Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5145479 | International Journal of Hydrogen Energy | 2017 | 7 Pages |
Abstract
Research on rare earth (RE) borohydrides is increasing due to their potential as possible hydrogen storage materials and as solid-state Li-ion conductors for battery applications. In this work, we report the formation of a new bimetallic RE borohydride, KEr(BH4)4, via mechanochemical reaction between KBH4 and Er(BH4)3 in a molar ratio of 1:1. Post-annealing of the ball-milled mixture at 175 °C for 12 h under 40 bar of hydrogen resulted in an almost phase pure material. KEr(BH4)4 is isostructural to NaSc(BH4)4 with lattice parameters of a = 8.4472(8) Ã
, b = 12.4292(11) Ã
, c = 9.6252(9) Ã
and space group Cmcm. An amorphization of the new bimetallic phase was observed at â¼170 °C under 1 bar argon via temperature programmed photographic analysis, which is in agreement with in situ synchrotron radiation powder X-ray diffraction (SR-PXD) as well as thermogravimetric and differential scanning calorimetry (TG-DSC). The in situ SR-PXD data did not show decomposition into the starting monometallic borohydrides.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Michael Heere, SeyedHosein Payandeh GharibDoust, Magnus H. Sørby, Christoph Frommen, Torben R. Jensen, Bjørn C. Hauback,