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Rational Design of Rhodium–Iridium Alloy Nanoparticles as Highly Active Catalysts for Acidic Oxygen Evolution
Open accessAbstract
The oxygen evolution reaction (OER) is pivotal for renewable energy conversion and storage devices, such as water electrolyzers and rechargeable metal–air batteries. However, the rational design of electrocatalysts with suitably high efficiencies and stabilities in strongly acidic electrolytes remains a significant challenge. Here, we show the demonstration of sub-10 nm, composition-tunable Rh–Ir alloy nanoparticles (NPs) prepared using a scalable microwave-assisted method as superior acidic OER catalysts. The OER activities showed a volcano-shaped dependence on Ir composition, with Ir-rich NPs (Ir ≥ 51%) achieving better OER performance than pure Ir NPs, as reflected by lower overpotentials and higher mass activities. Most significantly, Rh 22 Ir 78 NPs achieved a maximum mass activity of 1.17 A mg –1 Ir at a 300 mV overpotential in 0.5 M H 2 SO 4, which corresponds to a 3-fold enhancement relative to pure Ir NPs, making it one of the most active reported OER catalysts under acidic conditions. Density functional theory calculations reveal that owing to the synergy of ensemble and electronic effects by alloying a small amount of Rh with Ir, the binding energy difference of the O and OOH intermediates is reduced, leading to faster kinetics and enhanced OER activity. Furthermore, Rh–Ir alloy NPs demonstrated excellent durability in strongly acidic electrolyte. This work not only provides fundamental understandings relating to composition–electrochemical performance relationships but also represents the rational design of highly efficient OER electrocatalysts for applications in acidic media.
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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
Recent Progress in Electrocatalysts for Acidic Water Oxidation
Lei, Z., Wang, T., Zhao, B., Cai, W., Liu, Y., Jiao, S., Li, Q., Cao, R., & Liu, M. (2020) · Advanced Energy Materials · doi:10.1002/aenm.202000478 · Cited by 336
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
Metadata
- Authors
- Guo, H., Fang, Z., Li, H., Fernandez, D., Henkelman, G., Humphrey, S. M., & Yu, G.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-10-31
- Volume
- 13
- Issue
- 11
- Pages
- 13225-13234
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2982403606
- Cited by
- 233
- References
- 9
- FWCI
- 4.33
- Type
- journal article
- Language
- en
- Open access
- green
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- Guo, H., Fang, Z., Li, H., Fernandez, D., Henkelman, G., Humphrey, S. M., & Yu, G. (2019). Rational Design of Rhodium–Iridium Alloy Nanoparticles as Highly Active Catalysts for Acidic Oxygen Evolution. ACS Nano. https://doi.org/10.1021/acsnano.9b06244
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