Most of the emerging electronic devices are wearable in nature. However, the frequent changing or charging the battery of all wearable devices is the big challenge. Interestingly, with those wearable devices that are directly associated with the human body, the body can be used in transferring or generating energy in a number of techniques. One technique is triboelectric nanogenerators (TENG). This chapter covers different applications where the human body is used as a triboelectric layer and as a sensor. Wearable TENG has been discussed in detail based on four basic modes that could be used to monitor the human health. In all the discussions, the main focus is to power the wearable healthcare internet of things (IoT) sensor through human body motion based on self-powered TENG. The IoT sensors-based wearable devices related to human body can be used to develop smart body temperature sensors, pressure sensors, smart textiles, and fitness tracking sensors.

Globally, the internet of things (IoT) is a concept for the realization, integration, and updating of both the physical and digital world through the use of sensors to obtain accurate data from the environment triboelectric nanogenerators (TENG) are shown to be promising for applications involving self-powered sensors and mechanical energy harvesting. Traditional triboelectric generators harvest energy in contact mood but are not cost-effective. Therefore, in this research article, we report on the design and development of a simple, robust, cost-effective, and novel TENG, which can provide a maximum power of around 9.89 μW at an external load resistance of 85 MΩ. The fabricated TANG has a maximum open-circuit voltage of 54 V and a short circuit current of 61 μA. As a proof of concept, capacitors of different ratings were charged and 30 LEDs (Light-emitting diode) were powered up through the fabricated TENG. Output results show that the many commercial electronic devices such as a smartwatch, calculator, Remote Keyless Entry (RKE), temperature sensor, pressure sensor and so many low current operating sensors can be powered up through the fabricated self-powered triboelectric nanogenerator.