BiFeO₃ and Bi/BiFeO₃ cubic microcrystals were synthesized in this work. The phase, microstructure, optical and photo electrochemical properties, as well as the photocatalytic activities in photocatalytic hydrogen generation were investigated. X‐ray diffraction (XRD) and X‐ray photoelectron spectroscopy (XPS) results demonstrate the successful synthesis of BiFeO₃ and Bi/BiFeO₃. The scanning electron microscope (SEM), transmission electron microscopy (TEM), and energy‐dispersive X‐ray (EDX) results give the evidence of cubic morphology and the deposition of metal Bi on the surface of BiFeO₃. The absorption spectra show that Bi/BiFeO₃ has longer absorption edge and stronger absorption capability to visible light. The photocurrent curves, emission spectra, and electrochemical impedance spectroscopy (EIS) spectra demonstrate that Bi/BiFeO₃ has higher efficiency of electron‐hole separation and charge transfer, as well as longer lifetime of the charge carriers. These benefit to the enhancement of activity in photocatalytic hydrogen generation.

中文翻译：

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BiFeO3和Bi / BiFeO3立方微晶的合成及光催化活性

在这项工作中合成了BiFeO ₃和Bi / BiFeO ₃立方微晶。研究了相，微观结构，光学和光电化学性质以及在光催化制氢中的光催化活性。X射线衍射（XRD）和X射线光电子能谱（XPS）结果表明成功合成了BiFeO ₃和Bi / BiFeO ₃。扫描电子显微镜（SEM），透射电子显微镜（TEM）和能量分散X射线（EDX）结果提供了立方形态和BiBi在BiFeO ₃表面沉积的证据。吸收光谱表明Bi / BiFeO ₃具有更长的吸收边缘，对可见光的吸收能力更强。光电流曲线，发射光谱和电化学阻抗谱（EIS）光谱表明，Bi / BiFeO ₃具有更高的电子-空穴分离和电荷转移效率，以及更长的载流子寿命。这些有益于增强光催化制氢的活性。