The reporter recently learned from the University of Science and Technology of China that the team of Professor Zeng Jie of the School of Chemistry and Materials Science and the National Research Center for Microscale Material Science of Hefei University used tin disulfide nanosheets doped with different nickel content as catalysts to achieve efficient electroreduction Carbon dioxide to formic acid and carbon monoxide. This nickel-doped tin disulfide nanosheet catalyst exhibits high activity and high stability in the carbon dioxide electroreduction reaction. The result was recently published in the "German Applied Chemistry" magazine.
In the carbon dioxide electroreduction reaction, the activation of carbon dioxide molecules has always been the research difficulty of carbon dioxide electrocatalytic reduction reaction. Because, under standard conditions, the standard electrode potential required for the activation of carbon dioxide molecules into carbon dioxide anions in an aqueous solution is -1.9 relative to standard hydrogen. Generally, the activation of carbon dioxide molecules involves the transfer of electrons from the catalyst to the carbon dioxide molecules, and this process is closely related to the electronic structure of the catalyst. Therefore, the carbon dioxide molecule can be efficiently activated by adjusting the electronic structure of the catalyst.
Based on this concept, the researchers obtained tin-disulfide nanosheet catalysts with different nickel doping by adjusting the content of nickel introduced based on two-layer atomic thick tin disulfide nanosheets. The tin disulfide nanosheet catalyst with appropriate nickel content achieves efficient activation of carbon dioxide molecules, thereby enhancing the performance of carbon dioxide electrocatalytic reduction. In the electrocatalytic reduction of carbon dioxide, the Faraday efficiency of reducing 5% nickel-doped tin disulfide nanosheets to an effective carbon product at a voltage of -0.9 standard hydrogen potential is as high as 93%.
This work not only prepared highly efficient nickel-doped tin disulfide nanosheets as carbon dioxide electroreduction catalysts, but also provided a method for rational design of electrocatalysts. (Reporter Wu Changfeng)
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