Effects of two-dimension MXene Ti                         3                         C                         2                          on hydrogen storage performances of MgH                         2                         -LiAlH                         4                          composite

Gang Chen; Yao Zhang; Honghui Cheng; Yunfeng Zhu; Liquan Li; Huaijun Lin

doi:10.1016/j.chemphys.2019.03.001

Effects of two-dimension MXene Ti ₃ C ₂ on hydrogen storage performances of MgH ₂ -LiAlH ₄ composite

Gang Chen, Yao Zhang, Honghui Cheng, Yunfeng Zhu, Liquan Li, Huaijun Lin

College of Materials Science and Engineering

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

61 Scopus citations

Abstract

4MgH ₂ -LiAlH ₄ composite exhibits reduced over-high thermal stability and enhanced de/re-hydrogenation kinetics in previous work. However, de/re-hydrogenation temperatures are still higher than the requirement of mobile fuel cell system. In this case, two-dimension lamellar Ti ₃ C ₂ was introduced into the 4MgH ₂ -LiAlH ₄ composite. The de-hydrogenation onset temperature of 4MgH ₂ -LiAlH ₄ -Ti ₃ C ₂ composite is decreased by 64 K and 274 K from 4MgH ₂ -LiAlH ₄ and as-milled MgH ₂ , respectively. Its de-hydrogenation activation energy value is reduced by 47.8 kJ mol ⁻¹ from 176.2 kJ mol ⁻¹ of 4MgH ₂ -LiAlH ₄ . The re-hydrogenation activation energy (65.7 kJ mol ⁻¹ ) of 4MgH ₂ -LiAlH ₄ -Ti ₃ C ₂ is also lowered by 33.5 kJ mol ⁻¹ from 4MgH ₂ -LiAlH ₄ (99.2 kJ mol ⁻¹ ). Further study indicates that Ti ₃ C ₂ partially decomposed itself during ball milling and was completely transformed to metallic Ti and carbon during de-hydrogenation. The identified TiH _1.942 indicates that in-situ formed Ti should react with 4MgH ₂ -LiAlH ₄ system and slightly destabilize the system. For this system, de-hydrogenation enthalpies in three stages (65.9 kJ mol ⁻¹ H ₂ ⁻¹ , 70.6 kJ mol ⁻¹ H ₂ ^-1 and 74.3 kJ mol ⁻¹ H ₂ ⁻¹ , respectively) are all lower than as-milled MgH ₂ (76.2 kJ mol ⁻¹ H ₂ ⁻¹ ). It means that introducing Ti ₃ C ₂ into 4MgH ₂ -LiAlH ₄ not only improves the reaction kinetics but also lowers its over-high thermal stability.

Original language	English
Pages (from-to)	178-187
Number of pages	10
Journal	Chemical Physics
Volume	522
DOIs	https://doi.org/10.1016/j.chemphys.2019.03.001
State	Published - 1 Jun 2019

Keywords

Hydrogen storage performance
Kinetics
MgH -LiAlH composite
Thermal stability
Two-dimension lamellar Ti C

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10.1016/j.chemphys.2019.03.001

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Chen, G., Zhang, Y., Cheng, H., Zhu, Y., Li, L., & Lin, H. (2019). Effects of two-dimension MXene Ti ₃ C ₂ on hydrogen storage performances of MgH ₂ -LiAlH ₄ composite Chemical Physics, 522, 178-187. https://doi.org/10.1016/j.chemphys.2019.03.001

Chen, Gang ; Zhang, Yao ; Cheng, Honghui et al. / Effects of two-dimension MXene Ti ₃ C ₂ on hydrogen storage performances of MgH ₂ -LiAlH ₄ composite In: Chemical Physics. 2019 ; Vol. 522. pp. 178-187.

