Boosting the OER activity of amorphous IrOx in acidic medium by tuning its electron structure using lanthanum salt nanosheets
- Authors
- Wang, Xuefeng; Jang, Haeseong; Li, Zijian; Li, Haisen; Li, Guangkai; Kim, Min Gyu; Ji, Xuqiang; Qin, Qing; Liu, Xien
- Issue Date
- Jan-2023
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NEW JOURNAL OF CHEMISTRY, v.47, no.5, pp 2619 - 2625
- Pages
- 7
- Journal Title
- NEW JOURNAL OF CHEMISTRY
- Volume
- 47
- Number
- 5
- Start Page
- 2619
- End Page
- 2625
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69339
- DOI
- 10.1039/d2nj05464g
- ISSN
- 1144-0546
1369-9261
- Abstract
- 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-IrOx and lanthanum salt (LaCO3OH) was constructed to further improve its OER activity by tuning the electronic structure of a-IrOx, because a-IrOx 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 IrOx/LaCO3OH, verified by X-ray absorption near edge structure spectroscopy, tunes the electronic structure of a-IrOx and thus obviously enhances its activity for the OER in acid media, compared with commercially available IrO2 as well as most of the reported Ir-based OER electrocatalysts. The overpotential of IrOx/LaCO3OH 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.
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