Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 2

nickel cobalt sulfide Related Abstracts

2 Mesoporous Carbon Sphere/Nickel Cobalt Sulfide Core-Shell Microspheres for Supercapacitor Electrode Material

Authors: Charmaine Lamiel, Van Hoa Nguyen, Jae-Jin Shim, Marjorie Baynosa

Abstract:

The depletion of non-renewable sources had led to the continuous development of various energy storage systems in order to cope with the world’s demand in energy. Supercapacitors have attracted considerable attention because they can store more energy than conventional capacitors and have higher power density than batteries. The combination of carbon-based material and metal chalcogenides are now being considered in response to the search for active electrode materials exhibiting high electrochemical performance. In this study, a hierarchical mesoporous carbon [email protected] cobalt sulfide ([email protected]) core-shell was synthesized using a simple hydrothermal method. The [email protected] core-shell microstructures exhibited a high capacitance of 724.4 F g−1 at 2 A g−1 in a 6 M KOH electrolyte. Good specific retention of 86.1% and high Coulombic efficiency of 97.9% was obtained after 2000 charge-discharge cycles. The electrode exhibited a high energy density of 58.0 Wh kg−1 (1440 W kg−1) and high power density of 7200 W kg−1 (34.2 Wh kg−1). The reaction involved green synthesis without further sulfurization or post-heat treatment. Through this study, a cost-effective and facile synthesis of [email protected] as an active electrode showed favorable electrochemical performance.

Keywords: Hydrothermal, electrochemical, supercapacitor, carbon sphere, nickel cobalt sulfide

Procedia PDF Downloads 114
1 Hydrothermal Synthesis of Carbon Sphere/Nickel Cobalt Sulfide Core/Shell Microstructure and Its Electrochemical Performance

Authors: Charmaine Lamiel, Van Hoa Nguyen, Jae-Jin Shim, Marjorie Baynosa

Abstract:

Electrochemical supercapacitors have attracted considerable attention because of their high potential as an efficient energy storage system. The combination of carbon-based material and transition metal oxides/sulfides are studied because they have long and improved cycle life as well as high energy and power densities. In this study, a hierarchical mesoporous carbon sphere/nickel cobalt sulfide (CS/Ni-Co-S) core/shell structure was synthesized using a facile hydrothermal method without any further sulfurization or post-heat treatment. The CS/Ni-Co-S core/shell microstructures exhibited a high capacitance of 724 F g−1 at 2 A g−1 in a 6 M KOH electrolyte. After 2000 charge-discharge cycles, it retained 86.1% of its original capacitance, with high Coulombic efficiency of 97.9%. The electrode exhibited a high energy density of 58.0 Wh kg−1 at an energy density of 1440 W kg−1, and high power density of 7200 W kg−1 at an energy density of 34.2 Wh kg−1. The successful synthesis was considered to be simple and cost-effective which supports the viability of this composite as an alternative activated material for high performance supercapacitors.

Keywords: Hydrothermal, electrochemical, supercapacitor, carbon sphere, nickel cobalt sulfide

Procedia PDF Downloads 135