28 research outputs found
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A Mechanistic Analysis of Phase Evolution and Hydrogen Storage Behavior in Nanocrystalline Mg(BH4)2 within Reduced Graphene Oxide.
Magnesium borohydride (Mg(BH4)2, abbreviated here MBH) has received tremendous attention as a promising onboard hydrogen storage medium due to its excellent gravimetric and volumetric hydrogen storage capacities. While the polymorphs of MBH-alpha (Ī±), beta (Ī²), and gamma (Ī³)-have distinct properties, their synthetic homogeneity can be difficult to control, mainly due to their structural complexity and similar thermodynamic properties. Here, we describe an effective approach for obtaining pure polymorphic phases of MBH nanomaterials within a reduced graphene oxide support (abbreviated MBHg) under mild conditions (60-190 Ā°C under mild vacuum, 2 Torr), starting from two distinct samples initially dried under Ar and vacuum. Specifically, we selectively synthesize the thermodynamically stable Ī± phase and metastable Ī² phase from the Ī³-phase within the temperature range of 150-180 Ā°C. The relevant underlying phase evolution mechanism is elucidated by theoretical thermodynamics and kinetic nucleation modeling. The resulting MBHg composites exhibit structural stability, resistance to oxidation, and partially reversible formation of diverse [BH4]- species during de- and rehydrogenation processes, rendering them intriguing candidates for further optimization toward hydrogen storage applications
OxideāBased SolidāState Batteries: A Perspective on Composite Cathode Architecture
The garnet-type phase LiLaZrO (LLZO) attracts significant attention as an oxide solid electrolyte to enable safe and robust solid-state batteries (SSBs) with potentially high energy density. However, while significant progress has been made in demonstrating compatibility with Li metal, integrating LLZO into composite cathodes remains a challenge. The current perspective focuses on the critical issues that need to be addressed to achieve the ultimate goal of an all-solid-state LLZO-based battery that delivers safety, durability, and pack-level performance characteristics that are unobtainable with state-of-the-art Li-ion batteries. This perspective complements existing reviews of solid/solid interfaces with more emphasis on understanding numerous homo- and heteroionic interfaces in a pure oxide-based SSB and the various phenomena that accompany the evolution of the chemical, electrochemical, structural, morphological, and mechanical properties of those interfaces during processing and operation. Finally, the insights gained from a comprehensive literature survey of LLZOācathode interfaces are used to guide efforts for the development of LLZO-based SSBs
The Solvation Structure of Mg Ions in Dichloro Complex Solutions from First-Principles Molecular Dynamics and Simulated Xāray Absorption Spectra
The knowledge of Mg solvation structure
in the electrolyte is requisite
to understand the transport behavior of Mg ions and their dissolution/deposition
mechanism at electrolyte/electrode interfaces. In the first established
rechargeable Mg-ion battery system [D. Aurbach et al. <i>Nature</i> <b>2000</b>, <i>407</i>, 724], the electrolyte is
of the dichloro complex (DCC) solution family, MgĀ(AlCl<sub>2</sub>BuEt)<sub>2</sub>/THF, resulting from the reaction of Bu<sub>2</sub>Mg and EtAlCl<sub>2</sub> with a molar ratio of 1:2. There is disagreement
in the literature regarding the exact solvation structure of Mg ions
in such solutions, i.e., whether Mg<sup>2+</sup> is tetra- or hexacoordinated
by a combination of Cl<sup>ā</sup> and THF. In this work, theoretical
insight into the solvation complexes present is provided based on
first-principles molecular dynamics simulations (FPMD). Both Mg monomer
and dimer structures are considered in both neutral and positively
charged states. We found that, at room temperature, the Mg<sup>2+</sup> ion tends to be tetracoordinated in the THF solution phase instead
of hexacoordinated, which is the predominant solid-phase coordination.
Simulating the X-ray absorption spectra (XAS) at the Mg K-edge by
sampling our FPMD trajectories, our predicted solvation structure
can be readily compared with experimental measurements. It is found
that when changing from tetra- to hexacoordination, the onset of X-ray
absorption should exhibit at least a 1 eV blue shift. We propose that
this energy shift can be used to monitor changes in the Mg solvation
sphere as it migrates through the electrolyte to electrolyte/electrode
interfaces and to elucidate the mechanism of Mg dissolution/deposition
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Runaway Carbon Dioxide Conversion Leads to Enhanced Uptake in a Nanohybrid Form of Porous Magnesium Borohydride.
Leveraging molecular-level controls to enhance CO2 capture in solid-state materials has received tremendous attention in recent years. Here, a new class of hybrid nanomaterials constructed from intrinsically porous Ī³-Mg(BH4 )2 nanocrystals and reduced graphene oxide (MBHg) is described. These nanomaterials exhibit kinetically controlled, irreversible CO2 uptake profiles with high uptake capacities (>19.9 mmol g-1 ) at low partial pressures and temperatures between 40 and 100 Ā°C. Systematic experiments and first-principles calculations reveal the mechanism of reaction between CO2 and MBHg and unveil the role of chemically activated, metastable (BH3 -HCOO)- centers that display more thermodynamically favorable reaction and potentially faster reaction kinetics than the parent BH4 - centers. Overall, it is demonstrated that size reduction to the nanoscale regime and the generation of reactive, metastable intermediates improve the CO2 uptake properties in metal borohydride nanomaterials
Probing the mechanism of CO2 capture in diamine-appended metal-organic frameworks using measured and simulated X-ray spectroscopy.