@article{8efd34681f8b47af946468e9d3387ef8,

title = " Effects of two-dimension MXene Ti 3 C 2 on hydrogen storage performances of MgH 2 -LiAlH 4 composite ",

abstract = " 4MgH 2 -LiAlH 4 composite exhibits reduced over-high thermal stability and enhanced de/re-hydrogenation kinetics in previous work. However, de/re-hydrogenation temperatures are still higher than the requirement of mobile fuel cell system. In this case, two-dimension lamellar Ti 3 C 2 was introduced into the 4MgH 2 -LiAlH 4 composite. The de-hydrogenation onset temperature of 4MgH 2 -LiAlH 4 -Ti 3 C 2 composite is decreased by 64 K and 274 K from 4MgH 2 -LiAlH 4 and as-milled MgH 2 , respectively. Its de-hydrogenation activation energy value is reduced by 47.8 kJ mol −1 from 176.2 kJ mol −1 of 4MgH 2 -LiAlH 4 . The re-hydrogenation activation energy (65.7 kJ mol −1 ) of 4MgH 2 -LiAlH 4 -Ti 3 C 2 is also lowered by 33.5 kJ mol −1 from 4MgH 2 -LiAlH 4 (99.2 kJ mol −1 ). Further study indicates that Ti 3 C 2 partially decomposed itself during ball milling and was completely transformed to metallic Ti and carbon during de-hydrogenation. The identified TiH 1.942 indicates that in-situ formed Ti should react with 4MgH 2 -LiAlH 4 system and slightly destabilize the system. For this system, de-hydrogenation enthalpies in three stages (65.9 kJ mol −1 H 2 −1 , 70.6 kJ mol −1 H 2 -1 and 74.3 kJ mol −1 H 2 −1 , respectively) are all lower than as-milled MgH 2 (76.2 kJ mol −1 H 2 −1 ). It means that introducing Ti 3 C 2 into 4MgH 2 -LiAlH 4 not only improves the reaction kinetics but also lowers its over-high thermal stability.",

keywords = "Hydrogen storage performance, Kinetics, MgH -LiAlH composite, Thermal stability, Two-dimension lamellar Ti C",

author = "Gang Chen and Yao Zhang and Honghui Cheng and Yunfeng Zhu and Liquan Li and Huaijun Lin",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = jun,

day = "1",

doi = "10.1016/j.chemphys.2019.03.001",

language = "英语",

volume = "522",

pages = "178--187",

journal = "Chemical Physics",

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Chen, G, Zhang, Y, Cheng, H, Zhu, Y , Li, L & Lin, H 2019, ' Effects of two-dimension MXene Ti ₃ C ₂ on hydrogen storage performances of MgH ₂ -LiAlH ₄ composite ', Chemical Physics, vol. 522, pp. 178-187. https://doi.org/10.1016/j.chemphys.2019.03.001

Effects of two-dimension MXene Ti ₃ C ₂ on hydrogen storage performances of MgH ₂ -LiAlH ₄ composite . / Chen, Gang; Zhang, Yao; Cheng, Honghui et al.
In: Chemical Physics, Vol. 522, 01.06.2019, p. 178-187.

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

TY - JOUR

T1 - Effects of two-dimension MXene Ti 3 C 2 on hydrogen storage performances of MgH 2 -LiAlH 4 composite

