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  • Instituto de Química da Unicamp
  • Rua Josué de Castro, s/n – Cidade Universitária, Campinas – SP, 13083-970.
  • (19) 3521-3000
  • (19) 3521-3023

Data

28 jun 2023
Expired!

Horário

10:00 - 18:00

Seminário

“Common challenges in electrocatalysis: from the production of green hydrogen and ammonia to batteries and back”.
Prof. Dr. Ifan Stephens (Imperial College London)

Data:   28/06 (quarta-feira)
Horário: 10h00 – Online

Resumo: Electrochemistry will play a pivotal role in our transition away from fossil fuels to a net zero society. While batteries and fuel cells are set to decarbonise transportation, electrolysers can enable the sustainable synthesis of our most coveted chemicals, such as H2 and NH3. It turns out that some of the reactions that we aim to accelerate in water electrolysis, such as H2 evolution, are exactly the reactions that we wish to inhibit in Li ion batteries and during N2 reduction. To that end, in our group we translate techniques and insight from electrosynthesis to battery science and vice versa.
I will present our mechanistic studies on the electrocatalysis of (i) O2 evolution for water electrolysis on iridium based and nickel based oxides  and  (ii) N2 reduction to NH3 on Li-based electrodes in organic electrolytes. (iii) parasitic gas evolution in Li ion batteries.
Our studies incorporate electrochemical measurements, electrochemical mass spectrometry, operando optical spectroscopy, secondary ion mass spectrometry, x-ray photoelectron spectroscopy and density functional theory; using the combination of these techniques, we build a holistic picture of the factors controlling these technologically critical reactions.

Short CV: Ifan conducted his PhD at the University of Cambridge. In 2008, Ifan moved to the Department of Physics at the Technical University of Denmark (DTU); he was first employed as a postdoctoral researcher, then as Assistant Professor and finally as Associate Professor In 2015, Massachusetts Institute of Technology (MIT) awarded Ifan the Peabody Visiting Associate Professorship. Ifan moved to the Department of Materials at Imperial College London in 2017; he currently holds the position of Reader in Electrochemistry there. His group’s research aims to enable the large-scale electrochemical conversion of renewable energy to fuels and valuable chemicals and vice versa. Such processes will be critical in order to allow the increased uptake of renewable energy.  Ifan has published 80 papers on topics including oxygen reduction, oxygen evolution, CO2 reduction and nitrogen reduction. Ifan’s research on H2O2 electrosynthesis led to the establishment of the spinout HPNow, which he co-founded. Stephens and his colleagues were awarded the 2021 Environment, Sustainability and Energy Division Horizon Prize: John Jeyes Award for their work on H2O2 production. Stephens is the recipient a Consolidator Grant from the European Research Council to investigate N2 electroreduction to NH3. As of 2022, he is on the Clarivate Highly Cited Researcher list.

Youtube:  https://www.youtube.com/live/qAkWxeiNun0

Prof. Responsável:   Ana Flávia Nogueira

The event is finished.

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