LiBH4 nanoconfined in activated carbon nanofiber for reversible hydrogen storage. (22nd March 2015)

• Record Type: Journal Article
• Authors: Thiangviriya, Sophida; Utke, Rapee
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 11(2015)
• Page Start: 4167
• Page End: 4174
• Publication Date: 2015-03-22
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.01.144
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">New host material of activated carbon nanofiber (ACNF) prepared from carbonization and KOH activation of polyacrylonitrile (PAN)−based fibers is proposed for nanocofinement of LiBH<sub>4</sub>. Nanocofinement and homogeneous distribution of LiBH<sub>4</sub> in ACNF are confirmed. Remarkable reduction of onset and main dehydrogenation temperatures of LiBH<sub>4</sub> (Δ<italic>T</italic> = 128 and 118 °C, respectively) is obtained together with suppression of B<sub>2</sub>H<sub>6</sub> release during dehydrogenation. Inferior hydrogen content released during cycling from nanoconfined LiBH<sub>4</sub> in ACNF at 350 °C under vacuum is due to partially unconfined LiBH<sub>4</sub> and formation of stable Li<sub>2</sub>B<sub>12</sub>H<sub>12</sub> phase. However, nanoconfined LiBH<sub>4</sub> in ACNF desorbs and preserves (after three release and uptake cycles) up to 11.7 and 10.1 wt.% H<sub>2</sub> with respect to LiBH<sub>4</sub> content, respectively. Also, LiBH<sub>4</sub> can be rehydrogenated at significantly milder condition after nanoconfinement in ACNF, that is, Δ<italic>T</italic> = 250 °C and Δ<italic>p</italic>(H<sub>2</sub>) = 270 bar with respect to bulk LiBH<sub>4</sub>. It could be claimed that not only positive influence of nanoconfinement as well known and frequently reported, but also catalytic effect and good thermal conductivity of ACNF itself can probably synergistically favors hydrogen sorption kinetics of LiBH<sub>4</sub>.</p> </sec> </abstract>