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Polymer fiber filters, with their high surface area, low cost, and easy large-scale manufacturing, are widely used in air purification. These filters have been combined with various types of functional nanoparticles to endow them with electrostatic adsorption, photocatalysis, electrocatalysis, photoelectrocatalysis, or antibacterial properties, and improve their filtering performance. In this study, a summary of the research on single polymer and polymer composite filters for highly efficient air purification is presented. In single polymer filters, polar groups in the polymer chains, a rich porous structure, and electret process improve their removal capability. In polymer composite filters, metal-organic frameworks, porous particles, and electret materials as fillers improve the physical adsorption of the materials, while the use of photocatalysts, electrocatalysts, photoelectrocatalysts, and antibacterial agents as functional fillers endows the filters with additional chemical reactions for the complete degradation of gas and microorganism pollutants. Finally, the challenges that remain in the development of polymer filters for use in air purification are also discussed in terms of material type and fabrication technology. It is expected that polymer filters with tunable surface properties and multifunctions can realize highly efficient air purification with low energy consumption.

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Piezocatalysis is considered as an emerging alternative to the traditional anthraquinone oxidation process to produce hydrogen peroxide by directly converting mechanical energy into chemical energy. However, the development of low‐cost, recyclable piezocatalysts with excellent piezoelectric performance is highly desired but also challenging. Herein, phosphorous‐doped graphite phase carbon nitride (PCN) as a filler was added to polytetrafluoroethylene‐hexafluoropropylene (PVDF‐HFP), and this nonmetal composite film with porous structure and rich β phase shows enhanced piezoelectricity. The synergy effects of the matrix and filler in mutual promoting their catalytic‐relevant properties (piezoelectrical capacities and carrier densities) ensure high H2O2 production up to 668.56 μmol ⋅ gcat−1 ⋅ h−1. The randomly fluctuating electrical fields disturb the strong adsorption of the *OOH intermediate and promote its desorption and subsequently the production of H2O2. The composite film can be used multiple times and easily recycled. This work provides novel insights in the piezocatalytic processes and inspire the development of excellent piezocatalysts for practical peroxide production at the consuming locations.