Robust and Superhydrophobic CelluMOF Triboelectric Materials Enabled by H-Bond/Ionic Coordinations

Triboelectric nanogenerators (TENGs) enable self-powered real-time monitoring of pipeline vibration states in chemical engineering systems, providing an effective approach for intelligent operation and maintenance of critical chemical equipment. Metal-organic frameworks (MOFs) can effectively enhance the output performance of TENGs. MOFs can go beyond the original characteristics of their powder form and be customized into different shapes to adapt to the intended applications. However, MOF-based triboelectric materials are typically limited by their poor mechanical properties and high sensitivity to humidity. In this study, the H-bond/ion coordination strategy is employed to immobilize Zeolitic imidazolate framework-8 (ZIF-8) onto delignified wood, successfully designing a cellulose-MOF (CelluMOF) triboelectric material with excellent mechanical properties and superhydrophobic performances. The wood's porous structure induced directional alignment of MOFs along the pore channels, significantly improving mechanical performance. Furthermore, hydrophobic modification is performed on the material surface, achieving a contact angle of 152.6°, demonstrating outstanding humidity stability. The CelluMOF triboelectric material combines the mechanical toughness of wood with the functional properties of MOFs. A self-powered vibration sensor constructed using this material demonstrates exceptional sensitivity, achieving an average identification accuracy of 97.8% in detecting pipeline vibrations. Remarkably, it maintains stable performance even at 85% RH.