Facile one-pot synthesis of NiCo₂Se₄-rGO on Ni foam for high performance hybrid supercapacitors

Abstract

A hybrid supercapacitor comprising a NiCo2Se4-rGO composite has been fabricated on Ni foam and shows high energy and power density and superior flexibility.

Solution-processed graphene oxide electrode for supercapacitors fabricated using low temperature thermal reduction

“…4 1,3,4,9,17,32,33,[38][39][40][41][42][43][44][45][46][47] (b) Ragone plot of the energy and power densities of SC reported over the last three years (since 2017). [48][49][50][51][52][53][54][55][56][57][58] The black solid square represents the SC made of rGO electrode reduced at very high temperature around 900 C (ref. 48) while the data for green solid circles are from of SCs with electrodes made from rGO-based nanocomposite electrodes with CNT or activated carbon.…”

“…[49][50][51][52][53] The blue solid triangles represent performances of hybrid SCs that used both electric double layer capacitance and pseudocapacitance structures. [54][55][56][57][58] The red solid star in both number of carbon atoms, and the sheet is maintained as the honeycomb structure. During the 1300 K reduction; however, oxygen contents are detached by producing not only H 2 O, H 2 O 2 , but also CO, CO 2 .…”

“…6(b) is a Ragone plot comparing the performances of the SCs including EDLC-only devices and hybrid SCs reported the last three years since 2017. [48][49][50][51][52][53][54][55][56][57][58] A Ragone plot helps in the visualization on how SCs have balanced performance in terms of their energy and power densities, which generally have a tradeoff relationship. Hence, signicant number of research works were aimed to increase both the energy and power densities of the SCs.…”

Synthesis of bimetallic nickel cobalt selenide particles for high-performance hybrid supercapacitors

“… 19 The specific capacity of reported NiCo 2 Se 4 -rGO reaches 2038.55 F g −1 at a current density of 1 A g −1 , and maintains 90% of the original capacity after 1000 cycles. 20 Liu et al designed and synthesized core–shell structure selenium-enriched bimetallic selenide balls as the battery–supercapacitor hybrid cathode electrode, the capacity of the electrode reaches 164.44 mA h g −1 at current density 1 A g −1 , and it still maintains 85.72% of the initial capacity after 5000 cycles. 21 Aside from considering the morphology effect on the electrochemical performance, control of the synergy between nickel and cobalt ions in the active material is another useful way to increase the capacitance.…”

Cobalt telluride electrocatalyst for selective electroreduction of CO2 to value-added chemicals

“…Apart from enhanced catalytic activity, these CoTe nanostructures also showed high faradaic efficiency, and longterm functional stability. Also, because of the extensive stoichiometry alterations that are possible in metal-rich chalcogenides, these materials are highly efficient, inexpensive, and robust electrocatalysts for a variety of electrochemical sensors, energy conversion, and storage applications [49][50][51][52].…”