Radiation Synthesis of Lanthanide-Based Conductive MOFs and Their Pseudocapacitive Performance

Powder X-ray diffraction (PXRD) confirmed the successful synthesis of Ho-HHTP, while high-resolution transmission electron microscopy (HRTEM) revealed its ultrathin nanosheet-like morphology and well-defined one-dimensional channel architecture.

Cyclic voltammetry (CV) analysis showed typical symmetric redox peaks indicating dominant surface-controlled pseudocapacitive charge storage. Quantitative kinetic analysis revealed that the pseudocapacitive contribution accounted for 82.18% of the total capacitance at a scan rate of 30 mV s-1. Electrochemical measurements further demonstrated a high specific capacitance of 215.5 F g-1 at 1 A g-1, along with robust rate capability—retaining substantial capacitance even at elevated current densities.