Bifuntional Materials Containing Preyssler‐type Polyoxometalates and Iron Phenanthroline Stabilized with Poly (Allylamine Hydrochloride) for Electrochromic Energy Storage Devices

Abstract

Electrochromic supercapacitors have received extensive attention owing to their ability to combine electrochromism and energy storage properties. In this paper, a bifunctional electrode material based on Preyssler-type tungstophosphate (P 5 W 30 ), polyelectrolyte poly(allylamine hydrochloride) chain (PAH) modified by the iron complex (Fe(phen) 3 ) was synthesized by Layer-by-Layer method (LbL). Compared with the film without PAH, the composite film displays large optical contrast (35.17 %), fast response time (2.49/0.90 s for coloring/bleaching), great coloration efficiency (94.73 cm 2 • C À 1 ) and high specific capacitance (10.45 mF cm À 2 ). Moreover, the good cycling stability (83.66 % retention of the original optical modulation after 1500 cycles, capacity retention rate is 91.46 % after 500 cycles) is achieved. In addition, the composite film is also able to visually detect the energy storage level through reversible and rapid color changes, and further use it to assemble device. This work provides an promising candidate for electrochromic and energy storage devices.

Design Strategies for High Reflectivity Contrast and Stability Adaptive Camouflage Electrochromic Supercapacitors

“…EC supercapacitors (ECSCs) are an emerging intelligent energy storage device that features bifunctional EC pseudocapacitive materials, causing a coloration change in response to different charging/discharging states, − which is promising for achieving efficient energy management and intelligent human–machine interaction. In particular, due to its excellent energy storage properties, the ECSCs can be used as an energy device to power equipment, making it highly attractive for use in outdoor environments in terms of camouflage devices. , For ECSCs, the selection and design of the ion storage layer have important impacts on the performance of the device.…”

Sea-Cucumber-like Microstructure Polyoxometalate/TiO2 Nanocomposite Electrode for High-Performance Electrochromic Energy Storage Devices

“…There is currently a dearth of research on POM-based EESDs. Recently, our research group investigated several high-performance electrochromic energy storage bifunctional composites containing saturated [ 32 ], lacunary [ 33 ], and substituted-type [ 34 ] POMs. In this study, we further developed a POM-based EESD and studied its EC and energy storage performance.…”

“…Table S1 Comparison of electrochromic and energy storage performance in this work and previous works about POMs-based and inorganic metal oxides electrodes. References [ 16 , 21 , 32 , 33 , 51 , 52 , 53 , 54 , 55 , 56 ] are cited in the Supplementary Materials.…”