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 

机构地区：[1]Department of Materials Science&Engineering,Ajou University,Suwon 16499,Republic of Korea [2]Department of Energy Systems Research,Ajou University,Suwon 16499,Republic of Korea [3]Department of Nanotechnology and Advanced Materials Engineering,Sejong University,Seoul 05006,Republic of Korea [4]Department of Chemistry,Sookmyung Women's University,Seoul 04310,Republic of Korea [5]Department of Nano Engineering and Department of Nano Science and Technology,SKKU Advanced Institute of Nanotechnology(SAINT),Sungkyunkwan University,Suwon,Republic of Kore [6]SKKU Institute of Energy Science and Technology(SIEST),Sungkyunkwan University,Suwon,Republic of Kore [7]School of Energy Technology,Korea Institute of Energy Technology(KENTECH),Jeonnam 58217,Republic of Korea

出　　处：《Journal of Energy Chemistry》2024年第12期475-483,共9页能源化学（英文版）

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

摘　　要：Electrochemical nitrate reduction(ENR)is an economical and eco-friendly method for converting industrial wastewater into valuable ammonia under atmospheric conditions.The main challenge lies in designing and developing highly durable ENR electrocatalysts.This 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 performance.We found surface defects(oxygen vacancies and Cu^(+))and unique mesoporous nanowire structure composed of tightly interconnected nanoparticles.The 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 defects.Theoretical calculation further suggests oxygen vacancies enhance NO_(3)^(-)adsorption on the sf-CuO NWs’surface and mitigate the competing hydrogen evolution reaction.This study outlines a strategic design and simple synthesis approach for nanowire electrocatalysts that boost the efficiency of electrochemical nitrate-to-ammonia conversion.

关 键 词：CuO nanowires Solution-flame MESOPOROUS Oxygen vacancy Electrochemical nitrate reduction Wastewater 

分 类 号：TQ113.2[化学工程—无机化工] O643.36[理学—物理化学] TB383.1[理学—化学]