Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5

Nobuko Hanada; Takayuki Ichikawa; Satoshi Hino; Hironobu Fujii

doi:10.1016/j.jallcom.2005.08.084

Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb₂O₅

Nobuko Hanada, Takayuki Ichikawa^*, Satoshi Hino, Hironobu Fujii

^*Corresponding author for this work

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

227 Citations (Scopus)

Abstract

Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH₂ composite doped with 1 mol% Nb₂O₅ as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ∼4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 s and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH₂ after rehydrogenation desorbed ∼6 mass% hydrogen at 160 °C under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ∼71 kJ/mol H₂, indicating the product was significantly activated due to the catalytic effect of Nb₂O₅.

Original language	English
Pages (from-to)	46-49
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	420
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2005.08.084
Publication status	Published - 2006 Aug 31
Externally published	Yes

Keywords

High energy ballmilling
Hydrogen storage materials
Thermal analysis

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2005.08.084

Cite this

@article{e02e1c7f805b4fe8a445c411bb08daf3,

title = "Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5",

abstract = "Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH2 composite doped with 1 mol% Nb2O5 as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ∼4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 s and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH2 after rehydrogenation desorbed ∼6 mass% hydrogen at 160 °C under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ∼71 kJ/mol H2, indicating the product was significantly activated due to the catalytic effect of Nb2O5.",

keywords = "High energy ballmilling, Hydrogen storage materials, Thermal analysis",

author = "Nobuko Hanada and Takayuki Ichikawa and Satoshi Hino and Hironobu Fujii",

note = "Funding Information: This work was carried out by the Grant-in-Aid for COE Research (No. 13CE2002) of the Ministry of Education, Science and Culture of Japan. The authors gratefully acknowledge Dr. H.Y. Leng and Mr. Isobe for useful discussions.",

year = "2006",

month = aug,

day = "31",

doi = "10.1016/j.jallcom.2005.08.084",

language = "English",

volume = "420",

pages = "46--49",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

number = "1-2",

}

TY - JOUR

T1 - Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5

AU - Hanada, Nobuko

AU - Ichikawa, Takayuki

AU - Hino, Satoshi

AU - Fujii, Hironobu

N1 - Funding Information: This work was carried out by the Grant-in-Aid for COE Research (No. 13CE2002) of the Ministry of Education, Science and Culture of Japan. The authors gratefully acknowledge Dr. H.Y. Leng and Mr. Isobe for useful discussions.

PY - 2006/8/31

Y1 - 2006/8/31

N2 - Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH2 composite doped with 1 mol% Nb2O5 as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ∼4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 s and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH2 after rehydrogenation desorbed ∼6 mass% hydrogen at 160 °C under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ∼71 kJ/mol H2, indicating the product was significantly activated due to the catalytic effect of Nb2O5.

AB - Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH2 composite doped with 1 mol% Nb2O5 as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ∼4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 s and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH2 after rehydrogenation desorbed ∼6 mass% hydrogen at 160 °C under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ∼71 kJ/mol H2, indicating the product was significantly activated due to the catalytic effect of Nb2O5.

KW - High energy ballmilling

KW - Hydrogen storage materials

KW - Thermal analysis

UR - http://www.scopus.com/inward/record.url?scp=33745593060&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745593060&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2005.08.084

DO - 10.1016/j.jallcom.2005.08.084

M3 - Article

AN - SCOPUS:33745593060

SN - 0925-8388

VL - 420

SP - 46

EP - 49

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -