CO2和NO3-偶联在富氧空位的Ru掺杂CeO2纳米棒上高效电催化合成尿素

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中文摘要：利用可再生能源驱动的电催化C-N偶联来合成尿素可以取代高能耗、高污染的工业生产尿素过程.然而,同时提高尿素收率和相应的法拉第效率,目前仍面临挑战.在此,我们设计了富氧空位的Ru掺杂CeO2电催化剂用于高效电化学合成尿素.通过调节Ru的比例,发现最佳掺杂量为5％,该Ru-CeO2电催化剂在电压为-0.7 V vs.RHE时能提供20.2 mmol h-1 g-1的高尿素产率和20.1％法拉第效率,优于大多数已报道的催化剂.实验结果表明,Ru掺杂和氧空位的协同效应优化了反应物的吸附和活化,增强了C-N偶联的动力学,并显著提高了电化学合成尿素的效率.本工作将为开发高效合成尿素的先进C-N偶联电催化剂提供借鉴.

外文标题：Synergistic coupling of CO2 and NO3-for efficient electrosynthesis of urea using oxygen vacancy-rich Ru-doped CeO2 nanorods

外文摘要：The electrocatalytic C-N coupling process for urea synthesis,driven by renewable energy resources,can re-place the energy-intensive and environmentally harmful in-dustrial production of urea.However,achieving improvements in both urea yield and Faradaic efficiency for urea synthesis is currently challenging.Herein,advanced oxygen vacancy-rich Ru-doped CeO2 catalysts were developed for urea synthesis.The optimized 5％Ru-CeO2 exhibited a high urea yield of 20.2 mmol h-1 g-1 and an excellent Faradaic efficiency of 20.1％at-0.7 V vs.reversible hydrogen electrode,surpassing the performance of most reported catalysts.Ex-perimental results reveal that the synergistic effect of Ru doping and oxygen vacancies optimize the adsorption and activation of reactants,which facilitates the kinetics of C-N coupling and significantly improves the efficiency of the electrochemical urea synthesis.This study provides a pro-mising strategy for developing advanced C-N coupling cata-lysts to achieve efficient urea synthesis.

外文关键词：

Ru-CeO2C-N couplingurea synthesiselectro-catalytic activityoxygen vacancies

作者：

余欣、曾诗淇、李磊、姚虎、郑依楠、郭晓辉

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作者单位：

Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education,the College of Chemistry and Materials Science,Northwest University,Xi'an 710069,China

关键词：

Ru-CeO2 C-N coupling urea synthesis electro-catalytic activity oxygen vacancies

基金：

Key Projects of Intergovernmental International Cooperation in Key R&D Programs of the Ministry of Science and Technology ofNational Science Funding Committee of China

项目编号：

2021YFE0115800U20A20250

出版年：

2024

DOI：

10.1007/s40843-023-2797-1

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(5)