, supported on Vulcan Carbon XC-72, effectively catalyzed the ORR. The surface of Vulcan Carbon XC-72 exhibits raised plains interspersed with ribbed troughs, in a pattern energetically favorable to metal precipitation (deposition) into the ribbed troughs. This produces MND/C structures that are strongly catalytic toward the ORR. Mass-specific activity (MSA) of 0.56 mA mg(-1) and specific activity (SA) in the 1.17-1.35 mA cm(-2) range are noteworthy findings for Pt/C, Pt@ Au0/C, and Pt-Pd/C MND electrocatalysts at 0.9 ViR-free, using platinum-group metal (PGM) loadings as low as 26 mg cm(-2)-better values, therefore, than the United States Department of Energy (DOE) targets for MSA (0.44 A mg(Pt)(-1)) and SA (0.72 mA cm(-2) at 0.9 ViR-free) for electrocatalysts used in portable applications to be marketed in 2017, and for cathode areal PGM loadings (< 50 mu g(PGM) cm(-2)), as well as better than the commercial E-Tek Pt/C (20% Pt mass) catalyst.
引用
收藏
页码:1714 / 1726
页数:13
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