ZIF‐8@ZIF‐67‐Derived Nitrogen‐Doped Porous Carbon Confined CoP Polyhedron Targeting Superior Potassium‐Ion Storage

Abstract

Potassium ion batteries (KIB) have become a compelling energy‐storage system owing to their cost effectiveness and the high abundance of potassium in comparison with lithium. However, its practical applications have been thwarted by a series of challenges, including marked volume expansion and sluggish reaction kinetics caused by the large radius of potassium ions. In line with this, the exploration of reliable anode materials affording high electrical conductivity, sufficient active sites, and structural robustness is the key. The synthesis of ZIF‐8@ZIF‐67 derived nitrogen‐doped porous carbon confined CoP polyhedron architectures (NC@CoP/NC) to function as innovative KIB anode materials is reported. Such composites enable an outstanding rate performance to harvest a capacity of ≈200 mAh g−1 at 2000 mA g−1. Additionally, a high cycling stability can be gained by maintaining a high capacity retention of 93% after 100 cycles at 100 mA g−1. Furthermore, the potassium ion storage mechanism of the NC@CoP/NC anode is systematically probed through theoretical simulations and experimental characterization. This contribution may offer an innovative and feasible route of emerging anode design toward high performance KIBs.

Urchin‐Type Architecture Assembled by Cobalt Phosphide Nanorods Encapsulated in Graphene Framework as an Advanced Anode for Alkali Metal Ion Batteries

“…In the initial cathodic procedure, a wide peak at about 1.0–0.0 V is consistent with the potassium ion intercalation into the CoP and the formation of the SEI membrane. In the followed discharge processes, a couple of cathodic peaks at 0.5/1.1 V can be found, which is ascribed to the potassiation/depotassiation [38] . While the positions of anodic peak is basically unchanged, demonstrating the reversibility of redox reaction during the anodic potassiation process.…”

The Current Developments and Perspectives of V2O5 as Cathode for Rechargeable Aqueous Zinc‐Ion Batteries

“…Recently, the 3D or hierarchical structure of nanomaterials has been widely prepared and applied for rechargeable metal‐ion batteries. [ 74–76 ] Because this specific structure mainly has following advances: 1) It can inhibit self‐aggregation of low‐dimensional nanomaterials; 2) The 3D structure not only has high active specific surface area, but also provides large interspace for being conducive to the penetration of electrolyte; 3) Stress effect can be released well for structural integrity by this spatial structure.…”

Hollow Carbon‐Based Nanoarchitectures Based on ZIF: Inward/Outward Contraction Mechanism and Beyond

“…With the development of this ZIF@ZIF strategy toward hollow carbon polyhedrons, other hollow carbon‐based materials with versatile functionalities such as CoP NPs embedded N‐doped carbon nanotube hollow polyhedron (CoP/NCNHP), Fe‐Co alloy/N‐doped carbon cage (Fe 0.3 Co 0.7 /NC cage), and ZnIn 2 S 4 nanosheets coated Co/N‐doped graphitic carbon (Co/NGC@ZnIn 2 S 4 ) nanocages, have been prepared through modified multistep synthetic processes based on the pyrolysis of ZIF‐8@ZIF‐67 composites by Li's group, [ 150 ] Lou's group [ 151,152 ] and others, [ 153,154 ] respectively.…”