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.
| Original language | English |
|---|---|
| Pages (from-to) | 1220-1230 |
| Number of pages | 11 |
| Journal | ACS Catalysis |
| Volume | 3 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2013 Jun 25 |
| Externally published | Yes |
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Keywords
- bimetallic catalysis
- dealloying
- direct ethanol fuel cell
- nanoporous alloy
- Pd-Au catalyst
- surface electronic structure
ASJC Scopus subject areas
- Catalysis
Cite this
Geometrically controlled nanoporous PdAu bimetallic catalysts with tunable Pd/Au ratio for direct ethanol fuel cells. / Chen, L. Y.; Chen, N.; Hou, Y.; Wang, Z. C.; Lv, S. H.; Fujita, T.; Jiang, J. H.; Hirata, Akihiko; Chen, M. W.
In: ACS Catalysis, Vol. 3, No. 6, 25.06.2013, p. 1220-1230.Research output: Contribution to journal › Article
}
TY - JOUR
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, Akihiko
AU - Chen, M. W.
PY - 2013/6/25
Y1 - 2013/6/25
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 - bimetallic catalysis
KW - dealloying
KW - direct ethanol fuel cell
KW - nanoporous alloy
KW - Pd-Au catalyst
KW - surface electronic structure
UR - http://www.scopus.com/inward/record.url?scp=84879165198&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84879165198&partnerID=8YFLogxK
U2 - 10.1021/cs400135k
DO - 10.1021/cs400135k
M3 - Article
AN - SCOPUS:84879165198
VL - 3
SP - 1220
EP - 1230
JO - ACS Catalysis
JF - ACS Catalysis
SN - 2155-5435
IS - 6
ER -