High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide
In this work, we present Co3O4 quantum dots (QDs) as a highly efficient and stable oxygen evolution reaction (OER) catalyst at neutral pH. The Co3O4 QDs with a mean size of 5 nm were synthesized by reacting cobalt acetate with benzyl alcohol in the presence of ammonia under reflux conditions. The as...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/142457 |
| _version_ | 1826117069984235520 |
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| author | Ma, Lin Hung, Sung-Fu Zhang, Liping Cai, Weizheng Yang, Hongbin Chen, Hao Ming Liu, Bin |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Ma, Lin Hung, Sung-Fu Zhang, Liping Cai, Weizheng Yang, Hongbin Chen, Hao Ming Liu, Bin |
| author_sort | Ma, Lin |
| collection | NTU |
| description | In this work, we present Co3O4 quantum dots (QDs) as a highly efficient and stable oxygen evolution reaction (OER) catalyst at neutral pH. The Co3O4 QDs with a mean size of 5 nm were synthesized by reacting cobalt acetate with benzyl alcohol in the presence of ammonia under reflux conditions. The as-synthesized Co3O4 QDs show extraordinary water oxidation activity with onset overpotential as low as 398 mV and mass activity as high as 567 A/g (at 1.75 V vs RHE) in a 0.2 M phosphate buffer electrolyte (pH ∼7), which are among the most efficient Earth-abundant OER catalysts at neutral pH reported in the literature, reaching a stable current density of 10 mA/cm2 at an overpotential of ∼490 mV with a Tafel slope of 80 mV/decade. Through in-depth investigations by X-ray photoelectron spectroscopy and X-ray absorption spectroscopy, the high spin Co2+ and Co3+ cations on the surface of Co3O4 QDs were found to be important to promote the OER kinetics at neutral pH. |
| first_indexed | 2024-10-01T04:21:44Z |
| format | Journal Article |
| id | ntu-10356/142457 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:21:44Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1424572020-06-22T06:59:28Z High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide Ma, Lin Hung, Sung-Fu Zhang, Liping Cai, Weizheng Yang, Hongbin Chen, Hao Ming Liu, Bin School of Chemical and Biomedical Engineering Engineering::Chemical technology Quantum Dots (QDs) Water Oxidation Catalysis In this work, we present Co3O4 quantum dots (QDs) as a highly efficient and stable oxygen evolution reaction (OER) catalyst at neutral pH. The Co3O4 QDs with a mean size of 5 nm were synthesized by reacting cobalt acetate with benzyl alcohol in the presence of ammonia under reflux conditions. The as-synthesized Co3O4 QDs show extraordinary water oxidation activity with onset overpotential as low as 398 mV and mass activity as high as 567 A/g (at 1.75 V vs RHE) in a 0.2 M phosphate buffer electrolyte (pH ∼7), which are among the most efficient Earth-abundant OER catalysts at neutral pH reported in the literature, reaching a stable current density of 10 mA/cm2 at an overpotential of ∼490 mV with a Tafel slope of 80 mV/decade. Through in-depth investigations by X-ray photoelectron spectroscopy and X-ray absorption spectroscopy, the high spin Co2+ and Co3+ cations on the surface of Co3O4 QDs were found to be important to promote the OER kinetics at neutral pH. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) 2020-06-22T06:59:27Z 2020-06-22T06:59:27Z 2018 Journal Article Ma, L., Hung, S.-F., Zhang, L., Cai, W., Yang, H., Chen, H. M., & Liu, B. (2018). High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide. Industrial & Engineering Chemistry Research, 57(5), 1441-1445. doi:10.1021/acs.iecr.7b04812 0888-5885 https://hdl.handle.net/10356/142457 10.1021/acs.iecr.7b04812 2-s2.0-85042058880 5 57 1441 1445 en Industrial & Engineering Chemistry Research © 2018 American Chemical Society. All rights reserved. |
| spellingShingle | Engineering::Chemical technology Quantum Dots (QDs) Water Oxidation Catalysis Ma, Lin Hung, Sung-Fu Zhang, Liping Cai, Weizheng Yang, Hongbin Chen, Hao Ming Liu, Bin High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide |
| title | High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide |
| title_full | High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide |
| title_fullStr | High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide |
| title_full_unstemmed | High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide |
| title_short | High spin state promotes water oxidation catalysis at neutral pH in spinel cobalt oxide |
| title_sort | high spin state promotes water oxidation catalysis at neutral ph in spinel cobalt oxide |
| topic | Engineering::Chemical technology Quantum Dots (QDs) Water Oxidation Catalysis |
| url | https://hdl.handle.net/10356/142457 |
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