Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Nanoscale Mg–B via Surfactant Ball Milling of MgB2: Morphology, Composition, and Improved Hydrogen Storage Properties

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [4];  [5];  [2];  [2];  [5];  [5];  [5];  [4];  [6];  [2];  [2];  [2];  [3];  [5];  [2];  [5]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Aarhus Univ. (Denmark)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  5. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  6. Indian Inst. of Technology (IIT), Gandhinagar (India)

Metal borides have attracted the attention of researchers due to their useful physical properties and unique ability to form high hydrogen-capacity metal borohydrides. We demonstrate improved hydrogen storage properties of a nanoscale Mg–B material made by surfactant ball milling MgB2 in a mixture of heptane, oleic acid, and oleylamine. Transmission electron microscopy data show that Mg–B nanoplatelets are produced with sizes ranging from 5 to 50 nm, which agglomerate upon ethanol washing to produce an agglomerated nanoscale Mg–B material of micron-sized particles with some surfactant still remaining. X-ray diffraction measurements reveal a two-component material where 32% of the solid is a strained crystalline solid maintaining the hexagonal structure with the remainder being amorphous. Fourier transform infrared shows that the oleate binds in a “bridge-bonding” fashion preferentially to magnesium rather than boron, which is confirmed by density functional theory calculations. The Mg–B nanoscale material is deficient in boron relative to bulk MgB2 with a Mg–B ratio of ~1:0.75. The nanoscale MgB0.75 material has a disrupted B–B ring network as indicated by X-ray absorption measurements. Hydrogenation experiments at 700 bar and 280 °C show that it partially hydrogenates at temperatures 100 °C below the threshold for bulk MgB2 hydrogenation. In addition, upon heating to 200 °C, the H–H bond-breaking ability increases ~10-fold according to hydrogen–deuterium exchange experiments due to desorption of oleate at the surface. This behavior would make the nanoscale Mg–B material useful as an additive where rapid H–H bond breaking is needed.

Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1670751
Alternate ID(s):
OSTI ID: 1811217
Report Number(s):
SAND--2020-4788J; 685921
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 39 Vol. 124; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (66)

