Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media
An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances o...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI
2020
|
| Subjects: | |
| Online Access: | http://eprints.utm.my/93822/1/JuhanaJaafar2020_CatalyticEvaluationofNanoflowerStructuredManganeseOxide.pdf |
| _version_ | 1796865700088774656 |
|---|---|
| author | Han, Siow Jing Ameen, Mariam Hanifah, Mohamad Fahrul Radzi Aqsha, Aqsha Bilad, Muhammad Roil Jaafar, Juhana Kheawhom, Soorathep |
| author_facet | Han, Siow Jing Ameen, Mariam Hanifah, Mohamad Fahrul Radzi Aqsha, Aqsha Bilad, Muhammad Roil Jaafar, Juhana Kheawhom, Soorathep |
| author_sort | Han, Siow Jing |
| collection | ePrints |
| description | An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances of nanoflower structure MnO2 for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a zinc–air battery as a bifunctional electrocatalyst. The prepared catalyst was characterized in term of morphology, crystallinity, and total surface area. Cyclic voltammetry and linear sweep voltammetry were used to evaluate the electrochemical behaviors of the as-prepared nanoflower-like MnO2. The discharge performance test for zinc–air battery with a MnO2 catalyst was also conducted. The results show that the MnO2 prepared at dwell times of 2, 4 and 6 h were nanoflowers, nanoflower mixed with nanowires, and nanowires with corresponding specific surface areas of 52.4, 34.9 and 32.4 g/cm2, respectively. The nanoflower-like MnO2 catalyst exhibits a better electrocatalytic performance towards both ORR and OER compared to the nanowires. The number of electrons transferred for the MnO2 with nanoflower, nanoflower mixed with nanowires, and nanowire structures is 3.68, 3.31 and 3.00, respectively. The as-prepared MnO2 nanoflower-like structure exhibits the best discharge performance of 31% higher than the nanowires and reaches up to 30% of the theoretical discharge capacity of the zinc–air battery. |
| first_indexed | 2024-03-05T21:01:03Z |
| format | Article |
| id | utm.eprints-93822 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T21:01:03Z |
| publishDate | 2020 |
| publisher | MDPI |
| record_format | dspace |
| spelling | utm.eprints-938222022-01-31T08:37:15Z http://eprints.utm.my/93822/ Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media Han, Siow Jing Ameen, Mariam Hanifah, Mohamad Fahrul Radzi Aqsha, Aqsha Bilad, Muhammad Roil Jaafar, Juhana Kheawhom, Soorathep TP Chemical technology An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances of nanoflower structure MnO2 for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a zinc–air battery as a bifunctional electrocatalyst. The prepared catalyst was characterized in term of morphology, crystallinity, and total surface area. Cyclic voltammetry and linear sweep voltammetry were used to evaluate the electrochemical behaviors of the as-prepared nanoflower-like MnO2. The discharge performance test for zinc–air battery with a MnO2 catalyst was also conducted. The results show that the MnO2 prepared at dwell times of 2, 4 and 6 h were nanoflowers, nanoflower mixed with nanowires, and nanowires with corresponding specific surface areas of 52.4, 34.9 and 32.4 g/cm2, respectively. The nanoflower-like MnO2 catalyst exhibits a better electrocatalytic performance towards both ORR and OER compared to the nanowires. The number of electrons transferred for the MnO2 with nanoflower, nanoflower mixed with nanowires, and nanowire structures is 3.68, 3.31 and 3.00, respectively. The as-prepared MnO2 nanoflower-like structure exhibits the best discharge performance of 31% higher than the nanowires and reaches up to 30% of the theoretical discharge capacity of the zinc–air battery. MDPI 2020 Article PeerReviewed application/pdf en http://eprints.utm.my/93822/1/JuhanaJaafar2020_CatalyticEvaluationofNanoflowerStructuredManganeseOxide.pdf Han, Siow Jing and Ameen, Mariam and Hanifah, Mohamad Fahrul Radzi and Aqsha, Aqsha and Bilad, Muhammad Roil and Jaafar, Juhana and Kheawhom, Soorathep (2020) Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media. Catalysts, 10 (8). pp. 1-14. ISSN 2073-4344 http://dx.doi.org/10.3390/catal10080822 |
| spellingShingle | TP Chemical technology Han, Siow Jing Ameen, Mariam Hanifah, Mohamad Fahrul Radzi Aqsha, Aqsha Bilad, Muhammad Roil Jaafar, Juhana Kheawhom, Soorathep Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media |
| title | Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media |
| title_full | Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media |
| title_fullStr | Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media |
| title_full_unstemmed | Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media |
| title_short | Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media |
| title_sort | catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media |
| topic | TP Chemical technology |
| url | http://eprints.utm.my/93822/1/JuhanaJaafar2020_CatalyticEvaluationofNanoflowerStructuredManganeseOxide.pdf |
| work_keys_str_mv | AT hansiowjing catalyticevaluationofnanoflowerstructuredmanganeseoxideelectrocatalystforoxygenreductioninalkalinemedia AT ameenmariam catalyticevaluationofnanoflowerstructuredmanganeseoxideelectrocatalystforoxygenreductioninalkalinemedia AT hanifahmohamadfahrulradzi catalyticevaluationofnanoflowerstructuredmanganeseoxideelectrocatalystforoxygenreductioninalkalinemedia AT aqshaaqsha catalyticevaluationofnanoflowerstructuredmanganeseoxideelectrocatalystforoxygenreductioninalkalinemedia AT biladmuhammadroil catalyticevaluationofnanoflowerstructuredmanganeseoxideelectrocatalystforoxygenreductioninalkalinemedia AT jaafarjuhana catalyticevaluationofnanoflowerstructuredmanganeseoxideelectrocatalystforoxygenreductioninalkalinemedia AT kheawhomsoorathep catalyticevaluationofnanoflowerstructuredmanganeseoxideelectrocatalystforoxygenreductioninalkalinemedia |