Optimizing the rate capability of nickel cobalt phosphide nanowires on graphene oxide by the outer/inter-component synergistic effects

Abstract

Bimetallic phosphides have been identified as promising alternative electrode materials owing to their admirable conductivity and electrochemical activity.

Urchin‐Type Architecture Assembled by Cobalt Phosphide Nanorods Encapsulated in Graphene Framework as an Advanced Anode for Alkali Metal Ion Batteries

“…To track the above issues, the construction of hybrid structure materials consisted of TMPs and carbonaceous materials have been confirmed as an efficient approach [14–16] . On account of the excellent mechanical property and high conductivity of carbonaceous materials, the combination of TMPs with them can not only accommodate the volume effect, but also enhance electrochemical kinetics of TMPs by increasing the electron conductivity [17–19] . In addition, the carbonaceous materials often possess large specific surface areas, which can prevent the TMPs particles from aggregation by acting as dispersed matrices to increase active sites for highly efficient energy storage.…”

Charge Storage Properties of Aqueous Halide Supercapatteries with Activated Carbon and Graphene Nanoplatelets as Active Electrode Materials

“…While CPE 1 and CPE 2 are constant phase elements which correspond to frequency dependent impedance relating to capacitive storage, and semi‐infinite linear diffusion of reacting species, respectively. [ 17,18 ] For the graphical interpretation of the Nyquist plots, the frequency‐dependent capacitance defined by Equation () was used, …”

Nanoarchitectured Design of Vertical‐Standing Arrays for Supercapacitors: Progress, Challenges, and Perspectives

“…Currently, the charge storage mechanisms for supercapacitors involve surface adsorption–desorption processes, surface‐controlled redox reactions, and diffusion‐controlled redox reactions. [ 4–6 ] The criteria for distinguishing the storage mechanisms are based on the normalization formula ( i ( V ) = k 1 v + k 2 v 1/2 ) from Dunn et al., [ 22 ] where V is the potential; v is the scan rate; and k 1 and k 2 represent the diffusion and capacitive current, respectively. After simplification, this formula can be transformed into i ( V ) = av b , where the calculated b value can be used to quantitatively determine the diffusion‐controlled contribution and capacitive contribution.…”

“…Currently, the charge storage mechanisms for supercapacitors involve surface adsorption-desorption processes, surfacecontrolled redox reactions, and diffusion-controlled redox reactions. [4][5][6] The criteria for distinguishing the storage mechanisms are based on the normalization formula (i(…”

“…[ 4,5 ] The charge storage mechanisms are based on the physical adsorption of ions for electrical double layer capacitors (EDLCs), surface‐controlled redox reactions for pseudocapacitive electrodes, and diffusion‐controlled redox reaction for battery‐type electrodes. [ 4–6 ] As the charge storage in supercapacitors is mainly a surface phenomenon, constructing various nanostructured nanomaterials can improve the electrochemical performance by enlarging the surface areas and shortening the transport pathways. [ 7 ] Various nanostructured electrodes such as nanoparticles, nanowires, and nanosheets have been constructed to enhance the electrochemical performance of supercapacitors.…”