Self-powered wearable graphene fiber for information expression

Rollable, Stretchable, and Reconfigurable Graphene Hygroelectric Generators

“…Graphene oxide (GO) possesses abundant oxygen‐containing groups (e.g., COOH) and high specific surface area, allowing the excellent water molecules absorption between quasi‐2D planar structures and generating substantial ionized protons under the hydration effect . Gradient oxygen‐containing groups can be constructed in GO materials by an electric polarization method developed in our previous studies, which will induce inner ion concentration gradient and accordingly produce electricity under humidity variation. Moreover, the high mechanical tolerance and the ease of manufacturing of GO film could provide an ideal platform for construction of electricity generation device with special configuration …”

“…Gradient oxygen‐containing groups can be constructed in GO materials by an electric polarization method developed in our previous studies, which will induce inner ion concentration gradient and accordingly produce electricity under humidity variation. Moreover, the high mechanical tolerance and the ease of manufacturing of GO film could provide an ideal platform for construction of electricity generation device with special configuration …”

“…Subsequently, a high‐power laser was used to tailor the devices into highly deformable architectures based on the precise design for applications in flexible conditions (Figure c). Then, the gradient distribution of oxygen‐containing groups in GO film between cathode and anode was constructed by a moisture–electric annealing polarization process (Figure d,e; Figures S2–S6, Supporting Information), which constructs serial GHEGs with special structures . It should be noted that an effective contact‐mode polarization method is adopted in the polarization process of this work, in which one pair of Au electrodes are physically touched on laser‐induced rGO electrodes (Figure d).…”

Electric Power Generation through the Direct Interaction of Pristine Graphene‐Oxide with Water Molecules

“…Different mechanisms have been proposed to explain the origin of EPG including streaming potential, coupling effect, electron drag, charged ion drifting, and interface charging–discharging process . Based on the functional group gradient derived from the electrochemical treatment, we have recently demonstrated an EPG process by the formation of gradient ion distribution …”

“…[30][31][32] Based on the functional group gradient derived from the electrochemical treatment, we have recently demonstrated an EPG process by the formation of gradient ion distribution. [17,[33][34][35][36][37] In this work, we present a new phenomenon that pristine GO film (GOF) without any pretreatment or additives can directly produce the electric power with a V oc of up to 0.4-0.7 V and a J scc of up to 2-25 µA cm −2 under water vapor. We propose that the powergenerating process originates from the self-induced ionization and directional movement of the spontaneously released H + ions within the well-organized structure of GOF.…”