Khan Ibrahim, Ali Shahid, Mansha Muhammad, Qurashi Ahsanulhaq
Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia; Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia; Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
Ultrason Sonochem. 2017 May;36:386-392. doi: 10.1016/j.ultsonch.2016.12.014. Epub 2016 Dec 16.
Bismuth vanadate (BiVO) is a well-known photocatalyst due to its lower bandgap (E) and visible electromagnetic light absorption capacity. Herein, we reported the pulse ultra-sonochemical assisted hydrothermal approach to synthesize S-BiVO. For the comparison purpose, H-BiVO is also synthesized via conventional hydrothermal approach. The surface morphology of S-BiVO through scanning electron microscope (SEM) indicates condensed microarrays (MAs) having pseudo-flower shapes. The energy dispersive X-rays (EDX) spectrum also confirmed the elemental percent composition of Bi, V and O in BiVO. X-rays diffraction (XRD) pattern further confirmed the monoclinic scheelite phase of S-BiVO. Fourier transformed infrared (FTIR) spectrum showed Bi-O and Bi-V-O vibrational bands at 1382 and 1630cm, respectively. The diffuse reflectance spectroscopy (DRS) indicated absorption edge at ∼515nm, corresponds to bandgap value (E) of 2.41eV, which is suitable range for water splitting applications. The photocurrent density from water splitting under artificial 1 SUN visible light source found at 60 and 50μA/cm for S-BiVO and H-BiVO, respectively. The stability test through chronoamperometry showed that S-BiVO was more stable than H-BiVO. It can be depicted from the growth mechanism that ultrasonication played a definite role in the overall synthesis of pseudo-flower shaped S-BiVO MAs.
钒酸铋（BiVO）因其较低的带隙（E）和可见电磁光吸收能力而成为一种著名的光催化剂。在此，我们报道了采用脉冲超声化学辅助水热法合成S-BiVO。为了进行比较，还通过传统水热法合成了H-BiVO。通过扫描电子显微镜（SEM）观察到的S-BiVO的表面形态表明其具有假花形状的凝聚微阵列（MAs）。能量色散X射线（EDX）光谱也证实了BiVO中Bi、V和O的元素百分比组成。X射线衍射（XRD）图谱进一步证实了S-BiVO的单斜白钨矿相。傅里叶变换红外（FTIR）光谱显示Bi-O和Bi-V-O振动带分别位于1382和1630cm处。漫反射光谱（DRS）表明吸收边在~515nm处，对应于2.41eV的带隙值（E），这对于水分解应用来说是合适的范围。在人工1个太阳可见光源下，S-BiVO和H-BiVO的水分解光电流密度分别为60和50μA/cm²。通过计时电流法进行的稳定性测试表明，S-BiVO比H-BiVO更稳定。从生长机制可以看出，超声处理在假花形状的S-BiVO MAs的整体合成中起到了一定作用。
