“…However, we recently observed Ni migration during the EC operation of CO 2 , suggesting that the Ni(OH) x species may not be the main contributor to Ni migration. 14 Cheng et al 22 proposed a theory based on a hypothesis, that the dynamic redox of Ni, combined with the coarsening and gas transport processes, could be related to Ni migration. However, the 1D steady-state model proposed showed limitations, mainly regarding the lack of the description of the microstructure of the electrode and the consideration of the transient effect of charge transport.…”