Hierarchically Engineered Nanocarbon Florets as Bifunctional Electrode Materials for Adsorptive and Intercalative Energy Storage

Abstract

Three-dimensional dendritic nanostructured carbon florets (NCFs) with tailored porosity are demonstrated as electrochemically versatile electrodes for both adsorptive and intercalative energy storage pathways. Achieved through a singlestep template-driven approach, the NCFs exhibit turbostratic graphitic lamellae in a floral assembly leading to high specific surface area and multi-modal pore distribution (920 m 2 /g). The synergism in structural and chemical frameworks, along with openended morphology, enables bifunctionality of hard carbon NCFs as symmetric adsorptive electrodes for supercapacitors (SCs) and intercalation anodes for hybrid potassium-ion capacitors (KICs). Flexible, all-solid-state SCs through facile integration of NCF with the ionic-liquid-imbibed porous polymeric matrix achieve high-energy density (20 W h/kg) and power density (32.7 kW/kg) without compromising on mechanical flexibility and cyclability (94% after 20k cycles). Furthermore, NCF as an anode in a full-cell hybrid KIC (activated carbon as cathode) delivers excellent electrochemical performance with maximum energy and power densities of 57 W h/kg and 12.5 kW/kg, respectively, when cycled in a potential window of 1.0−4.0 V. The exceptional bifunctional performance of NCF highlights the possibility of utilizing such engineered nanocarbons for high-performance energy storage devices.

Premagnetized Carbon-Catalyst Interface Delivering 650% Enhancement in Electrocatalytic Kinetics of Hydrogen Evolution Reaction

“…No such spectral shift is observed for the G-band, pinpointing the origin of the D-band to double-resonance Raman scattering arising from the disordered graphitic structure. Such a turbostratic graphitic lamellar structure also provides a large surface area (936 m 2 /g) and an accessible pore volume (1.03 cm 3 /g), an aspect central to the diffusional access of the reactants and products (Figure g) . This also enables the randomly oriented and interconnected graphitic domains to glide across each other (vide infra).…”

“…Such a turbostratic graphitic lamellar structure also provides a large surface area (936 m 2 /g) and an accessible pore volume (1.03 cm 3 /g), an aspect central to the diffusional access of the reactants and products (Figure 1g). 29 This also enables the randomly oriented and interconnected graphitic domains to glide across each other (vide infra). The hydrophilicity of NCF, created by the surface hydroxyl and carboxylic groups, aids in nucleation and anchoring of cobalt ions (Co 2+ ) leading to the formation of cubic spinel Co 3 O 4 nanoparticles.…”

“Plains–Hills”: A New Model to Design Biomass-Derived Carbon Electrode Materials for High-Performance Potassium Ion Hybrid Supercapacitors

“…Even at high power density (10500 W kg –1 ), the as-obtained PIHC can still retain the energy density of 115 Wh kg –1 , which is competitive to previously reported carbon-based asymmetrical PIHCs (Table S1). ,,− Moreover, the CACF-2//CACF-2 PIHCs exhibit an excellent cycling capability. A 75.2% capacity retention can be obtained at 5 A g –1 after 10 000 cycles with nearly 100% Coulombic efficiency (Figure e), and even after 30 000 cycles, a 51.4% capacity retention can be achieved.…”

Design Principles for Manipulating Electrochemical Interfaces in Solid-State Supercapacitors for Wearable Applications

“…Illustrative schematics and electron microscope images. ,− Images are adapted with permission from refs and − . Copyright 2019 American Chemical Society, Copyright 2020 American Chemical Society, Copyright 2017 Wiley, Copyright 2011 RSC, Copyright 2013 Wiley, Copyright 2018 Wiley, Copyright 2013 Nature Publishing Group, Copyright 2013 RSC, Copyright 2020 American Chemical Society.…”