X. Feng, S. Wang, P, Das, X.Y. Shi, S.H. Zheng, F. Zhou, J. Ning*, D. Wang, J.C. Zhang, Y. Hao, Z.-S. Wu*nbsp;

Journal of Energy Chemistry, 2022, 69, 1-8.

DOI: 10.1016/j.jechem.2021.11.012 [PDF]

Harnessing energy from the environment promotes the rapid development of micro-power generators and relevant power management modules of alternating current (AC) line-filtering to obtain a stabilized direct current (DC) output for storage and use. Micro-supercapacitors (MSCs) with miniaturized volume and high-frequency response are regarded as a critical component in filtering circuits for microscale power conversion. Here, we reported the fabrication of the wafer-sized planar MSCs (M-MSCs) based on 2D Ti₃C₂T_xMXene using a photolithography technique. The M-MSCs exhibited anareal capacitance of 153 μF cm⁻²and a frequency characteristic(f₀) of 5.6 kHzin aqueous electrolyte.Moreover, by employing suitable ionic liquid as electrolyte, the voltage window was expanded to 2 V and thef₀could be pushed to 6.6 kHz relying on the electrical double-layer mechanism and loweradsorption energywhile maintaining quasi-rectangular cyclic voltammogram curves at 5000 Vs⁻¹. Furthermore, the integrated MSCs pack was constructed and exhibited excellent rectifying ability by filtering various high-frequency 5000 Hz AC signals with different waveforms into stable DC outputs. Such ultrahigh-rate and high-voltage M-MSCs module for kHz AC line-filtering would be potentially integrated withcustomizable electronicsto realize on-chip rectifiers in high-density integrated circuit.