循環電化學應用於高選擇性之二氧化碳還原反應

邱士芸

doi:10.6342/NTU201702811

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循環電化學應用於高選擇性之二氧化碳還原反應

High selectivity of CO2 reduction through electrochemical redox shuttle

邱士芸 , Masters　　Advisor：陳浩銘　　

繁體中文 DOI： 10.6342/NTU201702811

二氧化碳還原；選擇性；氧化銅；循環電化學； CO2 reduction ； selectivity ； copper oxide ； electrochemical redox shuttle

Abstract │ Reference (84) │ Altmetrics

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The amount of CO2 emissions has increased dramatically in the past few decades. Finding a method which can effectively reduce CO2 to fuel can be a promising solution to this huge emission of CO2. Nowadays, electrochemistry has been proven to be a powerful way to reduce CO2. However, the selectivity of CO2 reduction products is low. Extra energy is needed to purify different products. Therefore, choosing the suitable catalyst for CO2 reduction is the priority in this field. In this work, copper oxide (CuOx) was used as our catalyst due to its high production of ethanol at low potential. Along with the morphology of the cage, the active surface area of CO2 reduction increases dramatically. Then, we came up with an electrochemical redox shuttle method to stabilize the oxidation state of our CuOx material. By using this method, high conversion of CO2 into ethanol at low potential was achieved.
With gas chromatography–mass spectrometry analysis, ethanol is the major product in liquid phase, whereas hydrogen is the byproduct. This study shows that hydrogen evolution decreases dramatically when applying the electrochemical redox shuttle method instead of the constant potential method. In addition, the composition of CuOx material was confirmed by in situ XANES and in situ X–ray diffraction measurement. This information proves that the electrochemical redox shuttle method not only stabilizes the catalyst not to form pure copper, but also improves the selectivity of ethanol. Thus, we predict that oxygen on catalyst plays an important role on CO2 reduction, which allows ethanol formation at low potential.
In conclusion, we provided a novel method to prevent the material itself from being reduced and thus maintain its performance, which could lead to potential applications of other oxidative catalysts.

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