Diffusion‐Controlled Electrochemical Kinetics of Ti 3 C 2 T x
Bishnu Prasad Sapkota, Soham Das, Ajay Kumar, Debabrata Pradhan, Sanjib KabiABSTRACT
The structural and electrochemical performance of Ti 3 C 2 T x MXene are influenced by the etching conditions during the synthesis process. Herein, Ti 3 C 2 T x MXene was synthesized by employing different HF concentrations (20%–40%) to study the effect of etching conditions on its structural and electrochemical properties. XRD results confirmed the increase in interlayer spacing and successful exfoliation after HF etching, with MX_20 showing the highest d‐spacing and defect density. FE‐SEM analysis revealed the characteristic accordion‐like morphology of Ti 3 C 2 T x MXene, with MX_20 exhibiting the highest degree of exfoliation uniformity. EDAX and elemental mapping confirmed the successful formation of MXene samples which is in accordance with XRD inference. Raman and FT‐IR studies further confirmed structural disorder and surface functionalization of the MXene sheets. N 2 ‐BET analysis of the optimized MX_20 revealed a specific surface area of 11.60 m 2 /g. Electrochemical measurements in 1 M KOH electrolyte revealed the pseudocapacitive nature with a peak specific capacitance of 150.8 F/g at 1 A/g due to enhanced ion diffusion in the optimized sample. Warburg diffusion analysis confirmed the dominance of diffusion‐controlled electrochemical kinetics with an ion diffusion coefficient of 1.92 × 10 −10 cm 2 /s, indicating efficient ionic transport through the MXene interlayers consequential due to optimized HF etching conditions.