Rational Design of Rhodium–Iridium Alloy Nanoparticles as Highly Active Catalysts for Acidic Oxygen Evolution
Abstract
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, Rh22Ir78 NPs achieved a maximum mass activity of 1.17 A mg–1Ir at a 300 mV overpotential in 0.5 M H2SO4, 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.more »
- Publication Date:
- Research Org.:
- Univ. of Texas, Austin, TX (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1774914
- Grant/Contract Number:
- SC0019019
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Nano
- Additional Journal Information:
- Journal Volume: 13; Journal Issue: 11; Journal ID: ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; rhodium−iridium alloy; oxygen evolution reaction; acidic electrolyte; microwave synthesis; ensemble effect; radiology; alloys; precursors; catalysts; transition metals
Citation Formats
Guo, Hongyu, Fang, Zhiwei, Li, Hao, Fernandez, Desiree, Henkelman, Graeme, Humphrey, Simon M., and Yu, Guihua. Rational Design of Rhodium–Iridium Alloy Nanoparticles as Highly Active Catalysts for Acidic Oxygen Evolution. United States: N. p., 2019.
Web. doi:10.1021/acsnano.9b06244.
Guo, Hongyu, Fang, Zhiwei, Li, Hao, Fernandez, Desiree, Henkelman, Graeme, Humphrey, Simon M., & Yu, Guihua. Rational Design of Rhodium–Iridium Alloy Nanoparticles as Highly Active Catalysts for Acidic Oxygen Evolution. United States. https://doi.org/10.1021/acsnano.9b06244
Guo, Hongyu, Fang, Zhiwei, Li, Hao, Fernandez, Desiree, Henkelman, Graeme, Humphrey, Simon M., and Yu, Guihua. Thu .
"Rational Design of Rhodium–Iridium Alloy Nanoparticles as Highly Active Catalysts for Acidic Oxygen Evolution". United States. https://doi.org/10.1021/acsnano.9b06244. https://www.osti.gov/servlets/purl/1774914.
@article{osti_1774914,
title = {Rational Design of Rhodium–Iridium Alloy Nanoparticles as Highly Active Catalysts for Acidic Oxygen Evolution},
author = {Guo, Hongyu and Fang, Zhiwei and Li, Hao and Fernandez, Desiree and Henkelman, Graeme and Humphrey, Simon M. and Yu, Guihua},
abstractNote = {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, Rh22Ir78 NPs achieved a maximum mass activity of 1.17 A mg–1Ir at a 300 mV overpotential in 0.5 M H2SO4, 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. Furthermore, 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.},
doi = {10.1021/acsnano.9b06244},
journal = {ACS Nano},
number = 11,
volume = 13,
place = {United States},
year = {Thu Oct 31 00:00:00 EDT 2019},
month = {Thu Oct 31 00:00:00 EDT 2019}
}
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