Phase Locking of NiOOH@β-Ni(Fe)OOH Reconstructed Simultaneously for Robust Oxygen Evolution at High Current Density

). In situ Raman spectroscopy and density functional theory (DFT) calculation demonstrate that the heterogeneous interface effectively suppresses the overcharging of β-Ni(Fe)OOH into γ-Ni(Fe)OOH through interfacial electron donation. These findings provide crucial insights into achieving phase locking and improving stability of simultaneously reconstructed heterogeneous materials, presenting a reliable pathway for the further development of efficient and durable electrocatalysts.