Chemical Transformation Induced Core-Shell Ni₂P@Fe₂P Heterostructures toward Efficient Electrocatalytic Oxygen Evolution.

The corresponding Tafel plots ( Figure 4 c) show a decreasing trend in Tafel slope from Ni 2 P (64.56 mV dec −1 ), NiFe-LDH (52.97 mV dec −1 ), Fe 2 P (40.58 mV dec −1 ) to Fe 2 P@Ni 2 P (32.91 mV dec −1 ), demonstrating the faster OER kinetics for the Fe 2 P@Ni 2 P electrode, which may be ascribed to the modulated electronic structure of metal active sites according to the LSV and XPS results.

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