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Title: An asymmetric hygroscopic structure for moisture-driven hygro-ionic electricity generation and storage.
Authors: Zhang, Yaoxin 
Guo, Shuai
Yu, Zhi Gen
Qu, Hao 
Sun, Wanxin
Yang, Jiachen
Suresh, Lakshmi 
Zhang, Xueping 
Koh, J Justin 
Tan, Swee Ching 
Keywords: ambient moisture
asymmetric structure
energy generation and storage
hygro-ionic conversion
hygroscopic hydrogel
Issue Date: 25-Mar-2022
Publisher: Wiley
Citation: Zhang, Yaoxin, Guo, Shuai, Yu, Zhi Gen, Qu, Hao, Sun, Wanxin, Yang, Jiachen, Suresh, Lakshmi, Zhang, Xueping, Koh, J Justin, Tan, Swee Ching (2022-03-25). An asymmetric hygroscopic structure for moisture-driven hygro-ionic electricity generation and storage.. Advanced Materials : e2201228-. ScholarBank@NUS Repository.
Abstract: The interactions between moisture and materials give rise to the possibility of moisture-driven energy generation (MEG). Current MEG materials and devices only establish this interaction during water sorption in specific configurations, and conversion is eventually ceased by saturated water uptake. This paper reports an asymmetric hygroscopic structure (AHS) that simultaneously achieves energy harvesting and storage from moisture absorption. The AHS is constructed by the asymmetric deposition of a hygroscopic ionic hydrogel over a layer of functionalized carbon. Water absorbed from the air creates wet-dry asymmetry across the AHS and hence an in-plane electric field. The asymmetry can be perpetually maintained even after saturated water absorption. The absorbed water triggers the spontaneous development of an electrical double layer (EDL) over the carbon surface, which is termed a hygro-ionic process, accounting for the capacitive properties of the AHS. A peak power density of 70 μW cm-3 was realised after geometry optimisation. The AHS showed the ability to be recharged either by itself owing to a self-regeneration effect or via external electrical means, which allows it to serve as an energy storage device. In addition to insights into moisture-material interaction, AHSs further shows potential for electronics powering in assembled devices. This article is protected by copyright. All rights reserved.
Source Title: Advanced Materials
ISSN: 0935-9648
DOI: 10.1002/adma.202201228
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