Green moisture-electric generator based on supramolecular hydrogel with tens of milliamp electricity toward practical applications

Abstract Moisture-electric generators (MEGs) has emerged as promising green technology to achieve carbon neutrality in next-generation energy suppliers, especially combined with ecofriendly materials. Hitherto, challenges remain for MEGs as direct power source in practical applications due to low and intermittent electric output. Here we design a green MEG with high direct-current electricity by introducing polyvinyl alcohol-sodium alginate-based supramolecular hydrogel as active material. A single unit can generate an improved power density of ca. 0.11 mW cm −2 , a milliamp-scale short-circuit current density of ca. 1.31 mA cm −2 and an open-circuit voltage of ca. 1.30 V. Such excellent electricity is mainly…

• RG
  Research Grants Council, University Grants Committee

  Awards: 15201419E, 15201922E, 15203421E
• IA
  Innovation and Technology Commission

  Award: MRP/020/21
• HK
  Hong Kong Polytechnic University

  Award: No.847A
• SU
  Sichuan University
• UO
  University of Science and Technology of China