本文開發一雙功能電催化劑—CoVMoS/NF，其具備優異的催化性能、合成 步驟簡單無需使用黏著劑等優勢，同時具結構重建之特性。在經歷24小時的OER （Oxygen Evolution Reaction）活化反應後，CoVMoS/NF 於電流密度 100 mA/cm² 下的過電位僅需250 mV，顯著優於商業化的RuO₂。透過利用V2O5在鹼性水溶 液中溶解析出之特性，於電催化劑創造豐富的氧缺陷，再結合Co、Ni、Mo等多 金屬間的協同作用及異質介面結構等合成策略，大幅提升其OER的催化活性。 CoVMoS/NF 同時具有OER和HER (Hydrogen Evolution Reaction)的催化性質， 應用於全電解催化水分解在電流密度100 mA/cm2之下，可以連續運作超過1000 小時，且仍保持高達97.8%之催化活性，平均電位為2.05 V，展現出優異的穩定 性。值得注意的是，CoVMoS/NF的雙功能特性，不僅提供極佳的穩定性，且能 避免於整體電催化水分解使用不同電極材料，過程中發生可能結構重建，而造成 的污染問題。此外，本文探討金屬硫化物作為預催化劑在OER過程中易發生結 構重建的現象，並分析其結構特性與催化活性之間的關係。;This study investigates the electrocatalyst CoVMoS/NF, which exhibits outstanding catalytic performance and a simple synthesis process that eliminates the need for binders. After a 24-hour OER （Oxygen Evolution Reaction） activation, CoVMoS/NF exhibited superior OER performance, achieving an overpotential of only 250 mV at a current density of 100 mA/cm², surpassing that of commercial RuO₂. The enhanced OER activity is attributed to the metal leaching of V₂O₅ in an alkaline solution, which creates abundant oxygen vacancies, along with the synergistic effects of Co, Ni, and Mo multimetals and the heterointerface structure. CoVMoS/NF also exhibits bifunctional catalytic properties for both OER and HER (Hydrogen Evolution Reaction). In overall water splitting at a current density of 100 mA/cm², the catalyst maintained 97.8% activity over 1000 hours, with an average cell voltage of 2.05 V, showing excellent stability. It is remarkable that the bifunctional catalytic CoVMoS/NF not only provides excellent stability but also prevents the potential contamination issues arising from the structural reconstruction during overall water electrolysis when using different electrode materials. Furthermore, this study investigates the phenomenon of structural reconstruction when using metal sulfides as the precatalysts during the OER process, and analyzes the correlation between the structural properties and catalytic activity.
