Defective Zr-Fumarate MOFs Enable High-Efficiency Adsorption Heat Allocations

Abstract

Adsorption-driven heat transfer devices incorporating an efficient “adsorbent–water” working pair are attracting great attention as a green and sustainable technology to address the huge global energy demands for cooling and heating. Herein, we report the improved heat transfer performance of a defective Zr fumarate metal–organic framework (MOF) prepared in a water solvent (Zr-Fum HT). This material exhibits an S-shaped water sorption isotherm (P/P 0 = 0.05–0.2), excellent working capacity (0.497 mLH2O mL–1 MOF) under adsorption-driven cooling/chiller working conditions (T adsorption(ads) = 30 °C, T condensation (con) = 30 °C, and T desorption(des) = 80 °C), very high coefficient of performances for both cooling (0.83) and heating (1.76) together with a relatively low driving temperature at 80 °C, a remarkable heat storage capacity (423.6 kW h m–3 MOF), and an outstanding evaporation heat (343.8 kW h m–3 MOF). The level of performance of the resultant Zr-Fum HT MOF is above those of all existing benchmark water adsorbents including MOF-801 previously synthesized in the N,N-dimethylformamide solvent under regeneration at 80 °C which is accessible from the solar source. This is coupled with many other decisive advantages including green synthesis and high proven chemical and mechanical robustness. The microscopic water adsorption mechanism of Zr-Fum HT at the origin of its excellent water adsorption performance was further explored computationally based on the construction of an atomistic defective model online with the experimental data gained from a subtle combination of characterization techniques.

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

“…AHT system typically operates under a full cycle of water adsorption/desorption. Incorporating the efficient “adsorbent-water“ working pair, AHT devices can operate through the endothermic process of water evaporation or exothermic process of water adsorption 29 . Adsorption-driven heating can thus operate with the released heat of adsorption ( Q ads ) and condensation ( Q cond ).…”

Understanding the stability and structural properties of ordered nanoporous metals towards their rational synthesis

“…In addition, further insight into the catalytic performance would be gained by that analysis. The expected defective nature of ONMs, as well as their use along with supported catalysts, would induce strain and more diversity of sites, which could incorporate richness into their catalytic and sorption performance, as has been observed in some nanostructured materials [84,85]. These are new avenues that remain open for future work.…”

Metal organic framework/polyelectrolyte composites for water vapor sorption applications

“…The chosen MOFs MIL-101(Cr), aluminum fumarate (Basolite® A520), MIL-53-TDC, zirconium fumarate, and UiO-66 were all well-investigated for their water sorption behavior before as noted in the given references. 34,67,[70][71][72][73][74] A brief structure description of these MOFs is given in the ESI, Table S2. † In the selected MOFs, the diameter of windows through which small molecules can penetrate the framework does not exceed 0.8-1.6 nm.…”