All-region-applicable, continuous power supply of graphene oxide composite
Green energy has aroused huge interest in face with increasingly serious environmental pollution and energy crisis. Herein, we develop an all-region-applicable moist-electric generator (MEG) based on graphene oxide composite to harvest energy from atmospheric moisture in a wide range of temperature (-25 oC–50 oC) and relative humidity (RH, 5%–95%). It can continuously deliver a comparatively high open-circuit voltage of ~0.6 V for more than 120 hours at ambient environment with a small device size of only about 0.1 cm–2. The electric output can be enhanced to directly power many commercial electronic devices without need of external rectifying circuits and capacitors. Experiments and simulations suggest that the spontaneous absorption of water molecules and the directional migration of ions within the composite mainly contribute to the electric generation. This work provides a new insight for generating the sustained green energy from atmospheric moisture in arbitrary ambient environments, holding immense promise for widespread practical applications in complicated geographies and environments.