Graphene-based cobalt sulfide composite hydrogel with enhanced electrochemical properties for supercapacitors

Abstract

The three-dimensional cobalt sulfides/graphene hydrogel nanocomposites were prepared via a one-step method in a water–isopropanol system with enhanced electrochemical performance.

One‐Step Synthesis of CoS‐Doped β‐Co(OH)2@Amorphous MoS2+x Hybrid Catalyst Grown on Nickel Foam for High‐Performance Electrochemical Overall Water Splitting

“…[ 34 ] The narrow absorption peak at ≈3650 cm −1 corresponds to the -OH of brucite-like structure. [ 36 ] Additional peaks of 779.1 and 780.8 eV indicate the presence of Co  S nanoparticles [ 37 ] and bridging CoS x . [ 35 ] The X-ray photoelectron spectroscopy (XPS) results are in Figure 2 c-f. At the Co 2p 3/2 region in Figure 2 c, the binding energy of β-Co(OH) 2 exhibits two individual peaks at 780.4 and 782.2 eV and one shake-up satellite at about 786.0 eV.…”

One-step solid phase synthesis of a highly efficient and robust cobalt pentlandite electrocatalyst for the oxygen evolution reaction

“…However, the complex bonding modes between cobalt and sulfur make the desired stoichiometric Co 9 S 8 synthesis relatively challenging and often results in intricate crystal structure. 39 To date, a number of synthetic methods including hydrothermal, 40 solution-phase, 41, 42 and wetchemical 26 have been demonstrated. Pyrolysis has been a popular and fairly successful method of preparing such materials, but has several drawbacks, such as the use of toxic and hazardous gases (H 2 , H 2 S).…”

Facile synthesis of NF/ZnOx and NF/CoOx nanostructures for high performance supercapacitor electrode materials

“…Among all ECs available, supercapacitors (SCs) have attracted considerable interest because of their outstanding power capability, long cycling stability, rapid charge-discharge time, excellent energy efficiency, and safety. [4][5][6] SCs can be used in many applications, such as memory back-up, hybrid electrochromic devices (vehicles), and solid-state sensors. 7 Depending on the energy storage process (reactions), SCs can be separated into two parts: electrical double layer capacitors (EDLCs) and faradaic based pseudocapacitors (PCs).…”