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...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
|
| Online Access: | https://hdl.handle.net/10356/96455 http://hdl.handle.net/10220/10281 |
| _version_ | 1826129846879649792 |
|---|---|
| author | Qiu, Huajun Zou, Feixue |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Qiu, Huajun Zou, Feixue |
| author_sort | Qiu, Huajun |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T07:46:54Z |
| format | Journal Article |
| id | ntu-10356/96455 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:46:54Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-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. |
| spellingShingle | Qiu, Huajun Zou, Feixue Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation |
| title | 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_short | Nanoporous PtCo surface alloy architecture with enhanced properties for methanol electrooxidation |
| title_sort | nanoporous ptco surface alloy architecture with enhanced properties for methanol electrooxidation |
| url | https://hdl.handle.net/10356/96455 http://hdl.handle.net/10220/10281 |
| work_keys_str_mv | AT qiuhuajun nanoporousptcosurfacealloyarchitecturewithenhancedpropertiesformethanolelectrooxidation AT zoufeixue nanoporousptcosurfacealloyarchitecturewithenhancedpropertiesformethanolelectrooxidation |