Proton exchange membrane (PEM) electrolysis is a key route to production of green hydrogen from renewable electricity. Our ambition is to establish the fundamental limits to the performance of proton exchange membrane (PEM) electrolysers and use this to develop new materials with improved properties. The anode material for PEM electrolysis is required to catalyse oxygen evolution (2H2O → O2 + 4H+ + 4e-), be relatively stable under harsh O2 evolution conditions (low pH and oxidising potentials), as well as to allow conduction of the electrons evolved in the reaction. Generally, this limits the currently viable solutions to oxides of iridium, a highly expensive and scarce element. Even Ir, which is the most stable catalyst, can dissolve from the anode and redeposit at the cathode, potentially poisoning H2 evolution and limiting PEM electrolyser lifetimes. Non precious metal oxide catalysts based on Mn corrode at much higher rates than IrOx. Research by Stephens’ group has shown that addition of stable inactive materials to the anode can conceal the undercoordinated sites (i.e. those that are most prone to dissolution), preventing dissolution without compromising activity for example, Ti on MnO2 and Ir on RuO2. Hence, it should be possible to tailor activity and stability independently of each other, provided we can identify the mechanisms controlling these two processes.
Transmission electron microscopy (TEM) is one of the few tools able to directly study a catalyst’s structure and chemistry with atomic resolution and single atom sensitivity. New in-situ capabilities developed in Manchester enable this to be done at atomic spatial resolution for solid materials when surrounded by liquid of gaseous environments
This project aims to apply new in-situ TEM imaging capabilities to understand how promotor elements prevent dissolution. The project will be based at the University of Manchester and the student will learn to use Manchester’s world leading TEM capabilities to image the structure and elemental distribution of electrode materials, in realistic conditions and during electrochemical cycling. You will develop expertise in complementary characterisation methods, and in Python analysis of large, complex data sets. You will also work closely with Stephens’ group at Imperial to apply the insights gained to design improved electrode materials. You will work as part of an interdisciplinary team, collaborate with expert scientists at bp, attend international conferences and have opportunities to undertake experiments at national and international facilities. It is expected that key results will be publishable and will lead to high impact publications in world leading journals.
Applicants should have or expect to achieve at least a 2.1 honours degree in Chemistry, Physics, Engineering or related discipline.
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