MoO<sub>3</sub> and 5% MoO<sub>3</sub>/ZnO were prepared by impregnation method using (NH<sub>4</sub>)<sub>6</sub>Mo<sub>7</sub>O<sub>24</sub>, 4...MoO<sub>3</sub> and 5% MoO<sub>3</sub>/ZnO were prepared by impregnation method using (NH<sub>4</sub>)<sub>6</sub>Mo<sub>7</sub>O<sub>24</sub>, 4H<sub>2</sub>O as precursor and ZnO as support. The prepared samples were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), infra red (FTIR) <span style="font-family:;" "="">and</span><span style="font-family:;" "=""> UV-Vis diffuse reflectance (DRS)</span><span> </span><span style="font-family:;" "="">spectroscopies and pho<span>to-electrochemistry. The XRD pattern showed that the MoO<sub>3</sub> powder treated at 700°C is a single-phase crystallizing in an orthorhombic structure with a direct optical transition </span></span><span style="font-family:;" "="">(</span><span style="font-family:;" "="">2.70 eV</span><span style="font-family:;" "="">)</span><span style="font-family:;" "="">. The hetero-junction 5% MoO<sub>3</sub>/ZnO</span><span style="font-family:;" "=""> was photo-electrochemically characterized to assess its feasibility for H<sub>2</sub> production under visible light. The capacitance potential (<i>C<sup>-</sup></i><sup>2</sup><i> f</i>(<i>E</i>)) characteristic of MoO<sub>3</sub> plotted in Na<sub>2</sub>SO<sub>4</sub>, (0.1 M) electrolyte indicates <i>n-</i>type conduction with a flat band potential of -</span><span style="font-family:;" "=""><span>0.54 V<i><sub>SCE</sub></i>. The photocatalytic activity was performed for the photoreduction of water to hydrogen under visible light illumination. The best performance occurs at pH ~ 7 with an evolved volume of 5.9 mL.</span></span>展开更多
文摘MoO<sub>3</sub> and 5% MoO<sub>3</sub>/ZnO were prepared by impregnation method using (NH<sub>4</sub>)<sub>6</sub>Mo<sub>7</sub>O<sub>24</sub>, 4H<sub>2</sub>O as precursor and ZnO as support. The prepared samples were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), infra red (FTIR) <span style="font-family:;" "="">and</span><span style="font-family:;" "=""> UV-Vis diffuse reflectance (DRS)</span><span> </span><span style="font-family:;" "="">spectroscopies and pho<span>to-electrochemistry. The XRD pattern showed that the MoO<sub>3</sub> powder treated at 700°C is a single-phase crystallizing in an orthorhombic structure with a direct optical transition </span></span><span style="font-family:;" "="">(</span><span style="font-family:;" "="">2.70 eV</span><span style="font-family:;" "="">)</span><span style="font-family:;" "="">. The hetero-junction 5% MoO<sub>3</sub>/ZnO</span><span style="font-family:;" "=""> was photo-electrochemically characterized to assess its feasibility for H<sub>2</sub> production under visible light. The capacitance potential (<i>C<sup>-</sup></i><sup>2</sup><i> f</i>(<i>E</i>)) characteristic of MoO<sub>3</sub> plotted in Na<sub>2</sub>SO<sub>4</sub>, (0.1 M) electrolyte indicates <i>n-</i>type conduction with a flat band potential of -</span><span style="font-family:;" "=""><span>0.54 V<i><sub>SCE</sub></i>. The photocatalytic activity was performed for the photoreduction of water to hydrogen under visible light illumination. The best performance occurs at pH ~ 7 with an evolved volume of 5.9 mL.</span></span>