Abstract Herein, the fundamental studies on the influence of anions, NO3− and SO42−, on the formation of nanostructured α-Fe2O3 and α-FeOOH has been reported. Interestingly, the nitrate (NO3−) endows the formation of α-Fe2O3 while sulphate (SO42−) endows the formation of α-FeOOH. Thus, the prepared α-Fe2O3 and α-FeOOH were systematically characterized by using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) and Fourier transform infrared spectroscopy (FT-IR). The SEM image reveals α-Fe2O3 and α-FeOOH were composed of microspheres and nanorods respectively. Further, the prepared α-Fe2O3 microspheres and α-FeOOH nanorods were used as potential electrocatalyst to catalyse oxygen evolution reaction (OER) where α-FeOOH nanorods were recognized as best OER catalyst with low overpotential of 333 mV at 10 mA cm−2 and stability over 20 h.

中文翻译：

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阴离子诱导氧化铁（III）（氢）氧化物微纳米结构的结构转变及其析氧反应性能研究

摘要 本文报道了阴离子 NO3- 和 SO42- 对纳米结构 α-Fe2O3 和 α-FeO​​OH 形成影响的基础研究。有趣的是，硝酸盐 (NO3-) 促成了 α-Fe2O3 的形成，而硫酸盐 (SO42-) 促成了 α-FeO​​OH 的形成。因此，通过使用粉末 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、能量色散 X 射线 (EDX) 和傅里叶变换红外光谱 (FT-IR) 系统地表征了制备的 α-Fe2O3 和 α-FeO​​OH。 ）。SEM 图像显示 α-Fe2O3 和 α-FeO​​OH 分别由微球和纳米棒组成。更多，