Hydrogen tracer diffusion in LiBH4 measured by spatially resolved Raman spectroscopy

被引：22

作者：

Borgschulte, A. ^{[1
]}

Gremaud, R. ^{[1
]}

Lodziana, Z. ^{[1
]}

Zuettel, A. ^{[1
]}

机构：

[1] Empa, Swiss Fed Labs Mat Testing & Res, Lab 138, CH-8600 Dubendorf, Switzerland

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 19期

关键词：

POINT-DEFECT DYNAMICS; NEUTRON-SCATTERING; DEUTERIUM EXCHANGE; ALUMINUM HYDRIDES; STORAGE MATERIALS; SELF-DIFFUSION; SODIUM ALANATE; HIGH-PRESSURE; SPECTRA;

D O I：

10.1039/c000229a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The hydrogen tracer diffusion in LiBH(4) has been determined by spatially resolved Raman spectroscopy. The measurements give direct evidence of a macroscopic diffusion of BH(4)(-) ions as well as atomic exchange of hydrogen between the anions. An effective tracer diffusion coefficient of deuterium in LiBH(4) of D similar or equal to 7 x 10(-14)m(2)s(-1) at 473 K is derived. The direct exchange rate of hydrogen between BH(4) units is 10 orders of magnitude slower, i.e. the relatively fast effective hydrogen diffusion has its origin in the fast diffusion of BH(4) units.

引用

页码：5061 / 5066

页数：6

共 43 条

[1] THE LATTICE CONSTANTS OF THE ALKALI BOROHYDRIDES AND THE LOW-TEMPERATURE PHASE OF SODIUM BOROHYDRIDE [J].

ABRAHAMS, SC ;

KALNAJS, J .

JOURNAL OF CHEMICAL PHYSICS, 1954, 22 (03) :434-436

[2] Vibrational Dynamics of LiBH4 by Infrared Pump-Probe and 2D Spectroscopy [J].

Andresen, Esben Ravn ;

Gremaud, Robin ;

Borgschulte, Andreas ;

Ramirez-Cuesta, Anibal Javier ;

Zuettel, Andreas ;

Hamm, Peter .

JOURNAL OF PHYSICAL CHEMISTRY A, 2009, 113 (46) :12838-12846

[3]

[Anonymous], 2008, Hydrogen as a Future Energy Carrier

[4]

[Anonymous], 1990, CONDUCTION HEAT SOLI

[5] SELF-DIFFUSION AND HETERODIFFUSION IN CRYSTALLINE SOLID-SOLUTIONS [J].

BENIERE, F ;

BENIERE, M ;

BABU, VH ;

REDDY, KV .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1994, 55 (07) :595-604

[6] Ti-doped alkali metal aluminium hydrides as potential novel reversible hydrogen storage materials [J].

Bogdanovic, B ;

Schwickardi, M .

JOURNAL OF ALLOYS AND COMPOUNDS, 1997, 253 (1-2) :1-9

[7] Hydrogen-deuterium exchange experiments to probe the decomposition reaction of sodium alanate [J].

Borgschulte, A. ;

Zuettel, A. ;

Hug, P. ;

Barkhordarian, G. ;

Eigen, N. ;

Dornheim, M. ;

Bormann, R. ;

Ramirez-Cuesta, A. J. .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2008, 10 (27) :4045-4055

[8] Hydrogen-deuterium exchange in bulk LiBH4 [J].

Borgschulte, A. ;

Zuettel, A. ;

Hug, P. ;

Racu, A. -M. ;

Schoenes, J. .

JOURNAL OF PHYSICAL CHEMISTRY A, 2008, 112 (21) :4749-4753

[9] Hydrogen diffusion in NaH as derived from isotope exchange experiments [J].

Borgschulte, A. ;

Pendolino, F. ;

Gremaud, R. ;

Zuettel, A. .

APPLIED PHYSICS LETTERS, 2009, 94 (11)

[10]

BORGSCHULTE A, 2010, MAT RES SOC S P

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