Photoelectrodegradation of dyes using semiconductors under visible light is currently a major research topic. In this work, copper pyrovanadate (Cu₂V₂O₇) was obtained by combustion synthesis, and the influence of different fuels such as citric acid, glycine, and urea on the properties of this semiconductor was evaluated. Using X-ray diffraction analysis, it was observed that the β-Cu₂V₂O₇ phase was formed in greater proportions for the three samples, especially with the use of urea. On the other hand, the formation of the α-Cu₂V₂O₇ phase was not verified when glycine was used, which can be associated with the occurrence of a higher flame temperature during the combustion step (1507 °C). Among the photoelectrodes obtained, the ITO/Cu₂V₂O₇-Urea presented the best photoelectrocatalytic performance, with a greater discoloration rate constant of methylene blue dye (k_obs = 28.61 × 10⁻³ min⁻¹) and less charge transfer resistance (42.75 Ω), while in the other photoelectrodes, the proportion of the β-Cu₂V₂O₇ phase was lower, as well as the discoloration rate constant. Thus, this work has contributed to demonstrate how the choice of fuel can influence the formation of the α- and β-phases of Cu₂V₂O₇ and, therefore, may promote the development of materials with greater stability and photoelectrocatalytic efficiency.

使用半导体在可见光下对染料进行光电降解是当前的主要研究课题。在这项工作中，通过燃烧合成获得了丙酮酸铜（Cu ₂ V ₂ O ₇），并评估了柠檬酸，甘氨酸和尿素等不同燃料对该半导体性能的影响。利用X射线衍射分析，观察到的是，β-Cu系₂ V ₂ ö ₇被形成了三个样品更大的比例相，尤其是使用尿素。在另一方面，所述的形成α-Cu系₂ V ₂ ö ₇当使用甘氨酸时，未验证气相相，这可能与燃烧步骤（1507°C）中较高的火焰温度有关。在所获得的光电极中，ITO / Cu ₂ V ₂ O _7-尿素表现出最佳的光电催化性能，亚甲基蓝染料的变色速率常数较大（k _obs  = 28.61×10 ^-3  min ^-1），而电荷转移阻力较小（42.75Ω），而在另一个光电极，所述的比例β-Cu系₂ V ₂ ö ₇相变色率和常数较低。因此，这项工作有助于证明燃料的选择如何影响Cu ₂ V ₂ O ₇的α相和β相的形成，从而可以促进具有更高稳定性和光电催化效率的材料的开发。