摘要
杂原子掺杂是提高金属氧化物本征催化活性的重要手段之一.本文采用水热和高温退火相结合的方法,将Cu^(2+)掺入Co_(3)O_(4)尖晶石晶格中成功制备了Cu@Co_(3)O_(4),通过X射线衍射、拉曼、透射电子显微镜、光电子能谱仪以及扫描电镜确定了Cu^(2+)掺杂于Co_(3)O_(4)尖晶石晶格中.电化学性能研究表明Cu@Co_(3)O_(4)具有较良好的析氧活性和稳定性.在1.0 M KOH的电解液中,Cu@Co_(3)O_(4)在电流密度为10 mA cm^(-2)下需要336 mV的过电势,Tafel斜率为119.08 mV dec^(-1).这主要是因为Cu^(2+)掺杂四氧化三钴晶格中产生了氧空位,导致了Co_(3)O_(4)的局部晶格畸变,引发了电子的重新排布,促进了Cu与Co的电子之间的相互作用,从而提升了催化剂的本征活性.
Heteroatom doping is one of the important means to improve the intrinsic catalytic activity of metal oxides.In this paper,the Cu^(2+)was successfully doped into the Co_(3)O_(4)spinel lattice(Cu@Co_(3)O_(4))using the hydrothermal and high temperature annealing methods,which was confirmed by X-ray diffraction,Raman,Transmission electron microscope,X-ray photoelectron spectroscopy and scanning electron microscopy.Electrochemical performance studies show that Cu@Co_(3)O_(4)has good oxygen evolution activity and stability,In 1.0 M KOH electrolyte,Cu@Co_(3)O_(4)required an overpotential of 336 mV at a current density of 10 mA cm^(-2)and a Tafel slope of 119.08 mV dec^(-1).The main reason is that the oxygen vacancy generated in the Cu^(2+)doped Co_(3)O_(4)lattice leads to local lattice distortion of Co_(3)O_(4),triggers rearrangement of electrons,promoting the interaction between Cu and Co electrons,thereby improving the intrinsic activity of the catalyst.
作者
张登娥
杨阳
贾研
晁锐
李继凯
ZHANG Deng-e;YANG Yang;JIA Yan;CHAO Rui;LI Ji-kai(College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)
出处
《陕西科技大学学报》
北大核心
2024年第6期88-95,共8页
Journal of Shaanxi University of Science & Technology
基金
陕西省自然科学基础研究计划项目(2024JC-YBMS-131)。
