Nano-MOFs have advantages such as functionalized pore surfaces, adjustable geometric configurations, and adjustable pore size, which make them widely applicable in fields such as adsorption, catalysis, hydrogen storage, and solar energy conversion. However, the poor stability and conductivity of Nano-MOFs seriously limits their development. Recently, nano-MOF composites have been effectively improved by introducing or modifying functional groups, metals, and non-metals with good stability and conductivity. The morphology of the Nano-MOF composites has a significant impact on the performance of the assembled capacitors. Hollow MOFs can effectively improve the penetration of electrolytes and diffusion rate of electrons and ions during electrochemical reactions. Exploring methods for constructing complex-component hollow Nano-MOF composites is important. Increasing the strength of the metal–ligand coordination bonds can effectively enhance the thermal stability of Nano-MOFs. Transition-metal phosphides have advantages such as good chemical stability, superior conductivity, excellent theoretical specific capacitance, and high abundance. Nano-MOF/polymetallic phosphide composites can effectively address the poor conductivity of MOF composite materials. The use of MOFs as sacrificial templates to directly calcine and oxidize Nano-MOF and transition-metal phosphides is a feasible strategy.
Recently, Professor Pang Huan's team published a paper in Advanced Materials entitled“Stabilizing Ni2+ in Hollow Nano MOF/Polymetallic Phosphides Composites for Enhanced Electrochemical Performance in 3D-printed Micro-Supercapacitors”. The first author is Zhou Huijie, a doctoral student.
In this study, Nano-MOF composites were used as the precursor, A partial phosphate strategy was used to control the morphology (Fig. 1). The effects of temperature, calcination gas, and metal doping on the morphologies of the Nano-MOF composites were explored. The XANES characterization results showed that the Ni–N structure remained in the composite even after the phosphating process. A NiCo bimetallic phosphide composite (VZNP) synthesized using this strategy exhibited a high specific capacitance. This approach involves synthesizing bimetallic phosphide composites through multivalent metal doping and calcination, effectively enhancing the structural stability of the Nano-MOF composites, generated by calcination and phosphorization, during the oxidation–reduction reactions. This method advances the construction of multifunctional MOF electrode materials and enhances their potential for advanced applications.
Fig.1 Material synthesis diagram
Article information: Huijie Zhou, Shunyu Gu, Yibo Lu, Guangxun Zhang, Fei Dou, Shuai Cao, Qian Li, Yangyang Sun, Mohsen Shakouri, Huan Pang*, Stabilizing Ni2+ in Hollow Nano MOF/Polymetallic Phosphides Composites for Enhanced Electrochemical Performance in 3D‐Printed Micro‐Supercapacitors. Adv. Mater. 2024, 2401856. DOI: 10.1002/adma.202401856.
Paper link: https://doi.org/10.1002/adma.202401856.
