“…In addition, carrying out an operando and a multimodal analytical approach, there have been relevant experiments revealing new insights regarding degradation in nanocrystals. 154 In situ TEM has been applied with great success in neighbouring research areas such as synthesis and crystal growth, 155 heterogenous catalysis, 156 corrosion 157 and batteries. 158 On the other hand, the most recent, and groundbreaking improvements of in situ set-ups, are yet to be fully utilized for characterization of Pt-based ORR electrocatalysts at reaction conditions.…”