论文部分内容阅读
Thin film electrodes of the orthorhombic form of tin tungstate(a-SnWO4) were prepared using a hydrothermal method to convert thin films of WO3 in aqueous Sn Cl2.The p H dependence of the growth mechanism was identified by scanning electron microscopy(SEM) and X-ray diffraction(XRD).The XRD patterns show complete conversion of WO3(s) to SnWO4(s) at p H 1,4,and 7.SEM images reveal a morphology change from sponge-like platelets to sharp nanowires as the p H increases from 1 to 7.The a-SnWO4 thin films were reddish brown in color,and display an indirect band gap of 1.9 e V by diffuse reflectance UV–vis spectroscopy.a-SnWO4 is therefore solar-responsive,and a chopped light linear sweep voltammogram recorded under 100 m W/cm2AM1.5 simulated solar illumination in a p H 50.1 mol/L KPibuffer show a visible light response for photoelectrochemical water oxidation,producing32 m A/cm2 at 1.23 V vs.RHE.
Thin film electrodes of the orthorhombic form of tin tungstate (a-SnWO4) were prepared using a hydrothermal method to convert thin films of WO3 in aqueous Sn Cl2. The p H dependence of the growth mechanism was identified by scanning electron microscopy (SEM) and XRD patterns show complete conversion of WO3 (s) to SnWO4 (s) at p H 1,4, and 7. SEM images reveal a morphology change from sponge-like platelets to sharp nanowires as the pH increases from 1 to 7. The a-SnWO4 thin films were reddish brown in color, and display an indirect band gap of 1.9 e V by diffuse reflectance UV-vis spectroscopy. a-SnWO4 is therefore solar-responsive, and a chopped Light linear sweep voltammogram recorded under 100 m W / cm2 AM 1.5 simulated solar illumination in ap H 50.1 mol / L KPibuffer show a visible light response for photoelectrochemical water oxidation, producing 32 m A / cm2 at 1.23 V vs. RHE.