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Ribbon-like Nickel Cobaltite with Layer-by-Layer-Assembled Ordered Nanocrystallites for Next-Generation All-Solid-State Hybrid Supercapatteries
journal contributionposted on 2022-03-24, 21:08 authored by Siddhant Srivastav, Mahesh Kumar Paliwal, Sumanta Kumar Meher
In the context to develop ultra-efficient electrode materials with good physicoelectrochemical and electrostructural properties, for their application in high-performance supercapatteries, herein, a facile tartrate-mediated inhibited crystal growth method is reported to engineer thoroughly uniform ribbon-like nickel cobaltite (NiCo2O4) microstructure with unique layer-by-layer-assembled nanocrystallites. This material demonstrates significant kinetic reversibility, good rate efficiency and bulk diffusibility of the electroactive ions, and a predominant semi-infinite diffusion mechanism during the redox-based charge storage process. This material also shows bias-potential-independent equivalent series resistance, very low charge-transfer resistance, and diagonal Warburg profile, corresponding to the ion diffusion occurring during the electrochemical processes in supercapacitors and batteries. Further, the fabricated NiCo2O4-based all-solid-state supercapattery (NiCo2O4||N-rGO) delivers excellent rate-specific capacity, very low internal resistance, good electrochemical and electrostructural stability (∼94% capacity retention after 10,000 charge–discharge cycles), energy density (31 W h kg–1) of a typical rechargeable battery, and power density (13,003 W kg–1) of an ultra-supercapacitor. The ultimate performance of the supercapattery is ascribed to low-dimensional crystallites, ordered inter-crystallite and channel-type bulk and boundary porosity, multiple reactive equivalents, enhanced electronic conductivity, and “ion buffering pool” like behavior of ribbon-like NiCo2O4, supplemented with enhanced electronic and ionic conductivities of N-doped rGO (negative electrode) and PVA/KOH gel (electrolyte separator), respectively.
typical rechargeable batterymultiple reactive equivalentsion diffusion occurringinfinite diffusion mechanismdiagonal warburg profiledelivers excellent rate003 w kglike nickel cobaltiteefficient electrode materialsgood rate efficiencystate hybrid supercapatteriesenhanced electronic conductivity2 sublow internal resistanceassembled ordered nanocrystallitesenhanced electronicassembled nanocrystallitestransfer resistanceperformance supercapatteriesordered internegative electrodegood physicoelectrochemicalgood electrochemicallike nicoultimate performancetype bulkstate supercapatteryspecific capacitypredominant semipower densitylow chargekoh gelionic conductivitiesfacile tartrateelectrostructural propertieselectrochemical processeselectroactive ionsdimensional crystallitescapacity retentionbulk diffusibilityboundary porosity