Performance‐Enhanced and Washable Triboelectric Air Filter Based on Polyvinylidene Fluoride/UiO‐66 Composite Nanofiber Membrane

Abstract

Applying triboelectric nanogenerators (TENGs) in air filtration systems to generate electric charges through friction is a major advancement in air cleaning technology. The performance of triboelectric air filter strongly depends on the properties of triboelectric materials. In this work, a better triboelectric material, polyvinylidene fluoride (PVDF)/UiO‐66 composite nanofiber membrane (P6‐NFM), is designed and fabricated through electrospinning technology by doping UiO‐66 into PVDF matrix. As the weight ratio of UiO‐66 increases to 1%, PVDF/UiO‐66 composite nanofiber‐based TENG (P6‐TENG) achieves the maximum current, voltage, and triboelectric charge of 4.29 µA, 52.8 V, and 22.02 nC, which are 6.5 times, 5.1 times, and 8.0 times as large as those of pure PVDF‐based TENG (P‐TENG). Therefore, the triboelectric air filter based on P6‐NFM can be easily charged by slapping the fiber membrane and spun‐bond fabric. After charging, the removal efficiency of P6‐NFM is 92% for PM0.5 and 98% for PM2.5, which are 2.8 and 1.2 times those of the uncharged one. More importantly, the filtration efficiency of this air filter keeps stable after the membrane is washed four times. This method of loading UiO‐66 on the triboelectric fiber material shows tremendous potential in self‐charging and reusable air purification applications.

High-performance multifunctional electrospun fibrous air filter for personal protection: A review

“…Polar materials with high dipole moment can spontaneously arrange to form permanent dipoles under the influence of electric field, so as to induce dipole charge, which is more stable than space charge [99] . At present, many materials have been electrospun into induced dipole charge air filters, such as polyacrylonitrile (PAN), polybenzimidazole (PBI), PVDF and so on [100] , [101] , [102] . Lee et al reported electrospun PBI nanofibrous membrane with high electric dipole moment (6.12 D), as shown in Fig.…”

Biomimetic Fibrous Leaf-Vein Membrane Enabling Unidirectional Water Penetration and Effective Antibacterial PM Filtration

“…As is known, the interception efficiency of filters depends on the fineness, packing density, and thickness of stacking fibers . Due to the micrometer-scale fineness, most traditional fibrous filter materials (e.g., melt-blown fibrous filter, , spun-bond fibrous filter, fibrous aerogel filter, fibrous vacuum assembly filter, electrospinning fibrous filter − ) present disadvantages of a densely packed network and high base weight that cost a considerable breathing resistance (>170 Pa). For example, nonwoven fabrics with self-assembled nanofibers on the surface achieved 89.69% filtration efficiency against PM 2.5 , whereas the material’s pressure drop exceeded 300 Pa .…”

MXene/Multiwalled Carbon Nanotube/Polymer Hybrids for Tribopiezoelectric Nanogenerators

“…2,3 Next-generation wearable portable electronic devices need to be lightweight, flexible, breathable, humidity resistance, washable, and durable to meet practicality and aesthetics. 4,6,7 However, some difficulties are still encountered in building energy systems for wearable electronics. 2,5 From economic and environmental perspectives, drawing power directly from the environment is ideal for future wearable electronics.…”

“…The use of low-power (from milliwatts to microwatts) wearable portable electronic devices to replace traditional battery-powered portable devices is gradually becoming the future trend of flexible electronics . In this information age, wearable portable electronic devices are generally combined with artificial intelligence, big data, and the Internet of Things in the fields of health monitoring, big data collection, soft robotics, and virtual reality. , Next-generation wearable portable electronic devices need to be lightweight, flexible, breathable, humidity resistance, washable, and durable to meet practicality and aesthetics. ,, However, some difficulties are still encountered in building energy systems for wearable electronics. , From economic and environmental perspectives, drawing power directly from the environment is ideal for future wearable electronics. Fiber-based nanogenerators can convert biomechanical energy into electrical energy and are wearable, breathable, comfortable, flexible, robust, and mass-producible.…”