The role of niobium oxide as a surface catalyst for hydrogen absorption

A. Borgschulte; J. H. Rector; B. Dam; R. Griessen; A. Züttel

doi:10.1016/j.jcat.2005.08.018

The role of niobium oxide as a surface catalyst for hydrogen absorption

A. Borgschulte^*, J. H. Rector, B. Dam, R. Griessen, A. Züttel

^*Corresponding author for this work

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

35 Citations (Scopus)

Abstract

The catalytic activity of niobium oxide for hydrogen absorption is determined using an optical indicator technique to measure hydrogen sorption kinetics. The catalytic activity of NbO_x is studied as a function of the oxygen concentration determined from electron spectroscopy. STM measurements display a clustered NbO_x surface, disproving a diffusion-controlled kinetics. The catalytic effect results from dissociation of hydrogen by niobium oxide. The measured activation energy depends strongly on the oxygen concentration and reaches a minimum of 0.6 eV at the highest oxygen content (x=2.5, i.e., Nb₂O₅). Pure Nb does not display a catalytic effect. Oxide surfaces with a high concentration of artificial oxygen vacancies are less catalytically active.

Original language	English
Pages (from-to)	353-358
Number of pages	6
Journal	Journal of Catalysis
Volume	235
Issue number	2
DOIs	https://doi.org/10.1016/j.jcat.2005.08.018
Publication status	Published - 25 Oct 2005

Bibliographical note

Funding Information:
This work is financially supported by the Stichting voor Fundamenteel Onderzoek der Materie (FOM) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) through the ACTS program.

Keywords

Catalysis
Hydrogen absorption
Hydrogenography
Niobium oxide
Surface structure

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10.1016/j.jcat.2005.08.018

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title = "The role of niobium oxide as a surface catalyst for hydrogen absorption",

abstract = "The catalytic activity of niobium oxide for hydrogen absorption is determined using an optical indicator technique to measure hydrogen sorption kinetics. The catalytic activity of NbOx is studied as a function of the oxygen concentration determined from electron spectroscopy. STM measurements display a clustered NbOx surface, disproving a diffusion-controlled kinetics. The catalytic effect results from dissociation of hydrogen by niobium oxide. The measured activation energy depends strongly on the oxygen concentration and reaches a minimum of 0.6 eV at the highest oxygen content (x=2.5, i.e., Nb2O5). Pure Nb does not display a catalytic effect. Oxide surfaces with a high concentration of artificial oxygen vacancies are less catalytically active.",

keywords = "Catalysis, Hydrogen absorption, Hydrogenography, Niobium oxide, Surface structure",

author = "A. Borgschulte and Rector, {J. H.} and B. Dam and R. Griessen and A. Z{\"u}ttel",

note = "Funding Information: This work is financially supported by the Stichting voor Fundamenteel Onderzoek der Materie (FOM) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) through the ACTS program.",

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T1 - The role of niobium oxide as a surface catalyst for hydrogen absorption

AU - Borgschulte, A.

AU - Rector, J. H.

AU - Dam, B.

AU - Griessen, R.

AU - Züttel, A.

N1 - Funding Information: This work is financially supported by the Stichting voor Fundamenteel Onderzoek der Materie (FOM) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) through the ACTS program.

PY - 2005/10/25

Y1 - 2005/10/25

N2 - The catalytic activity of niobium oxide for hydrogen absorption is determined using an optical indicator technique to measure hydrogen sorption kinetics. The catalytic activity of NbOx is studied as a function of the oxygen concentration determined from electron spectroscopy. STM measurements display a clustered NbOx surface, disproving a diffusion-controlled kinetics. The catalytic effect results from dissociation of hydrogen by niobium oxide. The measured activation energy depends strongly on the oxygen concentration and reaches a minimum of 0.6 eV at the highest oxygen content (x=2.5, i.e., Nb2O5). Pure Nb does not display a catalytic effect. Oxide surfaces with a high concentration of artificial oxygen vacancies are less catalytically active.

AB - The catalytic activity of niobium oxide for hydrogen absorption is determined using an optical indicator technique to measure hydrogen sorption kinetics. The catalytic activity of NbOx is studied as a function of the oxygen concentration determined from electron spectroscopy. STM measurements display a clustered NbOx surface, disproving a diffusion-controlled kinetics. The catalytic effect results from dissociation of hydrogen by niobium oxide. The measured activation energy depends strongly on the oxygen concentration and reaches a minimum of 0.6 eV at the highest oxygen content (x=2.5, i.e., Nb2O5). Pure Nb does not display a catalytic effect. Oxide surfaces with a high concentration of artificial oxygen vacancies are less catalytically active.

KW - Catalysis

KW - Hydrogen absorption

KW - Hydrogenography

KW - Niobium oxide

KW - Surface structure

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DO - 10.1016/j.jcat.2005.08.018

M3 - Article

AN - SCOPUS:26444609168

SN - 0021-9517

VL - 235

SP - 353

EP - 358

JO - Journal of Catalysis

JF - Journal of Catalysis

IS - 2

ER -

The role of niobium oxide as a surface catalyst for hydrogen absorption

Abstract

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Keywords

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