Sb2O3/BiVO4/WO3异质结构建及光电催化合成过氧化氢
Construction of Sb2O3/BiVO4/WO3 heterojunction for photoelectrocatalytic synthesis of hydrogen peroxide
作者单位E-mail
谢银琼 重庆师范大学化学学院, 绿色合成与应用重庆市重点实验室, 重庆 401331  
唐诗 重庆师范大学化学学院, 绿色合成与应用重庆市重点实验室, 重庆 401331  
王珊珊 重庆师范大学化学学院, 绿色合成与应用重庆市重点实验室, 重庆 401331  
连欣 重庆科技学院化学化工学院, 重庆 401331  
郭文龙 重庆师范大学化学学院, 绿色合成与应用重庆市重点实验室, 重庆 401331 gwlcqnu@cqnu.edu.cn 
刘玺 重庆师范大学化学学院, 绿色合成与应用重庆市重点实验室, 重庆 401331 xliu@cqnu.edu.cn 
摘要: 采用溶剂热法-旋涂法构建了Sb2O3/BiVO4/WO3半导体异质结,并采用X射线衍射、扫描电子显微镜、X射线光电子能谱等手段表征了其物化性质。在1.23 V(vs RHE)电位下,BiVO4/WO3的光电流密度相对于BiVO4提高了2倍。进一步复合Sb2O3之后,虽然Sb2O3/BiVO4/WO3薄膜的光电流密度有所下降,但其光电催化产H2O2的法拉第效率和产生速率得到明显提升。在1.89V(vs RHE)电位下,3c-Sb2O3/BiVO4/WO3薄膜产 H2O2的法拉第效率提高到约 19%;1c-Sb2O3/BiVO4/WO3薄膜 H2O2产生速率从约2.1 μmol·h-1·cm-2提高到约3.6 μmol·h-1·cm-2。此外,Sb2O3的复合显著提高了BiVO4/WO3电极材料的光电催化稳定性。
关键词: Sb2O3/BiVO4/WO3异质结  光电催化  氧化水反应  过氧化氢
基金项目: 重庆市自然科学基金(No.cstc2020jcyjmsxmX0735)和重庆市教委基金项目(No.KJQN202101517)资助。
Abstract: Sb2O3/BiVO4/WO3 semiconductor heterojunctions were constructed by solvothermal method and spin coating method, and X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the physical and chemical properties. The photocurrent density of BiVO4/WO3 was increased by two times compared with BiVO4 at 1.23 V (vs RHE). Although further coating with Sb2O3 decreased the photocurrent density of Sb2O3/BiVO4/WO3 film, the Faraday efficiency and production rate of H2O2 were improved. At 1.89 V (vs RHE), the Faraday efficiency of 3c-Sb2O3/BiVO4/WO3 film was enhanced to ca. 19%; the production rate of H2O2 of 1c-Sb2O3/BiVO4/WO3 film increased from ca. 2.1 to ca. 3.6 μmol·h-1·cm-2. In addition, the coating of Sb2O3 significantly improved the photoelectrocatalytic stability of BiVO4/WO3 electrode.
Keywords: Sb2O3/BiVO4/WO3 heterojunction  photoelectrocatalysis  water oxidation reaction  hydrogen peroxide
投稿时间:2022-08-16 修订日期:2022-12-17
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