Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation

By selectively dealloying a PtCoAl ternary alloy, a novel nanoporous PtCo (np-PtCo) alloy with a three-dimensional bicontinuous pore-ligament structure is successfully fabricated. X-ray diffraction and electron microscopic characterizations demonstrate the single-crystal nature of the alloy ligament...

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Main Authors: Qiu, Huajun, Zou, Feixue
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/96455
http://hdl.handle.net/10220/10281
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-964552020-03-07T11:35:37Z Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation Qiu, Huajun Zou, Feixue School of Chemical and Biomedical Engineering By selectively dealloying a PtCoAl ternary alloy, a novel nanoporous PtCo (np-PtCo) alloy with a three-dimensional bicontinuous pore-ligament structure is successfully fabricated. X-ray diffraction and electron microscopic characterizations demonstrate the single-crystal nature of the alloy ligament with a ligament size down to 3 nm. After a mild electrochemical dealloying process, a nanoporous near-surface alloy structure with a Pt-rich surface and a PtCo alloy core is obtained. Electrochemical measurements show that the np-PtCo surface alloy has greatly enhanced catalytic activity and durability toward methanol electrooxidation compared with a state-of-the-art Pt/C catalyst. The peak current density of methanol electrooxidation on a np-PtCo surface alloy is more than 5 times of that on Pt/C. More importantly, continuous potential cycling from 0.6 to 0.9 V (vs RHE) in a 0.5 M H2SO4 aqueous solution demonstrates that a np-PtCo surface alloy has excellent structure stability, with more than 90% of the initial electrochemical active surface area (EASA) retained after 5000 potential cycles. Under the same conditions, the EASA of Pt/C drops to 70%. With evident advantages of facile preparation as well as enhanced electrocatalytic activity and durability, a np-PtCo surface alloy nanomaterial holds great potential as an anode catalyst in direct methanol fuel cells. 2013-06-12T07:52:57Z 2019-12-06T19:31:03Z 2013-06-12T07:52:57Z 2019-12-06T19:31:03Z 2012 2012 Journal Article Qiu, H., & Zou, F. (2012). Nanoporous PtCo Surface Alloy Architecture with Enhanced Properties for Methanol Electrooxidation. ACS Applied Materials & Interfaces, 4(3), 1404-1410. 1944-8244 https://hdl.handle.net/10356/96455 http://hdl.handle.net/10220/10281 10.1021/am201659n en ACS applied materials & interfaces © 2012 American Chemical Society.
institution Nanyang Technological University
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country Singapore
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description By selectively dealloying a PtCoAl ternary alloy, a novel nanoporous PtCo (np-PtCo) alloy with a three-dimensional bicontinuous pore-ligament structure is successfully fabricated. X-ray diffraction and electron microscopic characterizations demonstrate the single-crystal nature of the alloy ligament with a ligament size down to 3 nm. After a mild electrochemical dealloying process, a nanoporous near-surface alloy structure with a Pt-rich surface and a PtCo alloy core is obtained. Electrochemical measurements show that the np-PtCo surface alloy has greatly enhanced catalytic activity and durability toward methanol electrooxidation compared with a state-of-the-art Pt/C catalyst. The peak current density of methanol electrooxidation on a np-PtCo surface alloy is more than 5 times of that on Pt/C. More importantly, continuous potential cycling from 0.6 to 0.9 V (vs RHE) in a 0.5 M H2SO4 aqueous solution demonstrates that a np-PtCo surface alloy has excellent structure stability, with more than 90% of the initial electrochemical active surface area (EASA) retained after 5000 potential cycles. Under the same conditions, the EASA of Pt/C drops to 70%. With evident advantages of facile preparation as well as enhanced electrocatalytic activity and durability, a np-PtCo surface alloy nanomaterial holds great potential as an anode catalyst in direct methanol fuel cells.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Qiu, Huajun
Zou, Feixue
format Article
author Qiu, Huajun
Zou, Feixue
spellingShingle Qiu, Huajun
Zou, Feixue
Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation
author_sort Qiu, Huajun
title Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation
title_short Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation
title_full Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation
title_fullStr Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation
title_full_unstemmed Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation
title_sort nanoporous ptco surface alloy architecture with enhanced properties for methanol electrooxidation
publishDate 2013
url https://hdl.handle.net/10356/96455
http://hdl.handle.net/10220/10281
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