Portable room-temperature self-powered/active H2 sensor driven by human motion through piezoelectric screening effect

Room-temperature high H2 sensing has been realized from SnO2/ZnO nanoarray nanogenerator. Without any external electricity power source, the portable device can be self-powered under the driving of human motion. Such a behavior can be attributed to the coupling of the piezoelectric screening effect of ZnO nanowires and the conversion of SnO2/ZnO heterojunctions.