fig2
![Regulating the electrocatalytic performance for nitrogen reduction reaction by tuning the N contents in Fe<sub>3</sub>@N<sub><i>x</i></sub>C<sub>20-<i>x</i></sub> (<i>x</i> = 0~4): a DFT exploration](https://image.oaes.cc/c34e0cfd-09e1-4115-bfa7-82756240306d/jmi3032.fig.2.jpg)
Figure 2. Different adsorption structures of N2 on Fe3@C20: (A) end-on and (B) side-on configurations at Fe1 sites; and (C) end-on and (D) side-on configurations at Fe2 sites, with the unit cells marked by black lines.
Figure 2. Different adsorption structures of N2 on Fe3@C20: (A) end-on and (B) side-on configurations at Fe1 sites; and (C) end-on and (D) side-on configurations at Fe2 sites, with the unit cells marked by black lines.
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