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

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

122 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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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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pages = "1220--1230",

journal = "ACS Catalysis",

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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

ASJC Scopus subject areas

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