In situ NMR study on the interaction between LiBH 4-Ca(BH 4) 2 and mesoporous scaffolds

Hyun Sook Lee; Son Jong Hwang; Hoon Kee Kim; Young Su Lee; Jinsol Park; Jong Sung Yu; Young Whan Cho

doi:10.1021/jz301199y

In situ NMR study on the interaction between LiBH ₄-Ca(BH ₄) ₂ and mesoporous scaffolds

Hyun Sook Lee, Son Jong Hwang, Hoon Kee Kim, Young Su Lee, Jinsol Park, Jong Sung Yu, Young Whan Cho

Department of Energy and Science and Engineering

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

We discuss the use of nuclear magnetic resonance (NMR) spectroscopy to investigate the physical state of the eutectic composition of LiBH ₄-Ca(BH ₄) ₂ (LC) infiltrated into mesoporous scaffolds and the interface effect of various scaffolds. Eutectic melting and the melt infiltration of mixed borohydrides were observed through in situ NMR. In situ and ex situ NMR results for LC mixed with mesoporous scaffolds indicate that LiBH ₄ and Ca(BH ₄) ₂ exist as an amorphous mixture inside of the pores after infiltration. Surprisingly, the confinement of the eutectic LC mixture within the mesopores is initiated below the melting temperature, which indicates a certain interaction between the borohydrides and the mesoporous scaffolds. The confined borohydrides remain inside of the pores after cooling. These phenomena were not observed in microporous or nonporous materials, and this observation highlights the importance of the pore structure of the scaffolds. Such surface interactions may be associated with a faster dehydrogenation of the nanoconfined borohydrides.

Original language	English
Pages (from-to)	2922-2927
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	3
Issue number	20
DOIs	https://doi.org/10.1021/jz301199y
State	Published - 18 Oct 2012

Keywords

Energy Conversion and Storage
Energy and Charge Transport

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title = "In situ NMR study on the interaction between LiBH 4-Ca(BH 4) 2 and mesoporous scaffolds",

abstract = "We discuss the use of nuclear magnetic resonance (NMR) spectroscopy to investigate the physical state of the eutectic composition of LiBH 4-Ca(BH 4) 2 (LC) infiltrated into mesoporous scaffolds and the interface effect of various scaffolds. Eutectic melting and the melt infiltration of mixed borohydrides were observed through in situ NMR. In situ and ex situ NMR results for LC mixed with mesoporous scaffolds indicate that LiBH 4 and Ca(BH 4) 2 exist as an amorphous mixture inside of the pores after infiltration. Surprisingly, the confinement of the eutectic LC mixture within the mesopores is initiated below the melting temperature, which indicates a certain interaction between the borohydrides and the mesoporous scaffolds. The confined borohydrides remain inside of the pores after cooling. These phenomena were not observed in microporous or nonporous materials, and this observation highlights the importance of the pore structure of the scaffolds. Such surface interactions may be associated with a faster dehydrogenation of the nanoconfined borohydrides.",

keywords = "Energy Conversion and Storage, Energy and Charge Transport",

author = "Lee, {Hyun Sook} and Hwang, {Son Jong} and Kim, {Hoon Kee} and Lee, {Young Su} and Jinsol Park and Yu, {Jong Sung} and Cho, {Young Whan}",

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T1 - In situ NMR study on the interaction between LiBH 4-Ca(BH 4) 2 and mesoporous scaffolds

AU - Lee, Hyun Sook

AU - Hwang, Son Jong

AU - Kim, Hoon Kee

AU - Lee, Young Su

AU - Park, Jinsol

AU - Yu, Jong Sung

AU - Cho, Young Whan

PY - 2012/10/18

Y1 - 2012/10/18

N2 - We discuss the use of nuclear magnetic resonance (NMR) spectroscopy to investigate the physical state of the eutectic composition of LiBH 4-Ca(BH 4) 2 (LC) infiltrated into mesoporous scaffolds and the interface effect of various scaffolds. Eutectic melting and the melt infiltration of mixed borohydrides were observed through in situ NMR. In situ and ex situ NMR results for LC mixed with mesoporous scaffolds indicate that LiBH 4 and Ca(BH 4) 2 exist as an amorphous mixture inside of the pores after infiltration. Surprisingly, the confinement of the eutectic LC mixture within the mesopores is initiated below the melting temperature, which indicates a certain interaction between the borohydrides and the mesoporous scaffolds. The confined borohydrides remain inside of the pores after cooling. These phenomena were not observed in microporous or nonporous materials, and this observation highlights the importance of the pore structure of the scaffolds. Such surface interactions may be associated with a faster dehydrogenation of the nanoconfined borohydrides.

AB - We discuss the use of nuclear magnetic resonance (NMR) spectroscopy to investigate the physical state of the eutectic composition of LiBH 4-Ca(BH 4) 2 (LC) infiltrated into mesoporous scaffolds and the interface effect of various scaffolds. Eutectic melting and the melt infiltration of mixed borohydrides were observed through in situ NMR. In situ and ex situ NMR results for LC mixed with mesoporous scaffolds indicate that LiBH 4 and Ca(BH 4) 2 exist as an amorphous mixture inside of the pores after infiltration. Surprisingly, the confinement of the eutectic LC mixture within the mesopores is initiated below the melting temperature, which indicates a certain interaction between the borohydrides and the mesoporous scaffolds. The confined borohydrides remain inside of the pores after cooling. These phenomena were not observed in microporous or nonporous materials, and this observation highlights the importance of the pore structure of the scaffolds. Such surface interactions may be associated with a faster dehydrogenation of the nanoconfined borohydrides.

KW - Energy Conversion and Storage

KW - Energy and Charge Transport

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JF - Journal of Physical Chemistry Letters

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ER -

In situ NMR study on the interaction between LiBH ₄-Ca(BH ₄) ₂ and mesoporous scaffolds

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Keywords

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