Onset Potential Shift of Water Oxidation in the Metastable Phase Transformation Process of β-Fe2O3,Energy & Fuels

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Onset Potential Shift of Water Oxidation in the Metastable Phase Transformation Process of β-Fe2O3
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-08-24 , DOI: 10.1021/acs.energyfuels.2c01812
Ningsi Zhang ₁ , Yongsheng Guo ₁ , Huiting Huang ₁ , Shicheng Yan ₁ , Zhaosheng Li _{1,

2} , Zhigang Zou _{1,

2}

Affiliation

Metastable iron oxide (β-Fe₂O₃) has attracted wide attention in photoelectrochemical water splitting as a result of its ideal light absorption capacity and theoretical saturation photocurrent. However, the poor crystallinity and high concentration of defects of β-Fe₂O₃ prepared by the traditional method resulted in a high onset potential in photoelectrochemical water splitting. This work proved that γ-Fe₂O₃ can be converted into β-Fe₂O₃ under heating, which exploits a new synthetic route for β-Fe₂O₃. β-Fe₂O₃ obtained by this phase transformation method has a smaller particle size and better crystallinity, resulting in a significant reduction in defects. The β-Fe₂O₃ photoanode exhibits an onset potential below 0.8 V_RHE, which is the lowest data thus far. This discovery breaks through the limited synthesis methods of β-Fe₂O₃, thereby reducing the obstacles of preparing β-Fe₂O₃ photoelectrodes.

中文翻译：

β-Fe2O3亚稳态相变过程中水氧化的起始电位位移

亚稳态氧化铁（β-Fe ₂ O ₃）由于其理想的光吸收能力和理论饱和光电流在光电化学水分解中引起了广泛关注。_{然而，传统方法制备的β-Fe 2} O ₃结晶度差，缺陷浓度高，导致光电化学水分解的起始电位较高。这项工作证明了γ-Fe ₂ O ₃在加热下可以转化为β-Fe ₂ O _{3 ，为β-Fe}₂ O ₃的合成开辟了一条新途径。β-Fe ₂ O ₃通过这种相变方法获得的颗粒尺寸更小，结晶度更好，从而显着减少了缺陷。β-Fe ₂ O ₃光阳极的起始电位低于 0.8 V _RHE，这是迄今为止的最低数据。这一发现突破了β-Fe ₂ O ₃有限的合成方法，从而减少了制备β-Fe ₂ O ₃光电极的障碍。

更新日期：2022-08-24

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