Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles
In this study, the efficiency of electrochemical reduction of bicarbonate into formic acid was improved by using a composite electrode made up of tin (Sn), nanodiamond (ND) and carbon nanotube (CNT). In the absence of ND, a compositional ratio of 10/90 (Sn/CNT) demonstrated the highest current densi...
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| Format: | Article |
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Institution of Chemical Engineers
2018
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| author | Hosseini, Soraya kheawhom, Soorathep Masoudi Soltani, Salman Aroua, Mohamed Kheireddine Moghaddas, Houyar Yusoff, Rozita |
| author_facet | Hosseini, Soraya kheawhom, Soorathep Masoudi Soltani, Salman Aroua, Mohamed Kheireddine Moghaddas, Houyar Yusoff, Rozita |
| author_sort | Hosseini, Soraya |
| collection | UM |
| description | In this study, the efficiency of electrochemical reduction of bicarbonate into formic acid was improved by using a composite electrode made up of tin (Sn), nanodiamond (ND) and carbon nanotube (CNT). In the absence of ND, a compositional ratio of 10/90 (Sn/CNT) demonstrated the highest current density. However, by adding ND in a compositional ratio of 10/90/100 (Sn/CNT/ND) the highest efficiency towards formate/formic acid was achieved. It was observed that the presence of ND enhanced the selectivity of product for formic acid. The effects of bicarbonate concentration and scan rate have also been studied to understand the reduction mechanism. The peak potential shifted towards larger negative values of applied potential with an increase in the scan rate from 0.01 to 0.1 V/s, confirming the irreversible nature of the reduction process. The linear relationship between the current and the square root of the scan rate (with a slope value of 0.519) suggested that the reaction process is fully diffusion-controlled. Formic acid was produced using both electrodes; however, the electrode containing nano-diamond successfully improved the process yield for formic acid. Electrochemical impedance study revealed a significant difference between Warburg coefficient for oxidation and reduction processes with values of 29.63 × 1012 and 67.4 Ω. S−0.5 for the applied potentials of 0.5 V and −0.4 V, respectively. This difference confirmed a low resistance at the electrode/electrolyte interface for the reduction potentials. |
| first_indexed | 2024-03-06T05:55:20Z |
| format | Article |
| id | um.eprints-21864 |
| institution | Universiti Malaya |
| last_indexed | 2024-03-06T05:55:20Z |
| publishDate | 2018 |
| publisher | Institution of Chemical Engineers |
| record_format | dspace |
| spelling | um.eprints-218642019-08-07T06:57:56Z http://eprints.um.edu.my/21864/ Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles Hosseini, Soraya kheawhom, Soorathep Masoudi Soltani, Salman Aroua, Mohamed Kheireddine Moghaddas, Houyar Yusoff, Rozita TP Chemical technology In this study, the efficiency of electrochemical reduction of bicarbonate into formic acid was improved by using a composite electrode made up of tin (Sn), nanodiamond (ND) and carbon nanotube (CNT). In the absence of ND, a compositional ratio of 10/90 (Sn/CNT) demonstrated the highest current density. However, by adding ND in a compositional ratio of 10/90/100 (Sn/CNT/ND) the highest efficiency towards formate/formic acid was achieved. It was observed that the presence of ND enhanced the selectivity of product for formic acid. The effects of bicarbonate concentration and scan rate have also been studied to understand the reduction mechanism. The peak potential shifted towards larger negative values of applied potential with an increase in the scan rate from 0.01 to 0.1 V/s, confirming the irreversible nature of the reduction process. The linear relationship between the current and the square root of the scan rate (with a slope value of 0.519) suggested that the reaction process is fully diffusion-controlled. Formic acid was produced using both electrodes; however, the electrode containing nano-diamond successfully improved the process yield for formic acid. Electrochemical impedance study revealed a significant difference between Warburg coefficient for oxidation and reduction processes with values of 29.63 × 1012 and 67.4 Ω. S−0.5 for the applied potentials of 0.5 V and −0.4 V, respectively. This difference confirmed a low resistance at the electrode/electrolyte interface for the reduction potentials. Institution of Chemical Engineers 2018 Article PeerReviewed Hosseini, Soraya and kheawhom, Soorathep and Masoudi Soltani, Salman and Aroua, Mohamed Kheireddine and Moghaddas, Houyar and Yusoff, Rozita (2018) Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles. Process Safety and Environmental Protection, 116. pp. 494-505. ISSN 0957-5820, DOI https://doi.org/10.1016/j.psep.2018.03.005 <https://doi.org/10.1016/j.psep.2018.03.005>. https://doi.org/10.1016/j.psep.2018.03.005 doi:10.1016/j.psep.2018.03.005 |
| spellingShingle | TP Chemical technology Hosseini, Soraya kheawhom, Soorathep Masoudi Soltani, Salman Aroua, Mohamed Kheireddine Moghaddas, Houyar Yusoff, Rozita Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles |
| title | Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles |
| title_full | Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles |
| title_fullStr | Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles |
| title_full_unstemmed | Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles |
| title_short | Improvement of product selectivity in bicarbonate reduction into formic acid on a tin-based catalyst by integrating nano-diamond particles |
| title_sort | improvement of product selectivity in bicarbonate reduction into formic acid on a tin based catalyst by integrating nano diamond particles |
| topic | TP Chemical technology |
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