Improving atmospheric water production yield: Enabling multiple water harvesting cycles with nano sorbent

R. Li, Y. Shi, M. Wu, S. Hong, P. Wang
Nano Energy, Volume 67, p. 104255, (2020)

Improving atmospheric water production yield: Enabling multiple water harvesting cycles with nano sorbent

Keywords

Atmospheric water harvesting, Nanocapsule, Vapor sorbent, Photothermal material

Abstract

​Clean water shortage has long been a challenge in remote and landlocked communities especially for the impoverished. Atmospheric water is now considered as an unconventional but accessible fresh water source and sorption-based atmospheric water generator (AWG) has been successfully demonstrated a reliable way of harvesting atmospheric water. The water vapor sorbents with high water uptake capacity and especially fast vapor sorption/desorption kinetics have become the bottleneck to a desirable clean water productivity in AWG. In this work, we developed a new nano vapor sorbent composed of a nano carbon hollow capsule with LiCl inside the void core. The sorbent can capture water vapor from ambient air as much as 100% of its own weight under RH 60% within 3 h and quickly release the sorbed water within just half hour under 1 kW/m2 sunlight irradiation. A batch-mode AWG device was able to conduct 3 sorption/desorption cycles within 10 h during one day test in the outdoor condition and produced 1.6 kgwater/kgsorbent. A prototype of continuous AWG device was designed, fabricated, and successfully demonstrated, hinting a possible way of large-scale deployment of AWG for practical purposes.

Code

DOI:10.1016/j.nanoen.2019.104255

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