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He is working on High Entropy Alloys (HEAs) deposited on porous carbon subtrate to mitigate dendrite growth on carbon directly and encourage homogeneous plating. The HEA in question, a mix of Zinc, Indium, Bismuth, Lead and Tin, has a low activation energy (low overpotential) for zinc nucleation.

On top of this he applies a Nafion polymer in ethanol spray on the surface of the anode

With this setup, he does 800 cycles, at which point the cathode half cell goes bust. On that side, bromide ions are reduced to bromine gas which is complexed in solution by 1-ethyl-1-methylpyrrolidinium (represented below).

CC[N+]1(CCCC1)C

He does not use ion exchange membranes, but cheaper Daramic separators which are an industrial product used in lead batteries. The total thickness is 900 micrometers, with sub micrometer porosity.