Development of Pt/Au-Co composite electrode as a highly durable and efficient electrocatalyst for methanol electro-oxidation in alkaline media
Humayra Begum
Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh
Search for more papers by this authorMohammed M. Rahman
Deparment of Chemistry & Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah, Saudi Arabia
Search for more papers by this authorCorresponding Author
Mohammad A. Hasnat
Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh
Bangladesh Academy of Sciences, Agargaon, Dhaka, Bangladesh
Correspondence
Mohammad A. Hasnat, Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet 3100, Bangladesh.
Email: [email protected]; [email protected]
Search for more papers by this authorHumayra Begum
Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh
Search for more papers by this authorMohammed M. Rahman
Deparment of Chemistry & Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah, Saudi Arabia
Search for more papers by this authorCorresponding Author
Mohammad A. Hasnat
Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh
Bangladesh Academy of Sciences, Agargaon, Dhaka, Bangladesh
Correspondence
Mohammad A. Hasnat, Electrochemistry & Catalysis Research Laboratory (ECRL), Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet 3100, Bangladesh.
Email: [email protected]; [email protected]
Search for more papers by this authorFunding information: Deputyship for Research and Innovation, Ministry of Education, Saudi Arabia, Grant/Award Number: IFPRP: 568-130-1442
Summary
Pt metal is well known for exhibiting superior catalytic activity towards methanol electro-oxidation process but, it is highly poisoned by the intermediate carbonaceous species (CO) which degrade the catalytic activity over time. In this regard, a noble trimetallic electrode was prepared by modifying an unsupported polycrystalline Pt electrode with a mixture of Au and Co through a simple, one-step electrochemical deposition technique for investigating the methanol electro-oxidation (MEO) process in alkaline media. Cyclic voltammetric experiment has revealed that the as-prepared electrode exhibited more than 50% greater stability than those of polycrystalline Pt ((poly) Pt) and Pt/Au electrodes. Moreover, the ratio of forward MEO oxidation peak current and corresponding backward peak current (If/Ib) was found to be greater for Pt/Au-Co than (poly) Pt electrode suggesting substantial resistance of the catalyst for CO adsorption. The XPS analysis has demonstrated that Co existed on the electrode surface as Co(II) oxide which is assumed to enhance the stability of Pt/Au-Co by removing CO species. A relatively smaller Tafel slope (130 mV/dec) was also obtained with Pt/Au-Co than that of commercially available carbon-supported Pt catalyst and, the oxidation process was observed to follow half order kinetics concerning methanol.
Open Research
DATA AVAILABILITY STATEMENT
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Supporting Information
| Filename | Description |
|---|---|
| er8097-sup-0001-Supinfo.docxWord 2007 document , 63 KB | Figure S1. Percentage of current loss after 400 cycles as a function of Au concentration used for Pt/Au and Pt/Au-Co electrodes. Figure S2. CO stripping voltammograms of (poly) Pt and Pt/Au-Co electrode with 0.1 M NaOH at 0.05 V s−1 scan rate at room temperature. |
Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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