The role of uniformly distributed ZnO nanoparticles on cellulose nanofibers in flexible solid state symmetric supercapacitors

Abstract

Paper—a flexible, foldable, and cost-effective substrate made of one-dimensional cellulose nanofibers (1D-CNF)—is being extensively investigated as a promising aspirant to wearable as well as foldable energy storage appliances. However, the...

In Situ Wet Synthesis of N-ZnO/N-rGO Nanohybrids as an Electrode Material for High-Performance Supercapacitors and Simultaneous Nonenzymatic Electrochemical Sensing of Ascorbic Acid, Dopamine, and Uric Acid at Their Interface

“…From this curve, the cell capacitance values have been calculated to be 138.5, 137.5, 111, 87, 74, 59, and 43 F/g. Further, the cyclic stability of the SSC has been tested for 10,000 cycles, which showed a high cyclic stability of 101% with a Coulombic efficiency of 99% (Figure c), which is much higher than those reported earlier. ,,,− Such a high cyclic stability might be attributed to the strong chemical interactions of N-ZO and N-rGO through Zn–C/Zn–O–C/O–Zn-N bonds, as was evidenced by XPS spectroscopy. To study the change in impedance parameters, the Nyquist plots were recorded before and after 10,000 cycles (Figure d).…”

“…Among other metal oxides, zinc oxide (ZnO) is known to have fairly high chemical and electrochemical stability, low toxicity, biocompatibility, abundant availability, and eco-friendly nature, besides being a Food and Drug Administration (FDA)-approved safer material exhibiting antimicrobial and anticancer activities. − However, its relatively poor electrical conductivity necessitates preparation of its hybrid with some conducting phase for its usage as an electrode material in developing energy storage devices. Specifically, its nanohybrids with reduced graphene oxide (rGO) have been reported to reduce the restacking associated with rGO, resulting in an increase in the electrical conductivity of nanohybrids as compared to ZnO, thereby improving the electrochemical performance .…”

Phase transformations in the nickel phosphide system induced by transition-metal doping and their electro-catalytic study

“…6, pointing to good redox reversibility. 2,48 The specific capacitance of all electrodes was calculated by integrating the plot area within the CV's curve following eqn (1).where C (F g −1 ) is the specific capacitance in F g −1 , A is the area under the CV curve in cm 2 , m is the mass of the electrode in g, is scan rate in V s −1 , and Δ V is the potential window in V. It is important to note that the CV curves of NiP-3 showed pairs of distinct redox peaks (anodic peak ≈ +0.55 V and cathodic peak ≈ +0.28 V) corresponding to Ni 2+ /Ni 3+ redox transitions similar to the study by Liu et al 49 All the nickel phosphide electrodes also showed the Ni 2+ /Ni 3+ redox transitions (illustrated in eqn (2) and (3)) typical of faradaic capacitive behavior of the battery-type.Ni 5 P 4 + 5OH − ⇌ Ni 5 P 4 (OH) 5 + 5e − Ni 2 P + 2OH − ⇌ Ni 2 P(OH) 2 + 2e − …”

A high‐performance hybrid supercapacitor electrode based on ZnO/nitrogen‐doped carbon nanohybrid

“…[ 45 ] ZnO nanoparticles showed the highest capacitance. The electrochemical performance of ZnO can be improved via conjugation with other metal oxides such as MnO x , [ 46 ] NiO/graphene oxide (GO), [ 47 ] CeO 2 , [ 48 ] (Ni, Co)Se 2 , [ 50 ] Co 3 O 4 , [ 51 ] cellulose nanofibers, [ 52 ] and ZIF‐8. [ 44 ] ZnO/MnO x nanocomposites provided a capacitance of 556 F·g −1 at a current density of 1 A·g −140 .…”