Lithium‐Doped Silica‐Rich MIL‐101(Cr) for Enhanced Hydrogen Uptake

Abstract

Metal-organic frameworks (MOFs) show promising characteristics for hydrogen storagea pplication.I nt his direction, modification of under-utilized large pore cavities of MOFs has been extensively explored as ap romising strategy to further enhancet he hydrogen storage properties of MOFs. Here, we describedasimple methodology to enhance the hydrogen uptake properties of RHA incorporated MIL-101 (RHA-MIL-101,w here RHA is rice husk ash-a waste material) by controlled doping of Li + ions. The hydrogen gas uptake of Li-doped RHA-MIL-101 is significantly higher (up to 72 %) compared to the undoped RHA-MIL-101, where the content of Li + ions dopingg reatly influenced the hydrogen uptake properties. We attributed the observed enhancement in the hydrogen gas uptake of Li-dopedR HA-MIL-101 to the favorableL i + ion-to-H 2 interactions and the cooperative effect of silanol bonds of silica-rich rice-huska sh incorporated in MIL-101.[b] Dr.

Enhancement of Hydrogen Adsorption on Spray-Synthesized HKUST-1 via Lithium Doping and Defect Creation

“…While experimental work is yet to reach those levels, the results thus far have been promising. For example, Li + -doped hydroxyl-MIL-53(Al) and MIL-53(Al) improved the H 2 uptake at 77 K and 1 bar from 0.5 wt% to 1.7 wt% and from 1.66 wt% to 1.84 wt%, respectively [14,15]; Li + -exchanged NOTT-201 and MOF-5 exhibited the enhancement of H 2 uptake from 0.96 wt% to 1.02 wt% and from 1.23 wt% to 1.39 wt%, respectively [16,17]; Li + -doped MIL-101 exhibited the enhancement of H 2 uptake from 1.54 wt% to 2.65 wt% [18]. Methods for Li + doping include the reduction of the MOF skeleton via organometallic lithium [14], Li exchange with protons of hydroxyl-modified MOFs [17,19] or anionic MOFs [16], and the thermal treatment of LiNO 3 -impregnated MOFs [15,18,20].…”

“…For example, Li + -doped hydroxyl-MIL-53(Al) and MIL-53(Al) improved the H 2 uptake at 77 K and 1 bar from 0.5 wt% to 1.7 wt% and from 1.66 wt% to 1.84 wt%, respectively [14,15]; Li + -exchanged NOTT-201 and MOF-5 exhibited the enhancement of H 2 uptake from 0.96 wt% to 1.02 wt% and from 1.23 wt% to 1.39 wt%, respectively [16,17]; Li + -doped MIL-101 exhibited the enhancement of H 2 uptake from 1.54 wt% to 2.65 wt% [18]. Methods for Li + doping include the reduction of the MOF skeleton via organometallic lithium [14], Li exchange with protons of hydroxyl-modified MOFs [17,19] or anionic MOFs [16], and the thermal treatment of LiNO 3 -impregnated MOFs [15,18,20]. The thermal treatment of LiNO 3 -MOF, by which NO 3 anions in the LiNO 3 -impregnated MOF is thermal decomposed to NO and/or N 2 O gas at 200 • C [15], is preferred because Li doping can be achieved under moderate conditions compared with the other two methods.…”

Insight into the Structure of MOF‐Containing Hybrid Polymeric Microspheres

“…It can be anticipated that functionalized MOF can be one of the most powerful materials used for adsorption. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] The development of MOFs has had a significant impact on various fields of chemistry and materials science. Polymer science exploited this novel type of material for various purposes, which is due to their defined porosity, high surface area, and catalytic activity.…”

“…The adsorption process with MOF adsorbents has been considered by many researchers due to its cost‐effectiveness, excellent efficiency and the facility of operation as one of the most effective processes used for gas or liquid phase adsorption as well as environmental compatibility. It can be anticipated that functionalized MOF can be one of the most powerful materials used for adsorption [17–30] …”