Sulfate radicals (SO₄⁻) with broad pH tolerance and strong oxidation capacity are promising for Fenton-like reaction degradation of phenolic waste water. Ni-based catalysts and its compounds have been seldom reported as catalysts for the sulfate radical activation from persulfates (PDS) due to its inappropriate redox potential windows. A secondary battery inspired NiO nanosheets with rich Ni(III) defects were developed for Fenton-like catalysis via the charge/discharge process of NiO_x/NiO_x(OH)_y redox cycle. The redox potential of Ni(II)/Ni(III) in NiO_x/NiO_x(OH)_y cycle is high enough to activate S₂O₈²⁻ for the generation of SO₄⁻. The Fenton-like performance of the defect-rich NiO nanosheets is most robust among the well-known sulfate radical activation catalysts of Co₃O₄, α-Fe₂O₃, MnOOH, and CuO. The enhancement effect of NiO was attributed to the formed Ni(III) defects, which could facilitate the discharge process of Ni(III) to Ni(II) and then enhance the Ni(III)/Ni(II) cycle during the Fenton-like process. The stability and recovery of defect-rich NiO nanosheets was also studied. Its high stability in chemical structure contributed to the low Ni leaching during the reaction process in basic or neutral condition. The recovery of defect-rich NiO nanosheets could be easily realized via the annealing treatment. In all, the secondary battery inspired defect-rich NiO nanosheets with outstanding sulfate radical activation would be a promising Fenton-like catalyst for environmental remediation.

硫酸根（SO ₄ ^- ）具有广泛的pH耐受性较强的氧化能力是有希望的的酚醛废水类芬顿反应降解。镍基催化剂及其化合物因其不合适的氧化还原电位窗口而很少被报道为过硫酸盐（PDS）活化硫酸根的催化剂。通过NiO _x / NiO _x（OH）_y氧化还原循环的充电/放电过程，开发了具有富Ni（III）缺陷的二次电池启发的NiO纳米片，用于Fenton类催化。Ni（II）/ Ni（III）在NiO _x / NiO _x（OH）_y循环中的氧化还原电势足以激活S ₂ O₈ ^2-对的产生SO ₄ ^- 。芬顿状富缺陷的NiO纳米片的性能是Co的公知的硫酸根活化催化剂中最坚固的₃ ö ₄，的α-Fe ₂ ö ₃，MnOOH和CuO。NiO的增强作用归因于所形成的Ni（III）缺陷，它可以促进Ni（III）向Ni（II）的放电过程，然后增强Fenton期间的Ni（III）/ Ni（II）循环。像过程。还研究了富缺陷的NiO纳米片的稳定性和回收率。其化学结构的高稳定性有助于在碱性或中性条件下反应过程中的低Ni浸出。通过退火处理，可以容易地实现富缺陷的NiO纳米片的回收。总而言之，具有出色的硫酸根自由基活化作用的二次电池启发的富含缺陷的NiO纳米片将成为有希望的类似于Fenton的环境修复催化剂。