Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation
Carbon-supported bimetallic Pt-Co cathode catalysts have been previously identified as higher activity alternatives to conventional Pt/C catalysts for fuel cells. In this work, a series of Pt-Co/C catalysts were synthesized using electroless deposition (ED) of Pt on a Co/C catalyst prepared by modif...
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| Format: | Article |
| Language: | English |
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MDPI AG
2016-06-01
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| Series: | Catalysts |
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| Online Access: | http://www.mdpi.com/2073-4344/6/6/83 |
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| author | John Meynard M. Tengco Bahareh Alsadat Tavakoli Mehrabadi Yunya Zhang Akkarat Wongkaew John R. Regalbuto John W. Weidner John R. Monnier |
| author_facet | John Meynard M. Tengco Bahareh Alsadat Tavakoli Mehrabadi Yunya Zhang Akkarat Wongkaew John R. Regalbuto John W. Weidner John R. Monnier |
| author_sort | John Meynard M. Tengco |
| collection | DOAJ |
| description | Carbon-supported bimetallic Pt-Co cathode catalysts have been previously identified as higher activity alternatives to conventional Pt/C catalysts for fuel cells. In this work, a series of Pt-Co/C catalysts were synthesized using electroless deposition (ED) of Pt on a Co/C catalyst prepared by modified charge enhanced dry impregnation. X-ray diffraction (XRD) and scanning transmission electron microscopy (STEM) characterization of the base catalyst showed highly dispersed particles. A basic ED bath containing PtCl62− as the Pt precursor, dimethylamine borane as reducing agent, and ethylenediamine as stabilizing agent successfully targeted deposition of Pt on Co particles. Simultaneous action of galvanic displacement and ED resulted in Pt-Co alloy formation observed in XRD and energy dispersive X-ray spectroscopy (XEDS) mapping. In addition, fast deposition kinetics resulted in hollow shell Pt-Co alloy particles while particles with Pt-rich shell and Co-rich cores formed with controlled Pt deposition. Electrochemical evaluation of the Pt-Co/C catalysts showed lower active surface but much higher mass and surface activities for oxygen reduction reaction compared to a commercial Pt/C fuel cell catalyst. |
| first_indexed | 2024-04-13T11:08:29Z |
| format | Article |
| id | doaj.art-1f58b44838364654b22026822fdffa1c |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-04-13T11:08:29Z |
| publishDate | 2016-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-1f58b44838364654b22026822fdffa1c2022-12-22T02:49:11ZengMDPI AGCatalysts2073-43442016-06-01668310.3390/catal6060083catal6060083Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry ImpregnationJohn Meynard M. Tengco0Bahareh Alsadat Tavakoli Mehrabadi1Yunya Zhang2Akkarat Wongkaew3John R. Regalbuto4John W. Weidner5John R. Monnier6Department of Chemical Engineering, College of Engineering and Computing, University of South Carolina, 301 Main St., Columbia, SC 29208, USADepartment of Chemical Engineering, College of Engineering and Computing, University of South Carolina, 301 Main St., Columbia, SC 29208, USADepartment of Chemical Engineering, College of Engineering and Computing, University of South Carolina, 301 Main St., Columbia, SC 29208, USADepartment of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi 20131, ThailandDepartment of Chemical Engineering, College of Engineering and Computing, University of South Carolina, 301 Main St., Columbia, SC 29208, USADepartment of Chemical Engineering, College of Engineering and Computing, University of South Carolina, 301 Main St., Columbia, SC 29208, USADepartment of Chemical Engineering, College of Engineering and Computing, University of South Carolina, 301 Main St., Columbia, SC 29208, USACarbon-supported bimetallic Pt-Co cathode catalysts have been previously identified as higher activity alternatives to conventional Pt/C catalysts for fuel cells. In this work, a series of Pt-Co/C catalysts were synthesized using electroless deposition (ED) of Pt on a Co/C catalyst prepared by modified charge enhanced dry impregnation. X-ray diffraction (XRD) and scanning transmission electron microscopy (STEM) characterization of the base catalyst showed highly dispersed particles. A basic ED bath containing PtCl62− as the Pt precursor, dimethylamine borane as reducing agent, and ethylenediamine as stabilizing agent successfully targeted deposition of Pt on Co particles. Simultaneous action of galvanic displacement and ED resulted in Pt-Co alloy formation observed in XRD and energy dispersive X-ray spectroscopy (XEDS) mapping. In addition, fast deposition kinetics resulted in hollow shell Pt-Co alloy particles while particles with Pt-rich shell and Co-rich cores formed with controlled Pt deposition. Electrochemical evaluation of the Pt-Co/C catalysts showed lower active surface but much higher mass and surface activities for oxygen reduction reaction compared to a commercial Pt/C fuel cell catalyst.http://www.mdpi.com/2073-4344/6/6/83electroless depositionfuel cellsbimetallic catalystplatinum-cobalt alloy |
| spellingShingle | John Meynard M. Tengco Bahareh Alsadat Tavakoli Mehrabadi Yunya Zhang Akkarat Wongkaew John R. Regalbuto John W. Weidner John R. Monnier Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation Catalysts electroless deposition fuel cells bimetallic catalyst platinum-cobalt alloy |
| title | Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation |
| title_full | Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation |
| title_fullStr | Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation |
| title_full_unstemmed | Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation |
| title_short | Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation |
| title_sort | synthesis and electrochemical evaluation of carbon supported pt co bimetallic catalysts prepared by electroless deposition and modified charge enhanced dry impregnation |
| topic | electroless deposition fuel cells bimetallic catalyst platinum-cobalt alloy |
| url | http://www.mdpi.com/2073-4344/6/6/83 |
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