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Mg(BH4)2-Based Hybrid Metal–Organic Borohydride System Exhibiting Enhanced Chemical Stability in Melt

Journal Article · · ACS Applied Energy Materials
 [1];  [2];  [1];  [3];  [4];  [4];  [5]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  5. National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
+ Show Author Affiliations
The formation of a chemically stable and thermally cyclable Mg(BH4)2 melt is proven to be possible through the utilization of an organic borohydride salt additive. While extensive exploration of additives for lowering the melting point and modifying the chemical stability of Mg(BH4)2 has been reported, this is the first study to use the organic borohydride salt, tetramethylammonium borohydride (TMAB), to modify the melting behavior of Mg(BH4)2. Here, examination of a 5:1 molar mixture of Mg(BH4)2 and TMAB revealed a reversible melt between 180 and 195 °C, which was reproduced for five thermal cycles. The mixture melt exhibited an enhanced chemical stability compared to melts of the individual Mg(BH4)2 and TMAB species. It was observed that between room temperature and 250 °C (over 50 °C above the melting point), the mixture releases <0.1 wt % mass, consisting primarily of H2. The mixture also exhibits greatly reduced evolution of volatile boron containing compounds compared to either Mg(BH4)2 or TMAB. The use of TMAB to chemically stabilize a Mg(BH4)2-rich melt demonstrated in this work represents an exciting pathway to modification of Mg(BH4)2 relevant to both hydrogen-storage and magnesium battery fields.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; AC05-76RL01830; AC36-08GO28308; NA0003525
OSTI ID:
1769882
Alternate ID(s):
OSTI ID: 1770894
OSTI ID: 1777243
Report Number(s):
NREL/JA--5K00-78638; PNNL-SA--158842
Journal Information:
ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 2 Vol. 4; ISSN 2574-0962
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

08 HYDROGEN
anions
cations
complex hydrides
hydrogen storage
magnesium batteries
magnesium borohydride
mixtures
organic borohydrides
organic reactions
physical and chemical processes