Discrete nanographene implanted in zirconium metal-organic framework for electrochemical energy storage.

Stable metal-organic frameworks (MOFs) with the required functions have unique advantages in practical applications. Herein, we studied the electrochemical property of a stable zirconium-based MOF, Zr 6 (μ 3 -O) 4 (μ 3 -OH) 4 (OH) 6 (H 2 O) 6 (HCHC) (PCN-136), which contains a hexacarboxylate linker with a π-conjugated nanographene moiety (HCHC ​= ​hexakis(4-carboxyphenyl)hexabenzocoronene). In light of the high chemical stability and π-conjugated nanographene moiety, PCN-136 exhibits a specific capacitance of 694 ​F ​g−1 at the current density of 0.5 ​A ​g−1 in a 6 ​M KOH aqueous solution. PCN-136 holds great potential as a high-performance capacitive material for electrochemical energy storage. The electrochemical properties of a stable zirconium-based MOF construct by hexacarboxylate linker with a π-conjugated nanographene moiety were studied. Image 1 • A porous Zr-MOF (PCN-136) with π-conjugated nanographene was prepared by chemical post-modification of the organic ligand. • The introduction of a π-conjugated nanographene moiety improves the conductivity of PCN-136. • PCN-136 holds a great potential as high-performance capacitive material for electrochemical energy storage. [ABSTRACT FROM AUTHOR]