Revisiting the Activity Gap of Iridium Electrocatalysts for Acidic Water Oxidation.
Type
ArticleKAUST Department
KAUST Catalysis Center and Division of Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.Chemical Science Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Date
2023-07-13Embargo End Date
2024-07-13Permanent link to this record
http://hdl.handle.net/10754/693014
Metadata
Show full item recordAbstract
Iridium electrocatalysts have been extensively studied for the acidic water oxidation reaction (2H2O → O2 + 4H+ + 4e–, also known as the oxygen evolution reaction, OER) in recent years. However, the activity of different iridium catalysts, such as amorphous, crystalline, and metallic ones, varies significantly, and there is no common explanation for the origin of this difference. Here four types of iridium catalysts were selected as models and characterized by various techniques. The redox behavior of iridium catalysts and oxidation of hydrogen peroxide (in the form of OOH–) were applied to in situ probe the adsorption energy of oxygen reaction intermediates (*OH, *O, and *OOH) on iridium catalysts under the OER conditions. Structure–activity analysis suggested that the more optimal and broader distribution of adsorption energies on metallic iridium (iridium black) and its good conductivity are the origin of its highest activity among the four different iridium catalysts.Citation
Gao, J., Tan, S. X., Liu, Y., Liu, B., & Huang, K.-W. (2023). Revisiting the Activity Gap of Iridium Electrocatalysts for Acidic Water Oxidation. The Journal of Physical Chemistry Letters, 6494–6505. https://doi.org/10.1021/acs.jpclett.3c01161Sponsors
This research is supported by the Agency for Science, Technology and Research (A*STAR) under its Career Development Fund (C210812029) and Central Research Fund (SC22/22-11571U). This research is also supported by the National Research Foundation, Singapore, and Public Utilities Board, Singapore’s National Water Agency under its Competitive Funding for Water Research (CWR-2101-0029).Publisher
American Chemical Society (ACS)PubMed ID
37439712Additional Links
https://pubs.acs.org/doi/10.1021/acs.jpclett.3c01161ae974a485f413a2113503eed53cd6c53
10.1021/acs.jpclett.3c01161
Scopus Count
Related articles
- Progress of Heterogeneous Iridium-Based Water Oxidation Catalysts.
- Authors: Gao J, Liu Y, Liu B, Huang KW
- Issue date: 2022 Nov 22
- Rational Design of an Iridium-Tungsten Composite with an Iridium-Rich Surface for Acidic Water Oxidation.
- Authors: Gao J, Huang X, Cai W, Wang Q, Jia C, Liu B
- Issue date: 2020 Jun 10
- Low-iridium electrocatalysts for acidic oxygen evolution.
- Authors: Fan M, Liang X, Chen H, Zou X
- Issue date: 2020 Nov 17
- Surface-Dependent Intermediate Adsorption Modulation on Iridium-Modified Black Phosphorus Electrocatalysts for Efficient pH-Universal Water Splitting.
- Authors: Mei J, He T, Bai J, Qi D, Du A, Liao T, Ayoko GA, Yamauchi Y, Sun L, Sun Z
- Issue date: 2021 Dec
- Progress of Nonprecious-Metal-Based Electrocatalysts for Oxygen Evolution in Acidic Media.
- Authors: Gao J, Tao H, Liu B
- Issue date: 2021 Aug