Long‐Lasting Moisture Energy Scavenging in Dry Ambient Air Empowered by a Salt Concentration‐Gradient Cationic Hydrogel
Eunjong Kim, Xiaoting Ma, Jiaming Zhou, Jingyi Gao, Aohua Liu, Yu Ru, Yoonseob Kim, Seungkyu Lee, Dong‐Myeong Shin
Abstract
Abstract Converting ambient moisture into electric power is attractive as a next‐generation energy harvesting technology, serving as a countermeasure to overwhelming energy demands due to its sustainability and ubiquitous nature. However, achieving a long‐lasting and high density of electrical power generation at low humidity is challenging. Here, synergizing a water flow and an auxiliary anion migration in tandem with an embedded ion flow in a salt concentration‐gradient cationic gel, these challenges are tackled and developed a moisture‐activated electricity generator (MEG) with longevity (>50 days), low energy loss, and adequate power of 13.8 mW m −2 at low (30%) relative humidity. Witha stacking strategy with combinations of serial and parallel configurations, the electrical output of the MEG module can cover practical electric devices with a broad range of power consumption, unveiling the potential of MEG to power practical appliances sustainably and omnipresently.