Affiliation:
1. The State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 100084 P. R. China
2. The State Key Laboratory of Chemical Engineering and Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Chemical Engineering School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China
Abstract
AbstractEfficient manufacture of electroactive vertically‐oriented nanosheets with enhanced electrolyte mass diffusion and strong interfacial redox dynamics is critical for realizing high energy density of miniature supercapacitor (SC), but still challenging. Herein, microfluidic droplet printing is developed to controllably construct vertically‐oriented graphene/ZIF‐67 hetero‐microsphere (VAGS/ZIF‐67), where the ZIF‐67 is coordinately grown on vertically‐oriented graphene framework via Co─O─C bonds. The VAGS/ZIF‐67 shows ordered porous channel, high electroactivity and strong interfacial interaction, providing rapid electrolyte diffusion dynamics and high faradaic capacitance in KOH solution (1674 F g−1, 1004 C g−1), which are verified by computational fluid dynamics (CFD) and density functional theory (DFT). Moreover, the VAGS/ZIF‐67 based SC exhibits large energy density (100 Wh kg−1), excellent durability (10 000 cycles and high/low temperature), and robust power‐supply applications in portable electronics.
Funder
National Natural Science Foundation of China
National Postdoctoral Program for Innovative Talents
China Postdoctoral Science Foundation
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry