Harvesting Thermal Energy and Freshwater from Air through Sorption Thermal Battery Enabled by Polyzwitterionic Gel,ACS Energy Letters

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Harvesting Thermal Energy and Freshwater from Air through Sorption Thermal Battery Enabled by Polyzwitterionic Gel
ACS Energy Letters ( IF 19.3 ) Pub Date : 2023-11-22 , DOI: 10.1021/acsenergylett.3c01836
He Shan _{1,

2} , Ziya Zeng _{1,

2} , Xinge Yang _{1,

2} , Primož Poredoš _{1,

2} , Jie Yu _{1,

2} , Zhihui Chen _{1,

2} , Ruzhu Wang _{1,

2}

Affiliation

Utilizing hygroscopic materials for water sorption and desorption from the atmosphere involves the capture, storage, and release of both water and heat. Herein, we introduce a design framework tailored for salt-embedded composite hygroscopic gels and analyze the mass-energy flow during sorption–desorption processes. Through this framework, we develop a hygroscopic gel composed of zwitterionic and nonionic chains, which exhibits a controlled salting-in effect, leading to stable salt retention, high energy density, and water sorption capacity. When integrated into a multifunctional device with three distinct flow paths, it achieves an impressive thermal storage energy density of 7779.6 kJ·kg_gel^–1, with a temperature increase ranging from 3.6–13 °C during heat release, and efficient heat storage within 90 min under mild heating at 61 °C. In water harvesting mode, the device yields a liquid water productivity of 0.97 kg_water·kg_gel^–1. This research highlights the potential of atmospheric water sorption for simultaneous thermal energy storage and water generation.

中文翻译：

通过多两性离子凝胶吸附热电池从空气中收集热能和淡水

利用吸湿材料从大气中吸水和解吸涉及水和热量的捕获、储存和释放。在这里，我们介绍了一种专为盐包埋复合吸湿凝胶定制的设计框架，并分析了吸附-解吸过程中的质量-能量流。通过这个框架，我们开发了一种由两性离子和非离子链组成的吸湿凝胶，它表现出受控的盐析效应，从而实现稳定的盐保留、高能量密度和吸水能力。当集成到具有三个不同流路的多功能装置中时，它实现了令人印象深刻的蓄热能量密度7779.6 kJ·kg _gel^–1，放热过程中温度升高3.6-13°C，并在90℃内高效蓄热。分钟在 61 °C 温和加热下。在集水模式下，该装置产生的液态水生产率为0.97 kg_水·kg _gel^–1。这项研究强调了大气吸水在同时储热和制水方面的潜力。

更新日期：2023-11-22

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