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Identification of the Active-Layer Structures for Acidic Oxygen Evolution from 9R-BaIrO3 Electrocatalyst with Enhanced Iridium Mass Activity
Abstract
Iridium-based perovskites show promising catalytic activity for oxygen evolution reaction (OER) in acid media, but the iridium mass activity remains low and the active-layer structures have not been identified. Here, we report highly active 1 nm IrO x particles anchored on 9R-BaIrO 3 (IrO x /9R-BaIrO 3 ) that are directly synthesized by solution calcination followed by strong acid treatment for the first time. The developed IrO x /9R-BaIrO 3 catalyst delivers a high iridium mass activity (168 A g Ir –1 ), about 16 times higher than that of the benchmark acidic OER electrocatalyst IrO 2 (10 A g Ir –1 ), and only requires a low overpotential of 230 mV to reach a catalytic current density of 10 mA cm –2 geo . Careful scanning transmission electron microscopy, synchrotron radiation-based X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy analyses reveal that, during the electrocatalytic process, the initial 1 nm IrO x nanoparticles/9R-BaIrO 3 evolve into amorphous Ir 4+ O x H y /IrO 6 octahedrons and then to amorphous Ir 5+ O x /IrO 6 octahedrons on the surface. Such high relative content of amorphous Ir 5+ O x species derived from trimers of face-sharing IrO 6 octahedrons in 9R-BaIrO3 and the enhanced metallic conductivity of the Ir 5+ O x /9R-BaIrO 3 catalyst are responsible for the excellent acidic OER activity. Our results provide new insights into the surface active-layer structure evolution in perovskite electrocatalysts and demonstrate new approaches for engineering highly active acidic OER nanocatalysts.
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Cites
Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction
McCrory, C. C. L., Jung, S., Peters, J. C., & Jaramillo, T. F. (2013) · Journal of the American Chemical Society · doi:10.1021/ja407115p · Cited by 7,026
Electrocatalysis for the oxygen evolution reaction: recent development and future perspectives
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A review on fundamentals for designing oxygen evolution electrocatalysts
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Homogeneously dispersed multimetal oxygen-evolving catalysts
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Cited by
Sun, H., Xu, X., Kim, H., Jung, W., Zhou, W., & Shao, Z. (2023) · ENERGY & ENVIRONMENTAL MATERIALS · doi:10.1002/eem2.12441 · Cited by 601
Shi, Z., Li, J., Wang, Y., Liu, S., Zhu, J., Yang, J., Wang, X., Ni, J., Jiang, Z., Zhang, L., et al. (2023) · Nature Communications · doi:10.1038/s41467-023-36380-9 · Cited by 477
Lattice‐Strain Engineering for Heterogenous Electrocatalytic Oxygen Evolution Reaction
Hou, Z., Cui, C., Li, Y., Gao, Y., Zhu, D., Gu, Y., Pan, G., Zhu, Y., & Zhang, T. (2023) · Advanced Materials · doi:10.1002/adma.202209876 · Cited by 365
Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers
Chen, Z., Guo, L., Pan, L., Yan, T., He, Z., Li, Y., Shi, C., Huang, Z., Zhang, X., & Zou, J. (2022) · Advanced Energy Materials · doi:10.1002/aenm.202103670 · Cited by 298
Electrocatalytic water splitting over perovskite oxide catalysts
Wang, Y., Wang, L., Zhang, K., Xu, J., Wu, Q., Xie, Z., An, W., Liang, X., & Zou, X. (2023) · Chinese Journal of Catalysis · doi:10.1016/s1872-2067(23)64452-3 · Cited by 77
Metadata
- Authors
- Li, N., Cai, L., Wang, C., Lin, Y., Huang, J., Sheng, H., Pan, H., Zhang, W., Ji, Q., Duan, H., Hu, W., Zhang, W., Hu, F., Tan, H., Sun, Z., Song, B., Jin, S., & Yan, W.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2021-10-25
- Volume
- 143
- Issue
- 43
- Pages
- 18001-18009
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W3208581358
- Cited by
- 173
- References
- 7
- FWCI
- 4.91
- Type
- journal article
- Language
- en
- Open access
- closed
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- Li, N., Cai, L., Wang, C., Lin, Y., Huang, J., Sheng, H., Pan, H., Zhang, W., Ji, Q., Duan, H., Hu, W., Zhang, W., Hu, F., Tan, H., Sun, Z., Song, B., Jin, S., & Yan, W. (2021). Identification of the Active-Layer Structures for Acidic Oxygen Evolution from 9R-BaIrO3 Electrocatalyst with Enhanced Iridium Mass Activity. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.1c04087
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