Stability of the LiBH4/CeH2 composite system determined by dynamic pcT measurements

Title
Stability of the LiBH4/CeH2 composite system determined by dynamic pcT measurements
Authors
Philippe MauronMichael BielmannArndt RemhofAndreas Zuttel심재혁조영환
Keywords
Hydrogen storage; Complex metal hydride; LiBH4; CeH2; Ball milling; Thermodynamics; PCT
Issue Date
2010-10
Publisher
The journal of physical chemistry. C, Nanomaterials and Interfaces
Citation
VOL 114, NO 39, 16801-16805
Abstract
We determined the stability of the LiBH4/CeH2 composite system by dynamic pcT (pressure, composition, temperature) measurements by using different constant hydrogen flows and by extrapolating ln(pdes/p0) linearly to equilibrium at zero flow. During desorption, the reaction 6LiBH4 + CeH2 → 6LiH + CeB6 + 10H2 occurs, leading to a theoretical hydrogen capacity of the destabilized system of 7.4 mass %. Within the model used and by applying the Van 't Hoff equation, the following thermodynamic parameters were determined for the desorption: enthalpy of reaction ΔrH = (58 ± 3) kJ mol-1 H2 and entropy of reaction ΔrS = (113 ± 4) J K-1 mol-1 H2, leading to a decomposition temperature Tdec = (240 ± 32) °C at a hydrogen pressure of p0 = 1.01325 bar, compared with ΔrH = 74 kJ mol-1 H2 and ΔrS = 115 J K-1 mol-1 H2 (Tdec = 370 °C) for pure LiBH4.1
URI
http://pubs.kist.re.kr/handle/201004/38190
ISSN
1932-7447
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KIST Publication > Article
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