Different crystallographic Ni(OH) 2 as highly efficient Fenton-like catalysts for sulfate radical activation.

By a simple hydrothermal method, a phase boundary between α- and β-Ni(OH) can be obtained. The Fenton-like performance of α@β-Ni(OH) is 1.56 times higher than that of single β-Ni(OH). α@β-Ni(OH) displays superior stability compared to α-Ni(OH), β-Ni(OH), and amorphous Ni(OH), which makes significant contributions to developing advanced catalysts in diverse fields.