fig1
![Metal-nitrogen-carbon catalysts towards acidic ORR in PEMFC: fundamentals, durability challenges, and improvement strategies](https://image.oaes.cc/ab15714c-b740-4069-b691-0729178addb2/5483.fig.1.jpg)
Figure 1. The best metric achieved each year of PGM-free catalysts. This figure is quoted with permission from Litster et al.[15].
Figure 1. The best metric achieved each year of PGM-free catalysts. This figure is quoted with permission from Litster et al.[15].
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