In this study, novel and low-cost tungsten oxide/carbon nanotubes-graphite-polyvinyl chloride (WO₃/CNTs-graphite-PVC) film with porous 3D network structure and excellent mechanical strength is introduced as an appropriate positive electrode for vanadium redox flow battery (VRFB). The porous WO₃/CNTs-graphite-PVC film was easily obtained via uniform adding of Zn nanoparticles (ZnNPs) into bulk structure of CNTs-graphite-PVC composite and then treatment in H₂SO₄ solution for dissolving of ZnNPs and finally electrodeposition of WO₃. Electrochemical investigations revealed an excellent electrocatalytic performance towards the [VO]²⁺/[VO₂]⁺ redox reaction for the porous WO₃/CNTs-graphite-PVC film in contrast to porous CNTs-graphite-PVC, porous WO₃/graphite-PVC, and non-porous WO₃/CNTs-graphite-PVC films. The excellent electrochemical activity of porous WO₃/CNTs-graphite-PVC film comes from its high porosity and synergistic effect between CNTs with high electrical conductivity and WO₃ with high electrocatalytic nature.

Graphical abstract

在这项研究中，新型且低成本的氧化钨/碳纳米管-石墨-聚氯乙烯（WO ₃ / CNTs-石墨-PVC）膜具有多孔3D网络结构和优异的机械强度，被引入作为钒氧化还原流的合适正极电池（VRFB）。通过将Zn纳米颗粒（ZnNPs）均匀添加到CNTs-石墨-PVC复合材料的本体结构中，然后在H ₂ SO ₄溶液中处理以溶解ZnNPs并最终电沉积，可以轻松获得WO ₃ / CNTs-石墨-PVC多孔膜。 WO ₃。电化学研究表明，其对[VO] ²⁺ / [VO ₂ ] ⁺具有出色的电催化性能。与多孔CNTs-石墨-PVC膜，多孔WO ₃ /石墨-PVC和无孔WO ₃ / CNTs-石墨-PVC膜相比，多孔WO ₃ / CNTs-石墨-PVC膜的氧化还原反应。WO ₃ / CNTs-石墨-PVC多孔膜的优异电化学活性归因于其高孔隙率以及高电导率的CNT与高电催化性的WO ₃之间的协同作用。

图形概要