Multicomponent Metal Oxide Nanoneedles as Pseudocapacitor Electrodes

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2015-FISH-67154
There is an increasingly growing demand for power supplies and energy storage systems for practical applications such as electric vehicles. Among energy storage systems, supercapacitors are reliable due to their higher power density than batteries, higher energy density than conventional electrolytic capacitors, and a long cycle life. Therefore, designing novel electrode materials with large surface areas and high electrical conductivity is important to enhance the use of supercapacitors. Binary metal oxides, such as spinel nickel cobaltite (NiCo2O4), have attracted interest because of their low-cost, abundant resources, and environmental benignity. More importantly, they have superior electrical conductivity and higher electrochemical activity than single-component metal oxides. To increase the energy and power densities of the pseudo capacitive electrodes, single-component metal oxides combined with NiCo2O4 have been proposed; however, there are potential problems such as the fabrication procedures being complicated (multi-step), the interfaces between the heterogeneous metal oxides may reduce electron transfer, and it is unlikely to fully utilize the electroactive sites of the mixed metal oxides.

To solve these issues, Purdue University researchers have developed a multicomponent NixCoyMn1-x-y oxide with a homogenous structure for use in high performance supercapacitor applications. This arrangement exhibits a three-fold higher capacitance than that of NiCo2O4, has excellent long-term stability, and has low internal resistance. This development is advantageous due to the unique homogenous structure of the metal oxide with uniform distributions of nickel, cobalt, and manganese metals; enhanced oxidation state; and provides synergy with the different metal components, which can lead to a wide variety of applications in the supercapacitor industry in competition with batteries and in future designs of novel electrode materials.

Advantages:
-Multicomponent and homogenous
-Higher capacitance and long-term stability
-Low internal resistance with energy storage

Potential Applications:
-Supercapacitor industry
-Future designs for electrode materials
-Electric vehicles
Sep 30, 2015
Utility Patent
United States
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Apr 5, 2015
Provisional-Patent
United States
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