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Boosting the OER activity of amorphous IrO in acidic medium by tuning its electron structure using lanthanum salt nanosheets
Promoting the activity of Ir-based nanomaterials for oxygen evolution reaction (OER) in acid media without losing their durability is crucial for reducing overpotentials in energy conversion, such as electrochemical water splitting. Here, a nanocomposite composed of a-IrO x and lanthanum salt (LaCO...
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Published in: | New journal of chemistry 2023-01, Vol.47 (5), p.2619-2625 |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | |
Online Access: | Get full text |
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Summary: | Promoting the activity of Ir-based nanomaterials for oxygen evolution reaction (OER) in acid media without losing their durability is crucial for reducing overpotentials in energy conversion, such as electrochemical water splitting. Here, a nanocomposite composed of a-IrO
x
and lanthanum salt (LaCO
3
OH) was constructed to further improve its OER activity by tuning the electronic structure of a-IrO
x
, because a-IrO
x
is a well-known critical material as the active layer of Ir-based anodic catalysts. The interaction between Ir and La
via
O atoms as a bridge in the catalyst IrO
x
/LaCO
3
OH, verified by X-ray absorption near edge structure spectroscopy, tunes the electronic structure of a-IrO
x
and thus obviously enhances its activity for the OER in acid media, compared with commercially available IrO
2
as well as most of the reported Ir-based OER electrocatalysts. The overpotential of IrO
x
/LaCO
3
OH at a current density of 10 mA cm
−2
is 255 mV with a Tafel slope of 55 mV dec
−1
. This work reveals that the strong electronic interaction between Ir- and La-based materials can efficiently improve activity and reduce energy consumption, as well as enlarging the family of acidic OER electrocatalysts.
The interaction between Ir and La
via
O atoms as a bridge in a-IrO
x
/LaCO
3
OH boosts the acidic OER activity of a-IrO
x
. |
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ISSN: | 1144-0546 1369-9261 |
DOI: | 10.1039/d2nj05464g |