Flame-retardant triboelectric generator with stable thermal-mechanical-electrical coupling performance for fire Bluetooth alarm system

A novel triboelectric nanogenerators (TENG) device with energy-harvesting, safeguarding properties was developed based on the anti-impact and flame retardant elastomers (AFEs). The AFE composite was fabricated via the introduction of urea and carbon nanotubes (CNTs) into shear stiffening elastomer (SSE). The limiting oxygen index (LOI) value of 6AFE-25 (6AFE contained 25% urea) was 30.5% and could reach V-0 rating. The peak heat release rate of 6AFE-25 achieved 224.79 kW/m2, which was decreased by 29.10% compared with neat SSE. More importantly, the optimized TENG with thickness of 4 mm exhibited a maximum power of 57.25 mu W at voltage of 22.70 V which enabled to act as a wearable power source to actuate electronics. Besides, the TENG enabled to dissipate impact force from 5199 to 386 N, exhibiting a remarkable safeguarding performance. Owing to good self-healing property, the thermal-electrical-mechanical coupling performance of the reported TENG device kept stable even after cutting damage and 20 s-fire attack. Finally, a self-powered Bluetooth fire alarm system was developed which could be used in fire rescue.