Zhao Xiaohua, Jia Jinzhi, Shi Haixiong, Li Shanshan, Xu Cailing
School of Chemical Engineering, Lanzhou University of Arts and Science Lanzhou 730000 China
State Key Laboratory of Applied Organic Chemistry, Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University Lanzhou 730000 China.
RSC Adv. 2024 Dec 23;14(54):40173-40178. doi: 10.1039/d4ra05547k. eCollection 2024 Dec 17.
Metal-organic frameworks (MOFs) have been identified as promising electrocatalysts for the oxygen evolution reaction (OER). However, most of the reported MOFs have low electrical conductivity and poor stability, and therefore addressing these problems is crucial for achieving higher electrocatalytic performance. Meanwhile, direct observations of the electrocatalytic behavior, which is of great significance to the understanding of the electrocatalytic mechanism, remain highly challenging. Here, we report on a significant electrocatalytic performance enhancement of Co-MOF-74 for the OER after decoration by copper phthalocyanine (CuPc) molecules. Co-MOF-74@CuPc, synthesized by solvothermal reactions, displays a low overpotential of 293 mV and a robust long-term stability (70 h) at 10 mA cm. The enhancement has been attributed to strong electronic interaction between the π-conjugated CuPc molecule and Co-MOF-74, which promotes the electron transfer, increases the electrocatalytic active surface area and regulates the electronic structure during the OER process.
金属有机框架材料（MOFs）已被确认为析氧反应（OER）中很有前景的电催化剂。然而，大多数已报道的MOFs导电性低且稳定性差，因此解决这些问题对于实现更高的电催化性能至关重要。同时，对电催化行为的直接观察对理解电催化机理具有重要意义，但仍然极具挑战性。在此，我们报道了通过酞菁铜（CuPc）分子修饰后，Co-MOF-74对OER的电催化性能有显著增强。通过溶剂热反应合成的Co-MOF-74@CuPc在10 mA cm下显示出293 mV的低过电位和强大的长期稳定性（70小时）。这种增强归因于π共轭CuPc分子与Co-MOF-74之间的强电子相互作用，它促进了电子转移，增加了电催化活性表面积，并在OER过程中调节了电子结构。
