fig5

Figure 5. (A) Schematic diagram of the synthesis of NiFe-PBA-gel-cal. (B) HRTEM image of NiFe-PBA-gel-cal. (Reproduced with permission^[70]. Copyright 2022, Wiley-VCH). (C) Schematic illustration of CoFe-H structure and its application in electrochemical and photo-electrochemical water oxidation as an OER electrocatalyst. (D) TEM, and (E) HRTEM images of CoFe-H nanosheets (the insert is corresponding FFT). (Reproduced with permission^[72]. Copyright 2017, WILEY-VCH). (F) The fabrication illustration of Ru SAs-MoO_3-x/NF. (G) XRD patterns of Ru SAs-MoO_3-x/NF and Ru SAs-MoO₃/NF. (Reproduced with permission^[78]. Copyright 2023, WILEY-VCH).