International audienceDiamine-appended metal-organic frameworks display great promise for carbon capture applications, due to unusual step-shaped adsorption behavior that was recently attributed to a cooperative mechanism in which the adsorbed CO2 molecules insert into the metal-nitrogen bonds to form ordered ammonium carbamate chains [McDonald et al., Nature, 2015, 519, 303]. We present a detailed study of this mechanism by in situ X-ray absorption spectroscopy and density functional theory calculations. Distinct spectral changes at the N and O K-edges are apparent upon CO2 adsorption in both mmen-mg(2)(dobpdc) and mmen-Mn-2(dobpdc), and these are evaluated based upon computed spectra from three potential adsorption structures. The computations reveal that the observed spectral changes arise from specific electronic states that are signatures of a quasi-trigonal planar carbamate species that is hydrogen bonded to an ammonium cation. This eliminates two of the three structures studied, and confirms the insertion mechanism. We note the particular sensitivity of X-ray absorption spectra to the insertion step of this mechanism, underpinning the strength of the technique for examining subtle chemical changes upon gas adsorption
Runaway Carbon Dioxide Conversion Leads to Enhanced Uptake in a Nanohybrid Form of Porous Magnesium Borohydride.
Leveraging molecular-level controls to enhance CO2 capture in solid-state materials has received tremendous attention in recent years. Here, a new class of hybrid nanomaterials constructed from intrinsically porous Ī³-Mg(BH4 )2 nanocrystals and reduced graphene oxide (MBHg) is described. These nanomaterials exhibit kinetically controlled, irreversible CO2 uptake profiles with high uptake capacities (>19.9 mmol g-1 ) at low partial pressures and temperatures between 40 and 100 Ā°C. Systematic experiments and first-principles calculations reveal the mechanism of reaction between CO2 and MBHg and unveil the role of chemically activated, metastable (BH3 -HCOO)- centers that display more thermodynamically favorable reaction and potentially faster reaction kinetics than the parent BH4 - centers. Overall, it is demonstrated that size reduction to the nanoscale regime and the generation of reactive, metastable intermediates improve the CO2 uptake properties in metal borohydride nanomaterials
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Probing the mechanism of COā capture in diamine-appended metal-organic frameworks using measured and simulated X-ray spectroscopy.
Diamine-appended metal-organic frameworks display great promise for carbon capture applications, due to unusual step-shaped adsorption behavior that was recently attributed to a cooperative mechanism in which the adsorbed CO2 molecules insert into the metal-nitrogen bonds to form ordered ammonium carbamate chains [McDonald et al., Nature, 2015, 519, 303]. We present a detailed study of this mechanism by in situ X-ray absorption spectroscopy and density functional theory calculations. Distinct spectral changes at the N and O K-edges are apparent upon CO2 adsorption in both mmen-Mg2(dobpdc) and mmen-Mn2(dobpdc), and these are evaluated based upon computed spectra from three potential adsorption structures. The computations reveal that the observed spectral changes arise from specific electronic states that are signatures of a quasi-trigonal planar carbamate species that is hydrogen bonded to an ammonium cation. This eliminates two of the three structures studied, and confirms the insertion mechanism. We note the particular sensitivity of X-ray absorption spectra to the insertion step of this mechanism, underpinning the strength of the technique for examining subtle chemical changes upon gas adsorption
Cooperative adsorption of carbon disulfide in diamine-appended metal-organic frameworks.
Over one million tons of CS2 are produced annually, and emissions of this volatile and toxic liquid, known to generate acid rain, remain poorly controlled. As such, materials capable of reversibly capturing this commodity chemical in an energy-efficient manner are of interest. Recently, we detailed diamine-appended metal-organic frameworks capable of selectively capturing CO2 through a cooperative insertion mechanism that promotes efficient adsorption-desorption cycling. We therefore sought to explore the ability of these materials to capture CS2 through a similar mechanism. Employing crystallography, spectroscopy, and gas adsorption analysis, we demonstrate that CS2 is indeed cooperatively adsorbed in N,N-dimethylethylenediamine-appended M2(dobpdc) (Mā=āMg, Mn, Zn; dobpdc4-ā=ā4,4'-dioxidobiphenyl-3,3'-dicarboxylate), via the formation of electrostatically paired ammonium dithiocarbamate chains. In the weakly thiophilic Mg congener, chemisorption is cleanly reversible with mild thermal input. This work demonstrates that the cooperative insertion mechanism can be generalized to other high-impact target molecules
Cooperative Adsorption of Carbon Disulfide in Diamine-Appended Metalā Organic Frameworks
Over one million tons of carbon disulfide are produced globally each year for an array of applications, and emissions of this highly volatile and toxic liquid, known to generate acid rain, remain poorly controlled. As such, materials capable of reversibly capturing this commodity chemical in an energy-efficient manner are of interest. Recently, we detailed a family of diamine-appended metalāorganic frameworks capable of selectively capturing carbon dioxide through a cooperative insertion mechanism that promotes efficient adsorptionādesorption cycling. We therefore sought to explore the fundamental ability of these materials to capture CS2 through a similar mechanism. Employing crystallography, spectroscopy, and gas adsorption analysis, we demonstrate that CS2 is indeed cooperatively adsorbed in N,N-dimethylethylenediamine-appended M2(dobpdc) (M = Mg, Mn, Zn; dobpdc4ā = 4,4ā²-dioxidobiphenyl-3,3ā²-dicarboxylate), via the formation of electrostatically paired ammonium dithiocarbamate chains. Notably, in the weakly thiophilic Mg congener, chemisorption is cleanly reversible with mild thermal input. Importantly, this work demonstrates that the hitherto CO2-specific cooperative insertion mechanism can be generalized to other high-impact target molecules.</p