摘要
A redox-active tetrazine moiety is immobilized within a metal-organic framework(MOF)aiming at targeted construction of a cathode with improved performance for lithium–oxygen batteries.A 1,2,4,5-tetrazine(Tz)functionalized ligand is used to construct a nanoporous MOF,Tz-Mg-MOF-74,in which the redox activity of the Tz moiety is retained.Combining the redox activity of Tz with the porous nature of a MOF produced a Tz-Mg-MOF-74-based cathode with significantly improved electrochemical performance.Specifically,the material has improved sustainable capacity with a lower overpotential compared with otherwise similar batteries without Tz and other reported MOF-based catalysts.The present approach productively integrates electrochemical activity derived from redox-active moieties and MOFs,and this combination opens a new avenue for the design of effective materials for energy storage and conversion.
基金
supported by the NSFC(nos.21421001,21531005,21905142,and 21671112)
the Program of Introducing Talents of Discipline to Universities(no.B18030)
the Natural Science Fund of Tianjin(nos.19JCZDJC37200 and 19JCQNJC02600)
China.The authors thank Professor Brian Space(University of South Florida,Tampa,FL)for discussion and help.
