of TENG and wind energy, wind-driven TENG could harvest wind mechanical energy and convert it into available electric power by the mechanism of triboelectrification and electrostatic induction. [9,10] At the same time, aiming to figure out problems of safety issues and limited working time, wind-driven TENG is employed to take place of maintaining power device as a power supply unit to manufacture self-powered devices. Portable and wearable pressure sensors are of great concern for various daily applications, such as electronic skin, [11][12][13][14][15] flexible touchscreens, [16,17] medical devices [18,19] and energy harvesting devices. [20,21] Hitherto, the generally working mechanism of pressure sensor can be classified as forceinduced changes in piezoelectricity, [22,23] triboelectricity, [24,25] capacitance, [26,27] and resistivity. [28,29] Taking advantages of easy fabrication, simple structure, and a high sensitivity at low pressures (<5 kPa), resistive pressure sensors reveal great development potential and plenty of promising applications. [30] However, an external energy supply unit, such as various batteries, is essential to be used to drive pressure sensor, causing the problems of limited working time and environmental pollution. Thus, there is a strong demand for exploring a highly sensitive, self-powered, portable pressure sensor.Nowadays, a great number of functional materials, for instance, functional polymers, [31,32] carbon nanotubes, [33,34] and graphene, [30,35] have been adopted to design and fabricate Nowadays, aiming to fight against environmental pollution and energy crisis, a great amount of effort has been performed on self-powered devices. Herein, assembling a wind-driven triboelectric nanogenerator (TENG) and a pressure sensitive elastic polyimide (PI)/reduced graphene oxide (rGO) foam together, a self-powered pressure sensor system has been designed and investigated. Employing Ag nanoparticles and nylon film as electrode and vibration membrane, the TENG can generate desirable output. Meanwhile, the PI/rGO foam acts as the pressure sensitive unit. Integrating a bulk of PI/rGO foam (14 mm × 14 mm × 30 mm), the TENG could generate output voltage and current up to 130 V and 7.5 µA with an effective working area of 100 mm × 15 mm. Additionally, the as-fabricated device presents various stress sensing scopes and sensitivities, when different heights of foams are integrated on the TENG. The self-powered pressure sensor achieves a great combination between new clean energy resources and traditional pressure sensor. Pressure SensorThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.

The shortage of water resources is an enormous challenge for human society due to the increasing demand caused by the growing industry and population. Atmospheric water is an abundant and nonnegligible freshwater resource, which can be developed as a convenient approach in some water-deficient circumstances. Herein, a graphene nanocomposite foam is designed and demonstrated for harvesting water from air by the use of solar energy. The as-fabricated foam possesses a water harvesting capability of 0.23 g g −1 in a typical 2 h capture−2 h release cycle at 30% relative humidity, whereas 1.15 g g −1 at 90% relative humidity. The nanocomposite foam presents a stable water harvesting performance after 10 capture−release cycles. Endowed with low density and superelasticity, the graphene nanocomposite could be compressed and portable, which takes water harvesting system one step further to practical application and commercial production.