fig6

Figure 6. (A) Schematic of the preparation of Ni-Fe composite nanosheet array. Reproduced with permission^[66]. Copyright 2023, Royal Society of Chemistry; (B) MS/SS forming schematic diagram, image of large area electrode (1 m × 1 m) and industrial alkaline electrolyzer photograph; (C) In situ Raman spectra of MS/SS during the OER at different voltages. Reproduced with permission^[68]. Copyright 2022, Elsevier; (D) Scheme of synthesis process of la-S-NiFe-LDH/NFF. Reproduced with permission^[71]. Copyright 2024, Elsevier. MS: Metal sulfide; SS: stainless steel; OER: oxygen evolution reaction; LDH: layered double hydroxide; NFF: NiFe foam.