Nickel Cobalt Pyrophosphate Porous Microplates for High Performance and Durable Charge Storage

Nickel cobalt pyrophosphate porous microplate is prepared through the post-treatment of single-crystal NH4-Ni-Co phosphate. By creating porous structure on the single crystal microplate, more electronic defects can be introduced, and thus increase the ionic conductivity and charge transfer channels. Consequently, the as-prepared material exhibits outstanding electrochemical performance when tested as electrode in 1 M KOH electrolyte. Specifically, a high record high specific capacity of 185.2 mAh g(-1) is achieved at a current density of 1 A g(-1), which remains 181.6 mAh g(-1) at the current density of 10 A g(-1). Promisingly, the material also demonstrates a remarkable cycling stability with 68.5% capacity retention after 5000 charge/discharge cycles at 5 A g(-1).