Fig. 2: Structure and electrical generation performance of i-eMEH.
From: Interfacial ion-electron conversion enhanced moisture energy harvester
a Schematic diagram of i-eMEH. PSS is the polystyrene sulfonic acid doped with sulfuric acid. b, c SEM images of MoS2 and MnO2 electrodes, respectively. d Optical image of the cross-section of rc-PSS layer. The PSS/I layer is colored by the addition of methyl orange. All the colors are actual colors. e VOC-time curves (top) and ISC-time curves (bottom) of MEHg (black line), MEHM (red line), and i-eMEH (blue line). MEHg is the moisture energy harvester based on PSS sandwiched between graphite electrode, and MEHM is the moisture energy harvester based on PSS sandwiched between MoS2 electrode and MnO2 electrode. f The output charge of i-eMEH under continuous output and quasi-continuous output for 200,000 s when loaded 47 Ω resistor, as well as the charge storage utmost of i-eMEH. The VOC-time (g) and ISC-time curves (h) of i-eMEH. Insets show the enlarged details of the VOC-time and ISC-time curves. The inset axes share the units of the main figures. i The energy-time curves of i-eMEH under continuous output and quasi-continuous output with 47 Ω load resistor. Inset shows the enlarged energy-time curve under quasi-continuous output. The inset axes share the units of the main figure. j The contribution of increased capacitance and faradic process on ISC and accumulated charge at 80,000 s. k The relation between power density and load resistance. l The performance comparison chart of i-eMEH in relation to other moisture-enabled electric generators and hydrovoltaic devices. Pmax is calculated from VOC × ISC, and the P47 Ω is the power density with 47 Ω loaded resistance. The points correspond to Supplementary Table 1. The electrical output was tested under 95%RH. All the experiment results were repeated independently at least three times.
