Geometrically controlled nanoporous PdAu bimetallic catalysts with tunable Pd/Au ratio for direct ethanol fuel cells

L. Y. Chen; N. Chen; Y. Hou; Z. C. Wang; S. H. Lv; T. Fujita; J. H. Jiang; A. Hirata; M. W. Chen

doi:10.1021/cs400135k

Geometrically controlled nanoporous PdAu bimetallic catalysts with tunable Pd/Au ratio for direct ethanol fuel cells

L. Y. Chen, N. Chen, Y. Hou, Z. C. Wang, S. H. Lv, T. Fujita, J. H. Jiang, A. Hirata, M. W. Chen^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

134 Citations (Scopus)

Abstract

We report nanoporous Pd_100-xAu_x (x = 0, 25, 50, 75, 100; np-PdAu) bimetallic catalysts fabricated by electrochemically dealloying isomorphous Pd_20-yAu_yNi₈₀ (y = 0, 5, 15, 20) precursors. The chemical composition of the nanoporous bimetallic catalysts can be precisely controlled by predesigning Pd/Au ratios in the ternary alloys. Dealloying at an appropriate potential for each alloy can selectively leach Ni away while the Pd and Au remain intact to form a geometrically controllable nanoporous structure. The electrocatalysis of the np-PdAu shows evident dependence on the Au/Pd atomic ratio, and the np-Pd₇₅Au₂₅ bimetallic catalyst shows superior electrocatalytic performance toward ethanol electrooxidation in comparison with commercial Pt/C, np-Pd, and other np-PdAu alloys. Since there are no obvious geometric shape and pore size disparities among the np-PdAu samples, the dealloyed catalysts also provide an ideal system to explore the chemical origins of the excellent catalytic properties of bimetallic catalysts.

Original language	English
Pages (from-to)	1220-1230
Number of pages	11
Journal	ACS Catalysis
Volume	3
Issue number	6
DOIs	https://doi.org/10.1021/cs400135k
Publication status	Published - 2013
Externally published	Yes

Keywords

Pd-Au catalyst
bimetallic catalysis
dealloying
direct ethanol fuel cell
nanoporous alloy
surface electronic structure

ASJC Scopus subject areas

Catalysis
Chemistry(all)

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10.1021/cs400135k

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title = "Geometrically controlled nanoporous PdAu bimetallic catalysts with tunable Pd/Au ratio for direct ethanol fuel cells",

abstract = "We report nanoporous Pd100-xAux (x = 0, 25, 50, 75, 100; np-PdAu) bimetallic catalysts fabricated by electrochemically dealloying isomorphous Pd20-yAuyNi80 (y = 0, 5, 15, 20) precursors. The chemical composition of the nanoporous bimetallic catalysts can be precisely controlled by predesigning Pd/Au ratios in the ternary alloys. Dealloying at an appropriate potential for each alloy can selectively leach Ni away while the Pd and Au remain intact to form a geometrically controllable nanoporous structure. The electrocatalysis of the np-PdAu shows evident dependence on the Au/Pd atomic ratio, and the np-Pd75Au25 bimetallic catalyst shows superior electrocatalytic performance toward ethanol electrooxidation in comparison with commercial Pt/C, np-Pd, and other np-PdAu alloys. Since there are no obvious geometric shape and pore size disparities among the np-PdAu samples, the dealloyed catalysts also provide an ideal system to explore the chemical origins of the excellent catalytic properties of bimetallic catalysts.",

keywords = "Pd-Au catalyst, bimetallic catalysis, dealloying, direct ethanol fuel cell, nanoporous alloy, surface electronic structure",

author = "Chen, {L. Y.} and N. Chen and Y. Hou and Wang, {Z. C.} and Lv, {S. H.} and T. Fujita and Jiang, {J. H.} and A. Hirata and Chen, {M. W.}",

year = "2013",

doi = "10.1021/cs400135k",

language = "English",

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T1 - Geometrically controlled nanoporous PdAu bimetallic catalysts with tunable Pd/Au ratio for direct ethanol fuel cells

AU - Chen, L. Y.

AU - Chen, N.

AU - Hou, Y.

AU - Wang, Z. C.

AU - Lv, S. H.

AU - Fujita, T.

AU - Jiang, J. H.

AU - Hirata, A.

AU - Chen, M. W.

PY - 2013

Y1 - 2013

N2 - We report nanoporous Pd100-xAux (x = 0, 25, 50, 75, 100; np-PdAu) bimetallic catalysts fabricated by electrochemically dealloying isomorphous Pd20-yAuyNi80 (y = 0, 5, 15, 20) precursors. The chemical composition of the nanoporous bimetallic catalysts can be precisely controlled by predesigning Pd/Au ratios in the ternary alloys. Dealloying at an appropriate potential for each alloy can selectively leach Ni away while the Pd and Au remain intact to form a geometrically controllable nanoporous structure. The electrocatalysis of the np-PdAu shows evident dependence on the Au/Pd atomic ratio, and the np-Pd75Au25 bimetallic catalyst shows superior electrocatalytic performance toward ethanol electrooxidation in comparison with commercial Pt/C, np-Pd, and other np-PdAu alloys. Since there are no obvious geometric shape and pore size disparities among the np-PdAu samples, the dealloyed catalysts also provide an ideal system to explore the chemical origins of the excellent catalytic properties of bimetallic catalysts.

AB - We report nanoporous Pd100-xAux (x = 0, 25, 50, 75, 100; np-PdAu) bimetallic catalysts fabricated by electrochemically dealloying isomorphous Pd20-yAuyNi80 (y = 0, 5, 15, 20) precursors. The chemical composition of the nanoporous bimetallic catalysts can be precisely controlled by predesigning Pd/Au ratios in the ternary alloys. Dealloying at an appropriate potential for each alloy can selectively leach Ni away while the Pd and Au remain intact to form a geometrically controllable nanoporous structure. The electrocatalysis of the np-PdAu shows evident dependence on the Au/Pd atomic ratio, and the np-Pd75Au25 bimetallic catalyst shows superior electrocatalytic performance toward ethanol electrooxidation in comparison with commercial Pt/C, np-Pd, and other np-PdAu alloys. Since there are no obvious geometric shape and pore size disparities among the np-PdAu samples, the dealloyed catalysts also provide an ideal system to explore the chemical origins of the excellent catalytic properties of bimetallic catalysts.

KW - Pd-Au catalyst

KW - bimetallic catalysis

KW - dealloying

KW - direct ethanol fuel cell

KW - nanoporous alloy

KW - surface electronic structure

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Geometrically controlled nanoporous PdAu bimetallic catalysts with tunable Pd/Au ratio for direct ethanol fuel cells

Abstract

Keywords

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