Ultrahigh-Energy-Density Sorption Thermal Battery Enabled by Graphene Aerogel-Based Composite Sorbents for Thermal Energy Harvesting from Air

Abstract

Sorption-based thermal storage has drawn considerable attention for sustainable and cost-effective thermal management and energy storage. However, the low sorption capacity of sorbents is a long-standing challenge for achieving high-energy-density sorption-based thermal storage. Herein, we demonstrate an ultrahigh-energy/power-density sorption thermal battery (STB) enabled by graphene aerogel (GA)-based composite sorbents for efficient thermal harvesting and storage with record performance. Scalable GA-based composite sorbents with high salt loading are synthesized by confined calcium chloride inside a GA matrix (CaCl 2 @GA), showing fast sorption kinetics and a large sorption capacity up to 2.89 g•g −1 contributed by the GA matrix and chemisorption−deliquescence−absorption of CaCl 2 . The STB realizes thermal charging−discharging via the multistep water desorption−sorption of CaCl 2 @GA sorbent with the humidity from air. Importantly, the lab-scale STB exhibits record energy density of 1580 Wh•kg −1 and power density of 815 W•kg −1 for space heating. Our work offers a promising low-carbon route for efficient thermal energy harvesting, storage, and utilization.

Fe–Co controlled super-hygroscopic hydrogels toward efficient atmospheric water harvesting

“…4d. Compared to silica gel, 16 carbon aerogel, 47 PAN/MIL@LiCl, 22 HMC, 48 [EMIM][Ac], 49 MOF-801, 50,51 MOF-303, 52 and HCS-LiCl, 53 our Fe–Co hydrogel possessed two major advantages associated with AWH: higher water sorption capacity and lower energy requirement for water release. This result makes the bimetal-based hydrogel applicable for efficient AWH by employing the HDH technique (hydrated to dehydrated).…”

Simultaneous atmospheric water production and 24-hour power generation enabled by moisture-induced energy harvesting

“…Nevertheless, the strong endothermic/exothermic effects of sorbents during moisture sorption/desorption need a large amount of energy consumption for addressing sorption/desorption heats, resulting in the low energy efficiency of SAWH devices 27 . To improve the overall performance of SAWH, it is highly desirable to develop efficient hybrid SAWH systems to utilize the endothermic/exothermic effects of sorbents for power generation 28 , sorption heating 29 , desorption cooling 30 , etc.…”

Flexible engineering of advanced phase change materials

“…However, these thermoregulation technologies usually restrict the mobility of the human body because of the heavy and complex wearable devices. Both the thermal regulation of human bodies and batteries can merely provide cooling or heating separately, but cooling and heating are usually simultaneously required under various conditions in many scenarios ( Chen et al., 2020f ; Ci et al., 2019 ; D'Alessandro et al., 2018 ; Waqas et al., 2018 ; Yan et al., 2021 ; Yang et al., 2021 ). In addition, thermal regulation needs to consider the diverse requirements of individuals, which can improve personal thermal comfort.…”