Solution-flame hybrid synthesis of defect-enriched mesoporous CuO_(x) nanowires for enhanced electrochemical nitrate-to-ammonia production

作     者：Li Qu Sungkyu Kim Runfa Tan Arumugam Sivanantham Seokgi Kim Yoo Jae Jeong Min Cheol Kim Seong Sik Shin Uk Sim In Sun Cho 

作者机构：Department of Materials Science&EngineeringAjou UniversitySuwon 16499Republic of Korea Department of Energy Systems ResearchAjou UniversitySuwon 16499Republic of Korea Department of Nanotechnology and Advanced Materials EngineeringSejong UniversitySeoul 05006Republic of Korea Department of ChemistrySookmyung Women's UniversitySeoul 04310Republic of Korea Department of Nano Engineering and Department of Nano Science and TechnologySKKU Advanced Institute of Nanotechnology(SAINT)Sungkyunkwan UniversitySuwonRepublic of Kore SKKU Institute of Energy Science and Technology(SIEST)Sungkyunkwan UniversitySuwonRepublic of Kore School of Energy TechnologyKorea Institute of Energy Technology(KENTECH)Jeonnam 58217Republic of Korea 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2024年第99卷第12期

页      面：475-483页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.-RS-2024-00335976) 

主　　题：CuO nanowires Solution-flame Mesoporous Oxygen vacancy Electrochemical nitrate reduction Wastewater 

摘      要：Electrochemical nitrate reduction(ENR)is an economical and eco-friendly method for converting industrial wastewater into valuable ammonia under atmospheric *** main challenge lies in designing and developing highly durable ENR *** study introduces defect-rich mesoporous CuO_(x) nanowires electrocatalyst synthesized using a novel solution-flame(sol-flame)hybrid method to control mesoporosity and introduce surface defects,thereby enhancing the electrochemical nitrate-toammonia production *** found surface defects(oxygen vacancies and Cu^(+))and unique mesoporous nanowire structure composed of tightly interconnected *** sol-flamesynthesized CuO_(x) nanowires(sf-CuO NWs)achieved superior ammonia yield rate(0.51 mmol h^(-1)cm^(-2)),faradaic efficiency(97.3%),and selectivity(86.2%)in 1 M KOH electrolyte(2000 ppm nitrate).This performance surpasses that of non-porous and less-defective CuO NWs and is attributed to the increased surface area and rapid electron transport facilitated by the distinctive morphology and generated *** calculation further suggests oxygen vacancies enhance NO_(3)^(-)adsorption on the sf-CuO NWs’surface and mitigate the competing hydrogen evolution *** study outlines a strategic design and simple synthesis approach for nanowire electrocatalysts that boost the efficiency of electrochemical nitrate-to-ammonia conversion.