Eggshell membrane-derived metal sulfide catalysts for seawater splitting
To replace depleting freshwater resources, seawater, with its abundance and economy, has become a more favourable option for water electrolysis. However, seawater electrolysis necessitates electrocatalysts with excellent activity as well as resistance to Cl− corrosion. Herein, we utilized a biowaste...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Online Access: | https://hdl.handle.net/10356/179518 |
| _version_ | 1826120143802990592 |
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| author | Cui, Lingyu Zhang, Lan Shen, Yi |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Cui, Lingyu Zhang, Lan Shen, Yi |
| author_sort | Cui, Lingyu |
| collection | NTU |
| description | To replace depleting freshwater resources, seawater, with its abundance and economy, has become a more favourable option for water electrolysis. However, seawater electrolysis necessitates electrocatalysts with excellent activity as well as resistance to Cl− corrosion. Herein, we utilized a biowaste, eggshell membranes, as a versatile platform to fabricate sulfide electrocatalysts for the oxygen revolution reaction (OER). Structural analyses including X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy tests indicated that the introduction of iron into the cobalt sulfide lattice greatly modified the structures of the sulfide. Electrochemical tests and operando electrochemical Raman spectroscopy showed that the introduction of Fe adjusted the electronic structure of Co9S8, facilitating the formation of Co4+ species, which serve as the major active sites for OER, thereby effectively improving the catalyst performance. The optimal Co8FeS8/ESM-900 sample can achieve a current density of 10 mA cm−2 in alkaline freshwater, simulated seawater, and natural seawater at overpotentials of 270, 271, and 324 mV, respectively, which are lower than the overpotentials of 273, 272, and 337 mV obtained from IrO2. The sulphate passivation layer formed during the OER process can effectively repel Cl−, leading to outstanding corrosion resistance. The Co8FeS8/ESM-900 catalyst can be continuously operated in seawater electrolysis for 200 000 s. A (−)Pt/C||Co8FeS8/ESM-900(+) electrolyzer required only 1.629, 1.623, and 1.648 V to yield a current density of 10 mA cm−2 for the electrolysis of alkaline freshwater, simulated seawater, and natural seawater, respectively, which are superior to the performance of the (−)Pt/C||IrO2(+) electrolyzer. In virtue of its low cost, high efficiency and outstanding stability, the catalyst reported in this study is promising in practical seawater electrolysis. |
| first_indexed | 2024-10-01T05:11:23Z |
| format | Journal Article |
| id | ntu-10356/179518 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:11:23Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1795182024-08-06T07:29:34Z Eggshell membrane-derived metal sulfide catalysts for seawater splitting Cui, Lingyu Zhang, Lan Shen, Yi School of Mechanical and Aerospace Engineering Energy Research Institute @ NTU (ERI@N) Engineering Eggshell membranes Metal sulfides To replace depleting freshwater resources, seawater, with its abundance and economy, has become a more favourable option for water electrolysis. However, seawater electrolysis necessitates electrocatalysts with excellent activity as well as resistance to Cl− corrosion. Herein, we utilized a biowaste, eggshell membranes, as a versatile platform to fabricate sulfide electrocatalysts for the oxygen revolution reaction (OER). Structural analyses including X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy tests indicated that the introduction of iron into the cobalt sulfide lattice greatly modified the structures of the sulfide. Electrochemical tests and operando electrochemical Raman spectroscopy showed that the introduction of Fe adjusted the electronic structure of Co9S8, facilitating the formation of Co4+ species, which serve as the major active sites for OER, thereby effectively improving the catalyst performance. The optimal Co8FeS8/ESM-900 sample can achieve a current density of 10 mA cm−2 in alkaline freshwater, simulated seawater, and natural seawater at overpotentials of 270, 271, and 324 mV, respectively, which are lower than the overpotentials of 273, 272, and 337 mV obtained from IrO2. The sulphate passivation layer formed during the OER process can effectively repel Cl−, leading to outstanding corrosion resistance. The Co8FeS8/ESM-900 catalyst can be continuously operated in seawater electrolysis for 200 000 s. A (−)Pt/C||Co8FeS8/ESM-900(+) electrolyzer required only 1.629, 1.623, and 1.648 V to yield a current density of 10 mA cm−2 for the electrolysis of alkaline freshwater, simulated seawater, and natural seawater, respectively, which are superior to the performance of the (−)Pt/C||IrO2(+) electrolyzer. In virtue of its low cost, high efficiency and outstanding stability, the catalyst reported in this study is promising in practical seawater electrolysis. The project was financially supported by the Fundamental Research Funds for the Central Universities (2023ZYGXZR092), the National Natural Science Foundation of China (22279035), and a research grant (204-A021001) from the China-Singapore International Joint Research Institute. 2024-08-06T07:29:33Z 2024-08-06T07:29:33Z 2024 Journal Article Cui, L., Zhang, L. & Shen, Y. (2024). Eggshell membrane-derived metal sulfide catalysts for seawater splitting. Green Chemistry, 26(13), 7879-7890. https://dx.doi.org/10.1039/d4gc02017k 1463-9262 https://hdl.handle.net/10356/179518 10.1039/d4gc02017k 2-s2.0-85195873500 13 26 7879 7890 en Green Chemistry © 2024 The Author(s). All rights reserved. |
| spellingShingle | Engineering Eggshell membranes Metal sulfides Cui, Lingyu Zhang, Lan Shen, Yi Eggshell membrane-derived metal sulfide catalysts for seawater splitting |
| title | Eggshell membrane-derived metal sulfide catalysts for seawater splitting |
| title_full | Eggshell membrane-derived metal sulfide catalysts for seawater splitting |
| title_fullStr | Eggshell membrane-derived metal sulfide catalysts for seawater splitting |
| title_full_unstemmed | Eggshell membrane-derived metal sulfide catalysts for seawater splitting |
| title_short | Eggshell membrane-derived metal sulfide catalysts for seawater splitting |
| title_sort | eggshell membrane derived metal sulfide catalysts for seawater splitting |
| topic | Engineering Eggshell membranes Metal sulfides |
| url | https://hdl.handle.net/10356/179518 |
| work_keys_str_mv | AT cuilingyu eggshellmembranederivedmetalsulfidecatalystsforseawatersplitting AT zhanglan eggshellmembranederivedmetalsulfidecatalystsforseawatersplitting AT shenyi eggshellmembranederivedmetalsulfidecatalystsforseawatersplitting |