A 3D Keggin‐Type Phosphomolybdate‐Based Coordination Polymer for Improving Electrochemical Behavior for Supercapacitors

The design and building of electrode materials with excellent electrochemical energy storage capabilities and high cycling stability to tackle energy scarcity is always the critical challenging for accelerating the development of supercapacitors. To address this challenge, polyoxometalate (POM)‐based coordination polymers (POMCPs), which aim to combining the multielectron redox properties of POMs with diversiform structures and high surface area of metal–organic complexes, are alternative and suitable electrode materials for supercapacitors. Herein, one novel POMCP [{Cu 3 (tpb) 3 }{PMo 12 O 40 }] (tpb = 1,4‐Di(1H‐1,2,4‐triazol‐1‐yl)benzene) is successfully obtained and applied as electrode materials for supercapacitors. In this POMCP, the 5‐capped polyoxoanion, the Kegging‐type {PMo 12 }, is filled in the 3D interpenetrated framework to construct a charming 3D POMCP. As the electrode material, this POMCP exhibits better specific capacitance values of 115, 104, 100, 90, 84, and 75 F g −1 at different current density, respectively. In addition, it can also maintain impressive cycling stability after 1000 cycles. These electrochemistry performances emphasize the considerable potential of POMCP‐based electrode materials for supercapacitors.