fig6
![PGM-free carbon-based catalysts for the electrocatalytic oxygen reduction reaction: active sites and activity enhancement](https://image.oaes.cc/4564efdf-43c0-418c-828a-54a3c19dfeef/em3052.fig.6.jpg)
Figure 6. Models of carbon atoms with different edge structures (top) and the corresponding free energy plots (bottom). Reproduced from Xue et al.[118] by permission from Springer Nature.
Figure 6. Models of carbon atoms with different edge structures (top) and the corresponding free energy plots (bottom). Reproduced from Xue et al.[118] by permission from Springer Nature.
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