Particulate matter (PM) pollution demands air filters that combine high efficiency with low pressure drop. Here, we report a self-powered electrostatic filter based on an electrospun cationic microfiber web of Chimassorb 944 (C-fiber). The C-fiber functions as a triboelectric nanogenerator (TENG), generating a surface charge density of 85.8 μC/m2 when paired with polytetrafluoroethylene (PTFE), which creates a strong electrostatic field for capturing sub-micron particles, including the most penetrating particle size (MPPS). As a result, the triboelectrically charged C-fiber filter maintains >80% filtration efficiency at a high wind speed of 60 cm/s, far exceeding uncharged mechanical filters (<20%) while retaining low air resistance. Kelvin probe force microscopy (KPFM) visualizes the surface-potential change after particle capture, and the gradual decay of TENG output provides a built-in indicator of dust loading. This strategy offers a promising platform for next-generation smart air purification systems.

1. Introduction 
2. Experimental 
    2.1 Fabrication of C-fiber Filters 
    2.2 Fabrication of C-fiber Filters Based on TENG 
    2.3 The PM Filtration Efficiency performance of C-fiber 
    2.4 Characterization and Measurements 
3. Results and Discussion 
    3.1 Fabrication of Chimassorb 944-based Microfiber Web 
    3.2 Characterization of Chimassorb 944 Fiber Web 
    3.3 Triboelectric Output Performance of C-fiber-based TENG 
    3.4 Verification of Triboelectric Polarity and Reproducibility 
    3.5 Performance Evaluation of C-fiber-based Electrostatic Filter 
    3.6 Microscopic and Macroscopic Investigation of Electrostatic Filtration Mechanism 
4. Conclusion 
Funding
Conflict of Interest 
Data Availability Statement 
Author Information and Contribution 
Acknowledgments
References

• Tae-hyung Kim(Korea Institute of Limestone and Advanced Materials, Danyang-gun, Chungcheongbuk-do, 27000, Republic of Korea)
• Jin-Kyeom Kim(Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA) Corresponding author