A Facile Grinding Method for the Synthesis of 3D Ag Metal–Organic Frameworks (MOFs) Containing Ag<sub>6</sub>Mo<sub>7</sub>O<sub>24</sub> for High‐Performance Supercapacitors
Xinyu Zhao, Lige Gong, Chunxiao Wang, Chunmei Wang, Kai Yu, Baibin Zhou
Abstract
Abstract Successful synthesis of three kinds of dynamically stable compounds by a simple grinding method is reported, giving Ag 6 Mo 7 O 24 , Ag‐BTC (Ag‐MOF, BTC=benzene‐1,3,5‐tricarboxylic acid), and {Ag 6 Mo 7 O 24 }@Ag‐MOF metal–organic frameworks (MOFs). According to the electrochemical dynamic analysis, these materials have pseudocapacitor behavior and high capacitance. The unique nanorod structure of {Ag 6 Mo 7 O 24 }@Ag‐MOF provides more active sites, faster ion/electron transfer, and electrolyte diffusion pathways, resulting in excellent specific capacitance (971 F g −1 ) higher than the other compounds. {Ag 6 Mo 7 O 24 }@Ag‐MOF (glassy carbon electrode) also has an excellent rate ability (60.1 %) and long cycle stability (98 % retention after 5000 cycles). In addition, the fully symmetrical button battery (with nickel foam as the current collector) fabricated with {Ag 6 Mo 7 O 24 }@Ag‐MOF delivers an energy density of 11.1 Wh kg −1 at 600.1 Wh kg −1 coupled with excellent cycling stability (86.4 %) at 1.2 V. These results demonstrate a new simple grinding method to prepare polyoxometalate‐based metal–organic frameworks (POMOFs) for high‐performance materials.