Abstract
The preparation of redox-active, ultrathin polymer films as the electrode materials represents a major challenge for miniaturized flexible electronics. Herein, we demonstrated a liquid–liquid interfacial polymerization approach to a coordination polymer films with ultrathin thickness from tri(terpyridine)-based building block and iron atoms. The as-synthesized polymer films exhibit flexible properties, good redox-active and narrow bandgap. After directly transferred to silicon wafers, the on-chip micro-supercapacitors of TpPB-Fe-MSC achieved the high specific capacitances of 1.25 mF cm−2 at 50 mV s−1 and volumetric energy density of 5.8 mWh cm−3, which are superior to most of semiconductive polymer-based micro-supercapacitor (MSC) devices. In addition, as-fabricated on-chip MSCs exhibit typical alternating current (AC) line-filtering performance (−71.3° at 120 Hz) and a short resistance–capacitance (RC) time (0.06 ms) with the electrolytes of PVA/LiCl. This study provides a simple interfacial approach to redox-active polymer films for microsized energy storage devices.
Highlights
In the past decade, electrochemical energy storage devices have drawn much attention under the fast development of nanotechnology and the demand for clean and renewable energy [1]
Polymers 2021, 13, 1002 on a Multimode Nanoscope IIIa atomic force microscope; ultraviolet-visible spectrophotometer (UV–Vis) was recorded on a Lamda 950 (PerkinElmer Co., Waltham, MA, USA); thermogravimetric analyses (TGA) was performed in nitrogen atmosphere from ambient temperature to 800 ◦ C at the rate of 20 ◦ C min−1 on a Discovery TGA550 instrument (TGA, TA, New Castle, DE, USA); The N2 adsorption/desorption sorption isotherm was measured on the Auto-sorb-iQA3200-4 sorption analyzer (Quantatech Co., Connor, NY, USA)
Starting from commercial 4-formylphenylboronic acid, the 40 -(2,20 :60,2”-terpyridine) phenylboracic acid was prepared by condensation reaction with 2-acetylpyridine, according to previous work [32]
Summary
Electrochemical energy storage devices have drawn much attention under the fast development of nanotechnology and the demand for clean and renewable energy [1]. The fabricated polymer film, with ultrathin thickness of ~300 nm, could be transferred directly to a glass for producing on-chip MSCs through the conventional approach Due to their redox properties, the as-prepared on-chip MSCs exhibit a high specific areal capacitance (1.25 mF cm−2 ) and volumetric energy density (5.8 mWh cm−3 ) at 50 mV s−1. This MSC shows a favorable AC line-filtering performance (−71.3◦ at 120 Hz) and a short relaxation time of 0.06 ms. This kind of coordination polymer film offers a new prospect toward fabrication of miniaturized electrochemical energy storage devices
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