The device with a size of 5 cm × 5 cm can continuously power a commercial temperature and humidity sensor for 5 days (inset in Figure ), demonstrating its long-term powering capability. This semi-solid-state AWIEG shows much better output performance than most hydrovoltaic generators reported so far, as shown in Figure and Table . Particularly, it avoids the supply of bulky water sources that is required for traditional hydrovoltaic generators, showing its great potential as a portable/flexible power source for electronics and internet of things applications.