Comparison shopping for a gradient-corrected density functional journal February 1996
Large-Scale Exfoliation of Inorganic Layered Compounds in Aqueous Surfactant Solutions journal July 2011
Simple, Green, and High‐Yield Production of Boron‐Based Nanostructures with Diverse Morphologies by Dissolution and Recrystallization of Layered Magnesium Diboride Crystals in Water journal February 2018
Kinetic Enhancement of Direct Hydrogenation of MgB 2 to Mg(BH 4 ) 2 upon Mechanical Milling with THF, MgH 2 , and/or Mg journal March 2019
XPS O 1s binding energies for polymers containing hydroxyl, ether, ketone and ester groups journal May 1991
Characterization of the nitridation process of boric acid journal June 1995
Potential enhancement of superconductivity in MgB2 nanosheets: First-principles calculations journal January 2014
Magnesium borohydride as a hydrogen storage material: Properties and dehydrogenation pathway of unsolvated Mg(BH4)2 journal January 2009
Recent progress in magnesium borohydride Mg(BH4)2: Fundamentals and applications for energy storage journal August 2016
Enhancement of the hydrogen release of Mg(BH4)2 by concomitant effects of nano-confinement and catalysis journal February 2019
Investigating possible kinetic limitations to MgB2 hydrogenation journal November 2019
Unexpected kinetic effect of MgB2 in reactive hydride composites containing complex borohydrides journal August 2007
Synthesis of amorphous Mg(BH4)2 from MgB2 and H2 at room temperature journal October 2010
Core level photoemission study of polycrystalline MgB2 journal August 2004
FTIR study of surfactant bonding to FePt nanoparticles journal October 2003
Mechanical milling of metal sulfide particles and their catalytic activity—hydrogenation of 1-methylnaphthalene with molybdenum sulfide journal May 1999
Degradation behavior of MgB2 superconductor journal November 2001
Nanostructured Metal Hydrides for Hydrogen Storage journal October 2018
Understanding and Mitigating the Effects of Stable Dodecahydro- closo -dodecaborate Intermediates on Hydrogen-Storage Reactions journal November 2016
Formation Mechanism of Boron-Based Nanosheet through the Reaction of MgB 2 with Water journal May 2017
Electrolyte-Assisted Hydrogen Storage Reactions journal November 2018
Analysis of the Interaction of Surfactants Oleic Acid and Oleylamine with Iron Oxide Nanoparticles through Molecular Mechanics Modeling journal March 2015
Oleylamine in Nanoparticle Synthesis journal February 2013
Boron-11 NMR spectra of boranes, main-group heteroboranes, and substituted derivatives. Factors influencing chemical shifts of skeletal atoms journal March 1992
Nanoscaled Metal Borides and Phosphides: Recent Developments and Perspectives journal June 2013
Oxide-Free, Catalyst-Coated, Fuel-Soluble, Air-Stable Boron Nanopowder as Combined Combustion Catalyst and High Energy Density Fuel journal December 2009
Three-Coordinated Boron-11 Chemical Shifts in Borates journal November 2001
Formation and Characterization of Hydrogen Boride Sheets Derived from MgB 2 by Cation Exchange journal September 2017
Reversible Storage of Hydrogen in Destabilized LiBH 4 journal March 2005
Multispectroscopic (FTIR, XPS, and TOFMS−TPD) Investigation of the Core−Shell Bonding in Sonochemically Prepared Aluminum Nanoparticles Capped with Oleic Acid journal March 2010
NMR Confirmation for Formation of [B 12 H 12 ] 2- Complexes during Hydrogen Desorption from Metal Borohydrides journal March 2008
Thermodynamic and Kinetic Characterization of Hydrogen−Deuterium Exchange in β-Phase Palladium journal September 2009
Short and Medium Range Order in Sodium Aluminoborate Glasses. 2. Site Connectivities and Cation Distributions Studied by Rotational Echo Double Resonance NMR Spectroscopy journal July 2000
Polymorphism of Two-Dimensional Boron journal April 2012
Superconductivity at 39 K in magnesium diboride journal March 2001
The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets journal April 2013
Aqueous dispersions of few-layer-thick chemically modified magnesium diboride nanosheets by ultrasonication assisted exfoliation journal June 2015
Direct hydrogenation of magnesium boride to magnesium borohydride: demonstration of >11 weight percent reversible hydrogenstorage journal January 2010
Large-scale production of two-dimensional nanosheets journal January 2012
Enhanced hydrogen desorption from Mg(BH4)2 by combining nanoconfinement and a Ni catalyst journal January 2013
Solvent-free synthesis and stability of MgB 12 H 12 journal January 2014
Metal borohydrides and derivatives – synthesis, structure and properties journal January 2017
Chelation assisted exfoliation of layered borides towards synthesizing boron based nanosheets journal January 2017
Elucidating the mechanism of MgB 2 initial hydrogenation via a combined experimental–theoretical study journal January 2017
X-ray photoemission spectroscopy of nonmetallic materials: Electronic structures of boron and BxOy journal April 2004
Preparation of Nd–Fe–B nanoparticles by surfactant-assisted ball milling technique journal April 2009
p H-dependent x-ray absorption spectra of aqueous boron oxides journal April 2011
The indirect to direct band gap transition in multilayered MoS 2 as predicted by screened hybrid density functional theory journal December 2011
Photoabsorption and photoemission of magnesium diboride at the Mg K edge journal September 2009
Sm–Co hard magnetic nanoparticles prepared by surfactant-assisted ball milling journal October 2007
The kinetic properties of Mg(BH 4 ) 2 infiltrated in activated carbon journal April 2009
Ionic Liquid Assisted Exfoliation of Layered Magnesium Diboride journal August 2017
Quantum confinement induced band gaps in MgB 2 nanosheets journal July 2016
Ab initiomolecular dynamics for liquid metals journal January 1993
Ab initio molecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germanium journal May 1994
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
X-ray photoemission study of MgB 2 journal July 2001
Effect of temperature and thermal history on borosilicate glass structure journal February 2012
The investigations of electronic structure, optical and magnetic properties of MgB2 nanosheets conference October 2014
Hydroxylation of the surface of PbS nanocrystals passivated with oleic acid journal May 2014
FT-IR Characterization of Metal Acetates in Aqueous Solution journal March 1989
Air-stable, unoxidized, hydrocarbon-dispersible boron nanoparticles journal November 2009
Ab Initio Study of the Electronic, Vibrational, and Mechanical Properties of the Magnesium Diboride Monolayer journal April 2019
Synthesis and Characterization of NIR Luminescent LaF3:Ln3+ Nanoparticles and their Transparent Epoxy Nanocomposites journal August 2013
Nd3+ sensitized Yb3+ luminescence in oleic acid functionalized LaF3: Nd3+Yb3+ nanoparticles journal May 2017

Similar Records

The influence of LiH and TiH2 on hydrogen storage in MgB2 II. XPS study of surface and near-surface phenomena
Journal Article · Tue Nov 02 00:00:00 EDT 2021 · International Journal of Hydrogen Energy · OSTI ID:1860733

Kinetic Enhancement of Direct Hydrogenation of MgB2 to Mg(BH4)2 upon Mechanical Milling with THF, MgH2, and/or Mg
Journal Article · Wed Mar 06 23:00:00 EST 2019 · ChemPhysChem · OSTI ID:1502345

The influence of LiH and TiH2 on hydrogen storage in MgB2 I: Promotion of bulk hydrogenation at reduced temperature
Journal Article · Wed Oct 27 00:00:00 EDT 2021 · International Journal of Hydrogen Energy · OSTI ID:1860734