Pseudocapacitive Charge Storage in Thin Nanobelts

Abstract

This article reports that extremely thin nanobelts (thickness ~ 10 nm) exhibit pseudocapacitive (PC) charge storage in the asymmetric supercapacitor (ASC) configuration, while show battery-type charge storage in their single electrodes. Two types of nanobelts, viz. NiO-Co 3 O 4 hybrid and spinal-type NiCo 2 O 4 , developed by electrospinning technique are used in this work. The charge storage behaviour of the nanobelts is benchmarked against their binary metal oxide nanowires, i.e., NiO and Co 3 O 4 , as well as a hybrid of similar chemistry, CuO-Co 3 O 4. The nanobelts have thickness of ~ 10 nm and width ~ 200 nm, whereas the nanowires have diameter of ~ 100 nm. Clear differences in charge storage behaviours are observed in NiO-Co 3 O 4 hybrid nanobelts based ASCs compared to those fabricated using the other materials-the former showed capacitive behaviour whereas the others revealed battery-type discharge behaviour. Origin of pseudocapacitance in nanobelts based ASCs is shown to arise from their nanobelts morphology with thickness less than typical electron diffusion lengths (~ 20 nm). Among all the five type of devices fabricated, the NiO-Co 3 O 4 hybrid ASCs exhibited the highest specific energy, specific power and cycling stability.

Void Space Control in Porous Carbon for High-Density Supercapacitive Charge Storage

“…(See Table S5 and Figure S6.) An improved rate capability and pseudocapacitance were also recently demonstrated in thin nanostructures, which is similar to the petals in the present nanoflowers . To validate these claims, the areal capacitances of the best performing electrodes were determined and are compared in Table .…”

“…An improved rate capability and pseudocapacitance were also recently demonstrated in thin nanostructures, which is similar to the petals in the present nanoflowers. 48 To validate these claims, the areal capacitances of the best performing electrodes were determined and are compared in Table 1. An order-ofmagnitude higher areal capacitance is observed for the MC electrodes, which is expected to be the reason for the improved rate capability.…”

Integrated 8 Wisdom Compounds Interaction in Multitasking Healing System: Confinement Energy in 4D Frequency Interconnection

“…Nanoscience and nanotechnology of exotic materials with their optical properties have been a rapid increasing field of study in this 21 st century [1][2][3][4][5][6][7]. Such incredible nanostructures have been expanded in a deep research for mobile energy storage applications [8][9][10][11][12]. To enhance the wisdom extracted from a pure knowledge with detail understanding in the associated particular field, a novel philosophy, local wisdom and control system as well as a breakthrough thought in science according to daily life of human being are necessary to be implemented [13][14][15][16].…”

Multifunctional Self‐Charging Electrochromic Supercapacitors Driven by Direct‐Current Triboelectric Nanogenerators

“…[ 1–4 ] Many electrochromic species can also be used as energy storage active materials, including metal oxides (WO 3 , V 2 O 5 , NiO), hexacyanometalsalts ([Fe III Fe II (CN) 6 ] − ), viologen (bipyridilium compounds) and conjugated polymers, due to the fact that their characteristic color change is induced by electrochemical reactions. [ 5–10 ] Therefore, dual‐function devices have been reported to serve simultaneously as both electrochromic and energy storage devices. [ 11–14 ] In particular, electrochromic supercapacitors have been reported with excellent electrochemical performances and potentially real‐time indication of the energy level by their colors.…”