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Ribbon-like Nickel Cobaltite with Layer-by-Layer-Assembled Ordered Nanocrystallites for Next-Generation All-Solid-State Hybrid Supercapatteries
journal contribution
posted on 2022-03-24, 21:08 authored by Siddhant Srivastav, Mahesh Kumar Paliwal, Sumanta Kumar MeherIn 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.
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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