銅和釕共摻雜石墨型氮化碳電催化還原CO2

近年來由於溫室效應以及能源危機等議題對於人類的生活影響範圍越來越大，對於著手開發新興再生能源的研究也越來越多、研究範圍也越來越廣。其中對於開發二氧化碳為可再生能源的研究也日益增加，因此研究相關材料能有效催化二氧化碳還原反應並且提高效率被視為此研究領域重要的目的。通過電化學還原將二氧化碳轉化為碳基燃料是一種很有前景的方法，可以在存儲可再生電力的能量的同時實現碳循環的終止。然而，目前的電催化劑對乙醇的選擇性有限。而本研究以報告了一種銅和釕共摻雜的石墨氮化碳催化劑，在 XPS 和 EDS 元素分析中，證實銅和釕成功地摻雜到石墨氮化碳中，該催化劑對電化學二氧化碳還原反應中(CO2RR) 形成碳，並在飽和的二氧化碳下，當電解液為0.1M KHCO3時表現出有較好的活性。樣品 CuRu0.5DCN 在線性掃描伏安法中，在 -1.1 V 下獲得了飽和電流密度，這歸因於電催化過程中優異的穩定性。最後透過計時電流法(CA)，在-1.2V (vs. RHE )並測試2000秒中，說明CuRu0.5DCN在電化學還原二氧化碳過程中具有出色的長期穩定性。CuRu0.5DCN是具有比DCN更低的過電位。為了進一步檢查材料的催化效率，記錄Tafel斜率， CuRu0.5DCN 的電流密度最小，有利於催化效率。

關鍵字

電催化；二氧化碳還原

並列摘要

In recent years, due to the profound influences of Greenhouse and energy crisis, more researches of discovering renewable energy are increasing and become extensive. Among them developing carbon dioxide reduction reaction is the most crucial part. As a result, making the research into substrates, which catalyze of carbon dioxide reduction reaction and promote the efficiency, is regarded as main purpose. The conversion of CO2 into carbon-based fuels via electrochemical reduction is a promising approach to realizing the termination of carbon cycling while storing energy from renewable electricity. However, current electrocatalysts offer only limited selectivity toward ethanol. Here we report a copper and ruthenium co-doping graphitic carbon nitride catalyst, In XPS and EDS elemental analysis, it was confirmed that copper and ruthenium were successfully doped in graphitic carbon nitride which exhibited attractive activity towards electrochemical CO2 reduction reaction (CO2RR) forming carbon product in 0.1 M KHCO3 aqueous media. The sample CuRu0.5DCN obtained a saturation current density at -1.1 V in linear sweep voltammetry, which was attributed to the excellent stability during the electrocatalytic process. Finally, through the chronoamperometry (CA), in -1.2V (vs. RHE) and tested for 2000 seconds, it shows that CuRu0.5DCN has excellent long-term stability during the electrochemical reduction of carbon dioxide. CuRu0.5DCN has a lower overpotential than DCN. In order to further check the catalytic efficiency of the material, record the Tafel slope, CuRu0.5DCN Tafel slope is the smallest, which is beneficial to the catalytic efficiency.