BiVO₄纳米星水热制备及电化学法能带结构测定

The Hydrothermal Preparation and Electrochemical Energy Band Determination of BiVO₄ Nano-Star

摘要: 采用水热法制备了BiVO₄纳米星，并对晶体结构、形貌和光电化学性能进行了表征。结果显示制备的BiVO₄纳米星结晶性良好、形貌规则、尺寸均一，具有良好的光降解性能和光电流响应，可得到光电流密度值约为0.5 μA/cm²。采用电化学莫特–肖特基法测量了其平带电位为0.27 V vs. NHE，并定量计算了导带位置为0.25 V vs. NHE，结合光学吸收谱确定了价带位置为2.66 V vs. NHE，最后给出了BiVO₄纳米星的能级结构图。

Abstract: BiVO₄ nano-stars were prepared through a hydrothermal method, the crystal structure, morphology and optical electrochemical property were characterized. The results show that BiVO₄ nano-stars own good crystallinity, regular morphology, uniform size, as well as the good photodegradation ability and photocurrent response, and the photocurrent density of about 0.5 μA/cm². The flat band potential was measured as 0.27 V vs. NHE by electrochemical Mott-Schottky method, and the conduction band position was calculated as 0.25 V vs. NHE, and the valence band position was determined as 2.66 V vs. NHE combined with optical absorption spectrum. Finally, the energy level structure diagram of BiVO₄ nanostar was given.