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Seminar: Prof Andrew Hector - (University of Southampton) Charge storage applications of metal nitrides

Date(s): 11 April 2018
Time: 15:00 - 16:00
Location: The Arts One Lecture Theatre and Foyer, Mile End Campus
Details:
Professor Andrew Hector
Professor Andrew Hector
Metal nitrides have been examined fairly extensively as charge storage electrode materials. In supercapacitors their high electronic conductivity results in high charge/ discharge rate capability while surface oxidation provides redox capacity. In lithium batteries they typically act as conversion electrodes, with formation of the metal plus lithium nitride during reduction and reformation of the metal nitride on oxidation.

We published the first paper on a metal nitride in a sodium cell in 2013, where we showed that nickel nitride had a capacity and cycle life in the low potential region that was comparable with the best negative electrode materials available at the time. Since then we have shown higher capacities and good cycling stability in manganese and copper nitride. In tin nitride we have maintained the good stability but achieved a doubling of the capacity.

We have been exploring the use of titanium nitride as a conductive coating for battery materials using a non-oxide sol-gel method to efficiently coat particle surfaces. This results in improved performance in a range of positive and negative electrode materials.

We are also working on applications of metal nitrides in aqueous supercapacitors, where we have examined the effects of surface treatments on capacitance and trialled a number of materials.

In this talk I will discuss a range of relevant synthesis methods and the charge storage properties of a range of metal nitride materials.


Bio
Professor Andrew Hector is Professor of Inorganic Chemistry within the Electrochemistry Group at the University of Southampton. After degrees at Imperial College and UCL, Andrew Hector carried out postdoctoral work in solid state chemistry (metal oxyfluorides) and battery materials (high oxidation state oxides) in Southampton. He was a Royal Society URF developing metal nitride sol-gel chemistry from 2000-2008 and was then appointed as a lecturer, followed by promotions to senior lecturer (2011) and professor (2015). He is an inorganic materials chemist but a member of the historic Electrochemistry Group within Southampton Chemistry, reflecting a strong electrochemical bias on the materials he works with. He has maintained a long-standing interest in making metal nitrides and applies these in charge storage, catalysis and electrocatalysis. He is also active in oxide chemistry, both porous systems for use as electrodeposition hosts and electroceramic materials, and is involved in a number of collaborative projects around metal chalcogenides.

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