• Halogen ion-incorporated β-FeOOH(X)s (X = F⁻, Cl⁻, Br⁻) were designed and fabricated successfully and showed good performance for negative electrodes of supercapacitors.

• The embedment of X⁻ caused the change of Fe–O bond length and structural distortion of β-FeOOH, which resulted in the narrow band gap and good electric conductivity.

• The presence of unexpected high valence state (3 + δ) Fe element facilitated the adsorption for SO₃²⁻ species endowing the β-FeOOH(X)s with good wettability in Na₂SO₃ electrolyte.

中文翻译：

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将卤素离子引入β-FeOOH的原理：控制电子结构和电化学性能

• 卤素离子结合β-的FeOOH（X）S（X = F ^- ，氯^- ，溴^- ），设计并成功地制备并显示出超级电容器的负极良好的性能。

• X的嵌入^-引起的Fe-O键长和β-的FeOOH，这就造成了窄带隙和良好的导电性的结构畸变的变化。

• 出乎意料的高价态（3 +  δ）Fe元素的存在促进了对带有β-FeOOH（X）s的SO ₃ ^2-物种在Na ₂ SO ₃电解质中的润湿性的吸附。