Tailoring Borate Mediator Species Enables Industrial CO Production with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 Electrolysis
Abstract The electrochemical conversion of CO2 into CO represents a promising strategy for mitigating excessive global greenhouse gas emissions. Nevertheless, achieving industrial‐scale electrochemical CO2‐to‐CO conversion with enhanced selectivity and reduced energy consumption presents significant...
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Wiley
2025-01-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202406457 |
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| author | Xinyu Li Bowen Deng Kaifa Du Wenmiao Li Di Chen Xin Qu Fangzhao Pang Xiaodan Zhang Hao Zha Huayi Yin Dihua Wang |
| author_facet | Xinyu Li Bowen Deng Kaifa Du Wenmiao Li Di Chen Xin Qu Fangzhao Pang Xiaodan Zhang Hao Zha Huayi Yin Dihua Wang |
| author_sort | Xinyu Li |
| collection | DOAJ |
| description | Abstract The electrochemical conversion of CO2 into CO represents a promising strategy for mitigating excessive global greenhouse gas emissions. Nevertheless, achieving industrial‐scale electrochemical CO2‐to‐CO conversion with enhanced selectivity and reduced energy consumption presents significant challenges. In this study, a borate‐enhanced molten salt process for CO2 capture and electrochemical transformation is employed, achieving over 98% selectivity for CO and over 55% energy efficiency without the necessity for complex and costly electrocatalysts. Cathodic CO2 electro‐reduction (CO2ER) with the anodic oxygen evolution reaction (OER) at an overall current density of 500 mA cm−2 using non‐nanostructured transition‐metal plate electrodes at 650 °C is coupled. By regulating the electrolyte's oxo‐basicity with earth‐abundant borax (Na2B4O7), a borate‐enhanced electrolyte is established that accelerates the overall electrochemical reaction efficiently. This system involved a series of well‐designed target borate species (BO33−, BO2−, and B4O72−) that acted as mediators shuttling between the cathode and anode, favoring CO as the primary cathodic product. Manipulating the atmosphere above the anode facilitated a spontaneous transformation of borates, further enhancing OER performance with long‐term operational stability over a cumulative period of 50 h, while also reducing overall energy consumption. This work presents a cost‐effective strategy for the industrial‐scale production of CO derived from CO2, contributing to a lower carbon footprint by establishing a sustainable borate‐mediated closed loop. |
| format | Article |
| id | doaj-art-1b3519fcc0504a8682f1fe9800ac5f23 |
| institution | Kabale University |
| issn | 2198-3844 |
| language | English |
| publishDate | 2025-01-01 |
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| series | Advanced Science |
| spelling | doaj-art-1b3519fcc0504a8682f1fe9800ac5f232025-01-29T09:50:19ZengWileyAdvanced Science2198-38442025-01-01124n/an/a10.1002/advs.202406457Tailoring Borate Mediator Species Enables Industrial CO Production with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 ElectrolysisXinyu Li0Bowen Deng1Kaifa Du2Wenmiao Li3Di Chen4Xin Qu5Fangzhao Pang6Xiaodan Zhang7Hao Zha8Huayi Yin9Dihua Wang10School of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaSchool of Resource and Environmental Science Wuhan University Wuhan 430072 P. R. ChinaAbstract The electrochemical conversion of CO2 into CO represents a promising strategy for mitigating excessive global greenhouse gas emissions. Nevertheless, achieving industrial‐scale electrochemical CO2‐to‐CO conversion with enhanced selectivity and reduced energy consumption presents significant challenges. In this study, a borate‐enhanced molten salt process for CO2 capture and electrochemical transformation is employed, achieving over 98% selectivity for CO and over 55% energy efficiency without the necessity for complex and costly electrocatalysts. Cathodic CO2 electro‐reduction (CO2ER) with the anodic oxygen evolution reaction (OER) at an overall current density of 500 mA cm−2 using non‐nanostructured transition‐metal plate electrodes at 650 °C is coupled. By regulating the electrolyte's oxo‐basicity with earth‐abundant borax (Na2B4O7), a borate‐enhanced electrolyte is established that accelerates the overall electrochemical reaction efficiently. This system involved a series of well‐designed target borate species (BO33−, BO2−, and B4O72−) that acted as mediators shuttling between the cathode and anode, favoring CO as the primary cathodic product. Manipulating the atmosphere above the anode facilitated a spontaneous transformation of borates, further enhancing OER performance with long‐term operational stability over a cumulative period of 50 h, while also reducing overall energy consumption. This work presents a cost‐effective strategy for the industrial‐scale production of CO derived from CO2, contributing to a lower carbon footprint by establishing a sustainable borate‐mediated closed loop.https://doi.org/10.1002/advs.202406457CO productionelectrochemical CO2 reductionelectrode processesmolten salt electrolysisoxygen evolution reactionreaction kinetics |
| spellingShingle | Xinyu Li Bowen Deng Kaifa Du Wenmiao Li Di Chen Xin Qu Fangzhao Pang Xiaodan Zhang Hao Zha Huayi Yin Dihua Wang Tailoring Borate Mediator Species Enables Industrial CO Production with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 Electrolysis Advanced Science CO production electrochemical CO2 reduction electrode processes molten salt electrolysis oxygen evolution reaction reaction kinetics |
| title | Tailoring Borate Mediator Species Enables Industrial CO Production with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 Electrolysis |
| title_full | Tailoring Borate Mediator Species Enables Industrial CO Production with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 Electrolysis |
| title_fullStr | Tailoring Borate Mediator Species Enables Industrial CO Production with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 Electrolysis |
| title_full_unstemmed | Tailoring Borate Mediator Species Enables Industrial CO Production with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 Electrolysis |
| title_short | Tailoring Borate Mediator Species Enables Industrial CO Production with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 Electrolysis |
| title_sort | tailoring borate mediator species enables industrial co production with improved overall energy efficiency by sustainable molten salt co2 electrolysis |
| topic | CO production electrochemical CO2 reduction electrode processes molten salt electrolysis oxygen evolution reaction reaction kinetics |
| url | https://doi.org/10.1002/advs.202406457 |
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