fig20

Figure 20. (A) The recent amorphous electrocatalysts in ORR. (B) Schematic of synthesis for Fe subnanocluster/3D-C. (C) Mass activity for Pt/C, Fe NP/3D-C, and Fe sub-nano-cluster/3D-C. (D) methanol tolerance tests for Fe sub-nano-cluster/3D-C. (Reproduced with permission^[173]. Copyright 2019, American Chemical Society). (E) LSV curves of as-prepared catalysts and Pt/C. (F) Computational models, O₂ adsorption configurations, and corresponding adsorption energies for FeN₄ and CuN_x-FeN₄ (X = 2,3,4). (Reproduced with permission^[106]. Copyright 2020, American Chemical Society).