摘要
本文采用水热法合成了四种MOFs催化剂,分别通过XRD、SEM及IR表征了催化剂的组成和微观结构,进而研究了催化剂的NRR活性,最后探究了交流磁场对催化剂NRR活性的影响及作用机制.结果表明:四种催化剂中,Fe-BTC在-0.376 V(vs.RHE)和80℃时具有最高的氨产率和法拉第效率,分别为3.63×10^(-10) mol s^(1) cm^(-2)和0.31%;在恒电位下,当交流磁场的强度为4.355 mT,频率为50 kHz时,催化剂的氨产率和法拉第效率最大,分别为3.61×10^(-9) mol s^(-1) cm^(-2)和5.67%,比无磁场时分别提高约10倍和18倍,这种增效一方面源于交流磁场增加了N_(2)在Fe-BTC表面的吸附量,另一方面,交流磁场产生的感应电动势与电场本身的电势的叠加作用,为NRR反应提供了额外能量所致.
In this paper,four kinds of MOFs catalysts were synthesized by hydrothermal method.The composition and microstructure of the catalysts were characterized by XRD,SEM and IR,respectively.Then,the NRR activity of the catalysts was studied.The results showed that Fe-BTC had the highest ammonia yield and Faraday efficiency at-0.376 V(vs.RHE)and 80℃,with values of 3.63×10^(-10) mol s^(-1) cm^(-2) and 0.31%,respectively.Under constant voltage,when the alternating magnetic field intensity is 4.355 mT,frequency is 50 kHz,the catalyst ammonia production rate and efficiency of Faraday's largest,were 3.61×10^(-9) mol s^(-1) cm^(-2) and 5.67%,respectively.This phenomenon is mainly due to the increase of the adsorption amount of N_(2) on the Fe-BTC surface by the alternating magnetic field,and the superposition of the induced electromotive force generated by the alternating magnetic field and the electric potential of the electric field itself,which provides extra energy for the NRR reaction.
作者
高朋召
张佩
李玉玲
马冯
覃航
刘小磐
郭文明
肖汉宁
GAO Pengzhao;ZHANG Pei;LI Yuling;MA Feng;QIN Hang;LIU Xiaopan;GUO Wenming;XIAO Hanning(College of Materials Science and Engineering,Hunan University,Changsha 410082,China;Hunan Zhongtai Special Equipments Co,Ltd.Changde 415211,China;College of Chemistry and Materials Engineering,Hunan University of Arts and Science,Changde 415000,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第6期162-171,共10页
Journal of Hunan University:Natural Sciences
基金
湖南省科技创新计划资助(2020RC2082)。
关键词
电催化氮还原反应
金属有机框架
交流磁场
氨产率
法拉第效率
electrochemical nitrogen reduction(NRR)
MOFS
AC magnetic field
ammonia yield
Faraday efficiency
