首页|Solution-flame hybrid synthesis of defect-enriched mesoporous CuOx nanowires for enhanced electrochemical nitrate-to-ammonia production

Solution-flame hybrid synthesis of defect-enriched mesoporous CuOx nanowires for enhanced electrochemical nitrate-to-ammonia production

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Electrochemical nitrate reduction(ENR)is an economical and eco-friendly method for converting indus-trial wastewater into valuable ammonia under atmospheric conditions.The main challenge lies in design-ing and developing highly durable ENR electrocatalysts.This study introduces defect-rich mesoporous CuOx nanowires electrocatalyst synthesized using a novel solution-flame(sol-flame)hybrid method to control mesoporosity and introduce surface defects,thereby enhancing the electrochemical nitrate-to-ammonia production performance.We found surface defects(oxygen vacancies and Cu+)and unique mesoporous nanowire structure composed of tightly interconnected nanoparticles.The sol-flame-synthesized CuOx 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 gener-ated defects.Theoretical calculation further suggests oxygen vacancies enhance NO3-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.

CuO nanowiresSolution-flameMesoporousOxygen vacancyElectrochemical nitrate reductionWastewater

Li Qu、Sungkyu Kim、Runfa Tan、Arumugam Sivanantham、Seokgi Kim、YooJae Jeong、Min Cheol Kim、Seong Sik Shin、Uk Sim、In Sun Cho

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Department of Materials Science & Engineering,Ajou University,Suwon 16499,Republic of Korea

Department of Energy Systems Research,Ajou University,Suwon 16499,Republic of Korea

Department of Nanotechnology and Advanced Materials Engineering,Sejong University,Seoul 05006,Republic of Korea

Department of Chemistry,Sookmyung Women's University,Seoul 04310,Republic of Korea

Department of Nano Engineering and Department of Nano Science and Technology,SKKU Advanced Institute of Nanotechnology(SAINT),Sungkyunkwan University,Suwon,Republic of Korea

SKKU Institute of Energy Science and Technology(SIEST),Sungkyunkwan University,Suwon,Republic of Korea

School of Energy Technology,Korea Institute of Energy Technology(KENTECH),Jeonnam 58217,Republic of Korea

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2024

10.1016/j.jechem.2024.07.057

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.99(12)