In situ transformation of Fe-doped Ni12P5 into low-crystallized NiFe2O4 with high-spin Fe4+ for efficient electrocatalytic water oxidation

Ultrafine Fe-doped Ni₁₂P₅ nanoparticles anchored on cotton-derived P-doped porous carbon were synthesized, exhibiting excellent OER activity, owing to the in situ transformation of Fe-doped Ni₁₂P₅ into low-crystallized NiFe₂O₄ with high-spin Fe⁴⁺.