Date 2023-03-28 
Time 16:00 

■ 제 목Unzipping of Carbon Nanotubes: A Promising Route towards Novel Edge Chemistry of Graphene for Electrochemical Applications


 연 사:  임준원 교수 (경희대학교 정보디스플레이학과)                


■  일 시:  2023년 3월 28(화) 오후 4시 


■  장 소:  응용공학동 1층 영상강의실 


■ Host :  김상욱 교수


■ Abstract :  
Atomic level engineering of two-dimensional nanomaterials is highly demanded for the customized structures and properties aiming at different applications. Unzipping of graphene plane is a strong candidate to this purpose, but uncontrollable damage of the two-dimensional crystalline framework during harsh unzipping reaction has remained as the key challenge. In this presentation, we would like to introduce novel edge chemistry of graphene based on heteroatom dopant-specific unzipping of carbon nanotubes as a reliable and controllable route to customized intact crystalline graphene-based nanostructures. Substitutional pyridinic nitrogen dopant sites at carbon nanotubes can selectively initiate the unzipping of CNT side walls at a relatively low electrochemical potential. The resultant nanostructures consisting of unzipped graphene nanoribbons wrapping around carbon nanotube cores maintain the intact two-dimensional crystallinity. The well-defined edges of unzipped graphene nanoribbons provide an opportunity for novel edge chemistry, distinguished from typical chemical modifications on the basal plane of graphene. As a representative application exploiting unique edges properties, we demonstrate selective nitrogen-pair (2N) doping into the unzipped edges, showing outstanding bifunctional catalytic activity toward oxygen reduction/evolution reaction.