fig3

Figure 3. (A) Schematic diagram of self-supported hierarchical porous amorphous FeNiCo-based bifunctional catalysts. (Reproduced with permission^[55]. Copyright 2021, Elsevier). (B) TEM and (C) HRTEM image of MoS_x@NCNFs-30 films. (Reproduced with permission^[56]. Copyright 2016, Elsevier). (D) HRTEM diagram of amorphous CoO_x nanoparticles (The insert shows its SAED patterns); (E-G) Free energy diagram for the water oxidation on Co₃O₄, CoOOH, and 1D-CoOx surfaces. (Reproduced with permission^[57]. Copyright 2017, WILEY-VCH). (H) TEM image and SAED pattern (inset) of CoB@TiO₂ nanosheets; (I) NH₃ yields and FE at given potentials. (Reproduced with permission^[59]. Copyright 2022, CCS).