Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site
Spinel catalysts have been widely explored for the electrochemical oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). To consolidate the understanding on electrocatalysis by spinel family, intermediate spinels should be deliberately examined because most spinel oxides are of interm...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/141678 |
| _version_ | 1824455011120185344 |
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| author | Zhou, Ye Du, Yonghua Xi, Shibo Xu, Jason Zhichuan |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Zhou, Ye Du, Yonghua Xi, Shibo Xu, Jason Zhichuan |
| author_sort | Zhou, Ye |
| collection | NTU |
| description | Spinel catalysts have been widely explored for the electrochemical oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). To consolidate the understanding on electrocatalysis by spinel family, intermediate spinels should be deliberately examined because most spinel oxides are of intermediate structure. Here, we report an investigation on the ORR and OER performance of intermediate spinel MnFe2O4. The modulation of cation oxidation state and inversion degree of spinel MnFe2O4 were achieved by a simple annealing process. X-ray absorption spectroscopy analysis reveals that the Mn occupancy in octahedral sites varied from 0.25 ~ 0.41 and Mn cations were oxidized from 2+ to 3+ with increasing temperature treatment. Convinced by the leading role of octahedral-geometric, we further reveal the role of Mn oxidation state through normalizing the activity to active Mn[Oh] site number. Our findings clearly indicate that Mn3+ was more catalytically active than Mn2+ in catalyzing ORR and OER. |
| first_indexed | 2025-02-19T03:31:25Z |
| format | Journal Article |
| id | ntu-10356/141678 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:31:25Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1416782021-01-14T08:36:31Z Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site Zhou, Ye Du, Yonghua Xi, Shibo Xu, Jason Zhichuan School of Materials Science and Engineering Solar Fuels Laboratory Energy Research Institute @ NTU (ERI@N) Engineering::Materials Spinel Oxide Manganese Valence Spinel catalysts have been widely explored for the electrochemical oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). To consolidate the understanding on electrocatalysis by spinel family, intermediate spinels should be deliberately examined because most spinel oxides are of intermediate structure. Here, we report an investigation on the ORR and OER performance of intermediate spinel MnFe2O4. The modulation of cation oxidation state and inversion degree of spinel MnFe2O4 were achieved by a simple annealing process. X-ray absorption spectroscopy analysis reveals that the Mn occupancy in octahedral sites varied from 0.25 ~ 0.41 and Mn cations were oxidized from 2+ to 3+ with increasing temperature treatment. Convinced by the leading role of octahedral-geometric, we further reveal the role of Mn oxidation state through normalizing the activity to active Mn[Oh] site number. Our findings clearly indicate that Mn3+ was more catalytically active than Mn2+ in catalyzing ORR and OER. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) 2020-06-10T02:39:49Z 2020-06-10T02:39:49Z 2017 Journal Article Zhou, Y., Du, Y., Xi, S., & Xu, J. Z. (2018). Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site. Electrocatalysis, 9(3), 287-292. doi:10.1007/s12678-017-0429-z 1868-2529 https://hdl.handle.net/10356/141678 10.1007/s12678-017-0429-z 2-s2.0-85044824606 3 9 287 292 en Electrocatalysis © 2017 Springer Science+Business Media, LLC. All rights reserved. |
| spellingShingle | Engineering::Materials Spinel Oxide Manganese Valence Zhou, Ye Du, Yonghua Xi, Shibo Xu, Jason Zhichuan Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site |
| title | Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site |
| title_full | Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site |
| title_fullStr | Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site |
| title_full_unstemmed | Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site |
| title_short | Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site |
| title_sort | spinel manganese ferrites for oxygen electrocatalysis effect of mn valency and occupation site |
| topic | Engineering::Materials Spinel Oxide Manganese Valence |
| url | https://hdl.handle.net/10356/141678 |
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