A tungsten polyoxometalate mediated aqueous redox flow battery with high open-circuit voltage up to 2 V
Abstract As a promising stationary energy storage device, aqueous redox flow battery (ARFB) still faces the challenge of low open-circuit voltage, due to the limitation of the potential of water splitting (1.23 V theoretically). Herein, we present a low potential anolyte design by using Na substitut...
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Nature Portfolio
2025-05-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-60018-7 |
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| author | Weipeng Li Weizhuo Xu Zhaopeng Sun Linning Tang Guohao Xu Xinyue He Yulin Deng Wei Sun Bingjie Zhou Jianfei Song Wei Liu |
| author_facet | Weipeng Li Weizhuo Xu Zhaopeng Sun Linning Tang Guohao Xu Xinyue He Yulin Deng Wei Sun Bingjie Zhou Jianfei Song Wei Liu |
| author_sort | Weipeng Li |
| collection | DOAJ |
| description | Abstract As a promising stationary energy storage device, aqueous redox flow battery (ARFB) still faces the challenge of low open-circuit voltage, due to the limitation of the potential of water splitting (1.23 V theoretically). Herein, we present a low potential anolyte design by using Na substituted phosphotungstic acid (3Na-PW12) for an aqueous redox flow battery with the high open-circuit voltage up to 2.0 V. The 3Na-PW12 can store 5 electrons in the charging process and simultaneously capture Na+ or protons from the dissociation of water, resulting in the increase of electrolyte pH to 11. Because of the high pH value, the hydrogen evolution reaction (HER) is highly suppressed, and the 3Na-PW12 is partially degraded into a lacunary structured PW11 with extremely low potential down to −1.1 V (vs. SHE). After discharging, the captured protons are re-released into the solution, therefore, pH and the structure of 3Na-PW12 are recovered. Based on the cyclic pH change and self-regulation process of 3Na-PW12 in the charge and discharge process, the aqueous flow battery offered a high-power density of 200 mW cm−2 and 160 mW cm−2 coupled with Br2/Br− and I2/I− catholyte respectively. |
| format | Article |
| id | doaj-art-904d23b597da47ff9914f7959f3fee85 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-904d23b597da47ff9914f7959f3fee852025-08-20T03:48:18ZengNature PortfolioNature Communications2041-17232025-05-0116111010.1038/s41467-025-60018-7A tungsten polyoxometalate mediated aqueous redox flow battery with high open-circuit voltage up to 2 VWeipeng Li0Weizhuo Xu1Zhaopeng Sun2Linning Tang3Guohao Xu4Xinyue He5Yulin Deng6Wei Sun7Bingjie Zhou8Jianfei Song9Wei Liu10School of Chemistry and Chemical Engineering, Central South UniversitySchool of Chemistry and Chemical Engineering, Central South UniversitySchool of Chemistry and Chemical Engineering, Central South UniversitySchool of Chemistry and Chemical Engineering, Central South UniversitySchool of Chemistry and Chemical Engineering, Central South UniversitySchool of Chemistry and Chemical Engineering, Central South UniversitySchool of Chemical & Biomolecular Engineering and RBI at Georgia Tech, Georgia Institute of TechnologySchool of Chemistry and Chemical Engineering, Shihezi UniversityNational Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co. Ltd.Changsha New Energy Innovation InstituteSchool of Chemistry and Chemical Engineering, Central South UniversityAbstract As a promising stationary energy storage device, aqueous redox flow battery (ARFB) still faces the challenge of low open-circuit voltage, due to the limitation of the potential of water splitting (1.23 V theoretically). Herein, we present a low potential anolyte design by using Na substituted phosphotungstic acid (3Na-PW12) for an aqueous redox flow battery with the high open-circuit voltage up to 2.0 V. The 3Na-PW12 can store 5 electrons in the charging process and simultaneously capture Na+ or protons from the dissociation of water, resulting in the increase of electrolyte pH to 11. Because of the high pH value, the hydrogen evolution reaction (HER) is highly suppressed, and the 3Na-PW12 is partially degraded into a lacunary structured PW11 with extremely low potential down to −1.1 V (vs. SHE). After discharging, the captured protons are re-released into the solution, therefore, pH and the structure of 3Na-PW12 are recovered. Based on the cyclic pH change and self-regulation process of 3Na-PW12 in the charge and discharge process, the aqueous flow battery offered a high-power density of 200 mW cm−2 and 160 mW cm−2 coupled with Br2/Br− and I2/I− catholyte respectively.https://doi.org/10.1038/s41467-025-60018-7 |
| spellingShingle | Weipeng Li Weizhuo Xu Zhaopeng Sun Linning Tang Guohao Xu Xinyue He Yulin Deng Wei Sun Bingjie Zhou Jianfei Song Wei Liu A tungsten polyoxometalate mediated aqueous redox flow battery with high open-circuit voltage up to 2 V Nature Communications |
| title | A tungsten polyoxometalate mediated aqueous redox flow battery with high open-circuit voltage up to 2 V |
| title_full | A tungsten polyoxometalate mediated aqueous redox flow battery with high open-circuit voltage up to 2 V |
| title_fullStr | A tungsten polyoxometalate mediated aqueous redox flow battery with high open-circuit voltage up to 2 V |
| title_full_unstemmed | A tungsten polyoxometalate mediated aqueous redox flow battery with high open-circuit voltage up to 2 V |
| title_short | A tungsten polyoxometalate mediated aqueous redox flow battery with high open-circuit voltage up to 2 V |
| title_sort | tungsten polyoxometalate mediated aqueous redox flow battery with high open circuit voltage up to 2 v |
| url | https://doi.org/10.1038/s41467-025-60018-7 |
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