The borohydride oxidation reaction on La-Ni-based hydrogen-storage alloys
The borohydride oxidation reaction on La-Ni-based hydrogen-storage alloys
This work provides insights into the processes involved in the borohydride oxidation reaction (BOR) in alkaline media on metal hydride alloys formed by LaNi4.7Sn0.2Cu0.1 and LaNi4.78Al0.22 with and without deposited Pt, Pd, and Au. The results confirm the occurrence of hydrolysis of the borohydride ions when the materials are exposed to BH4- and a continuous hydriding of the alloys during BH4- oxidation measurements at low current densities. The activity for the direct BOR is low in both bare metal hydride alloys, but the rate of the BH4- hydrolysis and the hydrogen-storage capacity are higher, while the rate of H diffusion is slower for bare LaNi4.78Al0.22. The addition of Pt and Pd to both alloys results in an increase of the BH4- hydrolysis, but the H-2 formed is rapidly oxidized at the Pt-modified catalysts. In the case of Au modification, a small increase in the BH4- hydrolysis is observed as compared to the bare alloys. The presence of Au and Pd also leads to a reduction of the rates of alloy hydriding/de-hydriding.
2170-2176
Paschoalino, Waldemir J.
90f096a5-e5ca-4dcf-8b43-0f4f3d5930a5
Thompson, Stephen J.
46677911-01d9-478e-ad98-87ac37cd56a6
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Ticianelli, Edson A.
3be76da7-654c-4272-bff8-c7300cce9149
21 July 2014
Paschoalino, Waldemir J.
90f096a5-e5ca-4dcf-8b43-0f4f3d5930a5
Thompson, Stephen J.
46677911-01d9-478e-ad98-87ac37cd56a6
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Ticianelli, Edson A.
3be76da7-654c-4272-bff8-c7300cce9149
Paschoalino, Waldemir J., Thompson, Stephen J., Russell, Andrea E. and Ticianelli, Edson A.
(2014)
The borohydride oxidation reaction on La-Ni-based hydrogen-storage alloys.
[in special issue: Electrochemical Energy Conversion & Storage]
ChemPhysChem, 15 (10), .
(doi:10.1002/cphc.201400094).
(PMID:24700670)
Abstract
This work provides insights into the processes involved in the borohydride oxidation reaction (BOR) in alkaline media on metal hydride alloys formed by LaNi4.7Sn0.2Cu0.1 and LaNi4.78Al0.22 with and without deposited Pt, Pd, and Au. The results confirm the occurrence of hydrolysis of the borohydride ions when the materials are exposed to BH4- and a continuous hydriding of the alloys during BH4- oxidation measurements at low current densities. The activity for the direct BOR is low in both bare metal hydride alloys, but the rate of the BH4- hydrolysis and the hydrogen-storage capacity are higher, while the rate of H diffusion is slower for bare LaNi4.78Al0.22. The addition of Pt and Pd to both alloys results in an increase of the BH4- hydrolysis, but the H-2 formed is rapidly oxidized at the Pt-modified catalysts. In the case of Au modification, a small increase in the BH4- hydrolysis is observed as compared to the bare alloys. The presence of Au and Pd also leads to a reduction of the rates of alloy hydriding/de-hydriding.
Text
__filestore.soton.ac.uk_users_jks1m11_mydesktop_ChemPhysChem.pdf
- Accepted Manuscript
More information
e-pub ahead of print date: 2 April 2014
Published date: 21 July 2014
Organisations:
Electrochemistry
Identifiers
Local EPrints ID: 395994
URI: http://eprints.soton.ac.uk/id/eprint/395994
ISSN: 1439-4235
PURE UUID: b4807b8d-8454-4988-8436-41a24dc3db87
Catalogue record
Date deposited: 02 Jun 2016 08:42
Last modified: 15 Mar 2024 02:58
Export record
Altmetrics
Contributors
Author:
Waldemir J. Paschoalino
Author:
Stephen J. Thompson
Author:
Edson A. Ticianelli
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
