基于醌基的共价有机框架用于电催化析氧反应

Quinone-based Covalent Organic Frameworks for Efficient Oxygen Evolution Reaction

将蒽醌作为构筑单元设计合成了醌基功能化的新型2,6-二氨基蒽醌共价有机框架(DAAQ-COF).粉末X射线衍射、氮气吸附-脱附、红外和热重等分析结果表明,DAAQ-COF具有高的结晶度和比表面积(577m^2/g).此外,醌基功能化的无金属DAAQ-COF显示出高的析氧反应(OER)活性(10 m A/cm^2下,过电位389m V,Tafel斜率135 m V/dec).这源于引入的醌基基团有效改变了COF框架的电子结构和化学特性,加上COF材料本身的高结晶度和比表面积,使得反应物能更有效地与活性位点接触,从而促进OER进程.这些结果表明合理地设计功能化的COF材料能够进一步推动此类材料在电催化领域的应用.

Covalent organic frameworks(COFs)are a new kind of crystalline organic porous polymers with high specific surface area,regular structure and designability,which has been applied in many domains.However,functionalized covalent organic frameworks still need to be further explored.Herein,a quinone-based COF(2,6-diaminoanthraquinone-COF,DAAQ-COF)was synthesized by using anthraquinone as building blocks,and characterized by powder X-ray diffraction(PXRD),nitrogen adsorption-desorption analysis,Fourier transform infrared(FTIR)spectrometry and thermogravimetry analysis(TGA)etc.It is showed that the synthesized DAAQ-COF has high crystallinity and specific surface area(577 m^2/g).Furthermore,quinone-functionalized metal-free DAAQ-COF exhibits effective oxygen evolution reduction(OER),with a overpotential of 389 mV at 10 mA/cm^2 and a Tafel slope of 135 mV/dec.The introduced quinone group effectively changes the electronic structure and chemical properties of the COF framework,as well as the high crystallinity and specific surface area of the COF material itself,which allows the reactant more efficiently accessible to the active sites for better OER performance.These results show that the rational design of functionalized COFs can promote the development of their broader application prospects in OER.