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    Scientist Reveal New Strategy for CO2 Electrochemical Reduction
    Update time: 2018-08-21
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    Carbon dioxide (CO2) emission has become a global problem that leads to climate change and greenhouse effect to the earth. Hence, efficient conversion of greenhouse gas CO2 into value-added liquid fuels is one of significant ways to fix CO2, and it can alleviate the growing shortage of non-renewable fossil fuels at the same time.

    The electrochemical reduction of CO2 to value-added products obtains great attention and investigation worldwide in recent years owing to its mild reaction conditions and high energy efficiency. However, it remains a challenge to maintain a high current efficiency in a wide negative potential range for achieving a high production rate of the target products.

    Recently, a research team led by Prof. LIU Licheng from Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), Chinese Academy of Sciences (CAS), achieved efficient electrocatalytic conversion of CO2 to formate over a wide negative potential range successfully.

    The researchers developed a new composite catalyst composed of bismuth oxide nanosheets and nitrogen-doped graphene quantum dots (Bi2O3-NGQDs), demonstrating an average current efficiency of 95.6% over a wide negative potential range from -0.9 V to -1.2 V vs. reversible hydrogen electrode. They found that the origin of high activity is the significant synergistic effect among Bi2O3 and NGQDs in increasing adsorption energy of adsorbed CO2 and OCHO* intermediate.

    Furthermore, this study reveals that NGQDs can not only enhance the activity of Bi2O3, but can also enhance the activity of other metal oxides such as SnO2. This work opens up a facile avenue for enhancing activity of some metal oxides in a wide negative potential range.

    The related progresses were published in Angewandte Chemie . This work was supported by the National Natural Science Foundation of China.

    Figure. Schematic illustration of the fabrication process for Bi2O3-NGQDs and the CO2 electrocatalytic reduction process. (Image by CHEN Zhipeng)


    (Text by CHEN Zhipeng)



    CHENG Jing

    Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences

    Tel: 86-532-80662647

    E-mail: chengjing@qibebt.ac.cn

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