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Next Generation Mixed Metal Transition Metal Non-Oxide Supercapacitors

詳細技術說明

None

*Abstract

BackgroundNanostructured transition metal non oxide nitrides (TMN), carbides (TMC), particularly, VN synthesized by the investigator exhibit a capacitance of 1340 F/g exceeding that of current materials of choice, carbon and RuO2 used in supercapacitors, an emerging area of electrochemistry. The high capacitance is likely due to the conducting VN core and the surface oxide formed on VN with V exhibiting multiple redox potentials. A limitation is the low to moderate surface area and the limited chemical stability of the insulator surface oxide in alkaline pH. Exploration of solid solutions of VN with other TMNs can lead to chemically stable multifunctional oxides on the nitride surface exploiting the TMs variable valence states. Superior supercapacitor response will thus be controlled by the system and the synthesis method that affects the redox chemistry, surface structure, electronic conductivity, porosity, chemical stability, and composition. Several approaches exist for synthesizing nanostructured TMNs, particularly TiN but little is known about ternary TMNs containing TMs exhibiting high surface area (HSA), displaying multi-valent states and excellent chemical stability for supercapacitors. TechnologyA novel hydrazide sol-gel (HSG) process involving the reaction of metal alkoxides with hydrazine was developed by the investigator for synthesizing HSA (~250 m2/g) nanostructured binary TMNs. The versatile approach can generate multi-component TMNs, providing an ideal test bed for studying the role of structure, composition, and microstructure on the electrochemical response of supercapacitors.ApplicationThis invention will lead to novel materials that when implemented in supercapacitors will result in signficantly improved performance which is a combination of capacitance and cycle life.Advantages1. Novel composition that will lead to chemically stable supercapacitor systems.2. The novel process will lead to nano-particles of the system exhibiting very high surface areas on the order of 250-300 m2/g.3. The novel approach will result in chemically stable systems exhibiting high surface areas.4. The electrochemical response of the system will superseed the performance of current materials namely, Carbon forms and transition metal oxides such as Ruthenium Oxides.5. Combination of the mixed metal transition metal nitrides with carbon nanotube formulations using a novel mixing methodology will lead to superior response times in comparison to current materials.Non Provisional and PCT Patent Applications filed

*Principal Investigation

Name: Prashant Kumta, Materials Science & Engineering Dept.

Department: Bioengineering

國家/地區

美國