AU - Chen, Gang

AU - Zhang, Yao

AU - Cheng, Honghui

AU - Zhu, Yunfeng

AU - Li, Liquan

AU - Lin, Huaijun

PY - 2019/6/1

Y1 - 2019/6/1

N2 - 4MgH 2 -LiAlH 4 composite exhibits reduced over-high thermal stability and enhanced de/re-hydrogenation kinetics in previous work. However, de/re-hydrogenation temperatures are still higher than the requirement of mobile fuel cell system. In this case, two-dimension lamellar Ti 3 C 2 was introduced into the 4MgH 2 -LiAlH 4 composite. The de-hydrogenation onset temperature of 4MgH 2 -LiAlH 4 -Ti 3 C 2 composite is decreased by 64 K and 274 K from 4MgH 2 -LiAlH 4 and as-milled MgH 2 , respectively. Its de-hydrogenation activation energy value is reduced by 47.8 kJ mol −1 from 176.2 kJ mol −1 of 4MgH 2 -LiAlH 4 . The re-hydrogenation activation energy (65.7 kJ mol −1 ) of 4MgH 2 -LiAlH 4 -Ti 3 C 2 is also lowered by 33.5 kJ mol −1 from 4MgH 2 -LiAlH 4 (99.2 kJ mol −1 ). Further study indicates that Ti 3 C 2 partially decomposed itself during ball milling and was completely transformed to metallic Ti and carbon during de-hydrogenation. The identified TiH 1.942 indicates that in-situ formed Ti should react with 4MgH 2 -LiAlH 4 system and slightly destabilize the system. For this system, de-hydrogenation enthalpies in three stages (65.9 kJ mol −1 H 2 −1 , 70.6 kJ mol −1 H 2 -1 and 74.3 kJ mol −1 H 2 −1 , respectively) are all lower than as-milled MgH 2 (76.2 kJ mol −1 H 2 −1 ). It means that introducing Ti 3 C 2 into 4MgH 2 -LiAlH 4 not only improves the reaction kinetics but also lowers its over-high thermal stability.

AB - 4MgH 2 -LiAlH 4 composite exhibits reduced over-high thermal stability and enhanced de/re-hydrogenation kinetics in previous work. However, de/re-hydrogenation temperatures are still higher than the requirement of mobile fuel cell system. In this case, two-dimension lamellar Ti 3 C 2 was introduced into the 4MgH 2 -LiAlH 4 composite. The de-hydrogenation onset temperature of 4MgH 2 -LiAlH 4 -Ti 3 C 2 composite is decreased by 64 K and 274 K from 4MgH 2 -LiAlH 4 and as-milled MgH 2 , respectively. Its de-hydrogenation activation energy value is reduced by 47.8 kJ mol −1 from 176.2 kJ mol −1 of 4MgH 2 -LiAlH 4 . The re-hydrogenation activation energy (65.7 kJ mol −1 ) of 4MgH 2 -LiAlH 4 -Ti 3 C 2 is also lowered by 33.5 kJ mol −1 from 4MgH 2 -LiAlH 4 (99.2 kJ mol −1 ). Further study indicates that Ti 3 C 2 partially decomposed itself during ball milling and was completely transformed to metallic Ti and carbon during de-hydrogenation. The identified TiH 1.942 indicates that in-situ formed Ti should react with 4MgH 2 -LiAlH 4 system and slightly destabilize the system. For this system, de-hydrogenation enthalpies in three stages (65.9 kJ mol −1 H 2 −1 , 70.6 kJ mol −1 H 2 -1 and 74.3 kJ mol −1 H 2 −1 , respectively) are all lower than as-milled MgH 2 (76.2 kJ mol −1 H 2 −1 ). It means that introducing Ti 3 C 2 into 4MgH 2 -LiAlH 4 not only improves the reaction kinetics but also lowers its over-high thermal stability.

KW - Hydrogen storage performance

KW - Kinetics

KW - MgH -LiAlH composite

KW - Thermal stability

KW - Two-dimension lamellar Ti C

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U2 - 10.1016/j.chemphys.2019.03.001

DO - 10.1016/j.chemphys.2019.03.001

M3 - 文章

AN - SCOPUS:85062952542

SN - 0301-0104

VL - 522

SP - 178

EP - 187

JO - Chemical Physics

JF - Chemical Physics

ER -

Chen G, Zhang Y, Cheng H, Zhu Y , Li L, Lin H. Effects of two-dimension MXene Ti ₃ C ₂ on hydrogen storage performances of MgH ₂ -LiAlH ₄ composite Chemical Physics. 2019 Jun 1;522:178-187. doi: 10.1016/j.chemphys.2019.03.001

Effects of two-dimension MXene Ti ₃ C ₂ on hydrogen storage performances of MgH ₂ -LiAlH ₄ composite

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