Seminar & Colloquium
[세미나: 11월 9일(수), 오전 11시 30분] Prof. James R Durrant, Imperial College London
Title
Electrocatalytic and photoelectrocatalytic pathways to green hydrogen: insights into reaction kinetics from optical spectroscopies
Speaker
Prof. James R Durrant, Department of Chemistry, Centre for Processable Electronics, Imperial College London
Biography
James Durrant is Professor of Photochemistry in the Department of Chemistry, Imperial College London and Sêr Cymru Solar Professor, College of Engineering, University of Swansea. His research focuses on the use of transient laser spectroscopy and optoelectronic technniques to investigate the function of new materials for sustainable energy conversion, including materials for artificial photosynthesis, organic and perovskite solar cells, organic photodetectors and electrolysis. More widely, as part of the SPECIFIC IKC, he leads the EPSRC programme grant ATIP, and at Imperial leads its Centre for Processable Electronics (the CPE). He has published over 550 research papers and 5 patents, which have been cited over 70,000 times, leading to an h-index of 140. He was elected a Fellow of the Royal Society in 2017 and appointed a Commander of the British Empire (CBE) for services to photochemistry and solar energy research in 2022.
| Date | Wednesday, November 9th, 2022
| Time | 11:30 ~
| Venue | 33동 125호 (WCU 다목적실)
[Abstract]
I will start by introducing the challenge of sustainably synthesizing fuels such as green hydrogen, and some of materials of interest for both electrocatalytic and photoelectrocatalytic systems. I will highlight in articular the key role of reaction kinetics in determining device efficiency, and how transient optical spectroscopies can provide insights into materials function. I will then go on to focus in more detail on arguably the most critical reaction for both electrocatalytic and photoelectrocatalytic systems for green hydrogen synthesis from water: the catalysis of water oxidation. The water oxidation reaction is both thermodynamically and kinetically challenging, with the overpotential required to drive this reaction often being a key determinant of device performance. I will focus on the potential of operando optical spectroelectrochemistry to determine redox state population densities and kinetics in metal oxides electrodes and photoelectrodes. This spectroelectrochemical approach is based on the idea that the redox states of most transition metal oxides are coloured, allowing the specific concentrations of each state to be tracked by their optical absorption/reflection as a function of material, applied bias, time, electrolyte etc. Such optical data can be complimentary to more widely employed electrochemical analyses such as J/V plots and Tafel analyses. In my talk I will discuss examples of the insights gained from operando spectroelectrochemistry into the design and function of a selection of materials, focusing in particular on Iridium Oxide, as well as Nickel/Iron Oxyhydroxide, electrocatalysts, and Hematite, Bismuth vanadate and Strontium Titanate photoelectrodes/photocatalysts.
| Host | 남기태 교수 (880-7094)