Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis
Carbon-free use of hydrogen as a clean fuel and a viable energy storage medium has been impeded by the efficiency of water electrolysis, which in turn, is limited by the bottleneck anodic oxygen evolution reaction (OER). The discovery of potentially efficient catalysts for OER is a key factor to fac...
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sg-ntu-dr.10356-1542432022-02-25T08:20:16Z Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis Seow, Justin Zhu Yeow Nguyen, Tam Duy School of Mechanical and Aerospace Engineering Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU (ERI@N) Engineering::Materials Electrochemical Synthesis Bimetallic Nanocatalysts Carbon-free use of hydrogen as a clean fuel and a viable energy storage medium has been impeded by the efficiency of water electrolysis, which in turn, is limited by the bottleneck anodic oxygen evolution reaction (OER). The discovery of potentially efficient catalysts for OER is a key factor to facilitate the overall kinetics of water splitting, in which, noble metals such as Ru and Ir are still the conventional benchmarks. However, besides the high cost, such catalysts are also suffered from rapid performance degradation under OER conditions, particularly for Ru. In this work, Ru@IrOx core-shell nanoparticles (NPs) are successfully obtained through a wet chemical synthesis with the assistance of electro-oxidation. The NPs possess an ultra-small size of about 3.4 nm, achieving high specific OER activities of 51.99 μA/cm2oxide and 3.44 μA/cm2oxide as well as mass activities of 44.85 A/goxide and 3.03 A/goxide at overpotential of 250 mV (vs. RHE) in 0.1 M HClO4 and in 0.1 M KOH respectively. Furthermore, as-synthesized Ru@IrOx core-shell NPs are also proven to have excellent catalytic stability in both electrolytes, exhibiting great potential for application in both acidic and alkaline water electrolyzers. Ministry of Education (MOE) National Research Foundation (NRF) This work was supported by the Singapore Ministry of Education Tier 1 Grant (RG131/14) and Tier 2 Grant (MOE2015-T2-1-020) and the Singapore National Research Foundation under its Campus for Research Excellence And Technological Enterprise (CREATE) program. 2021-12-16T05:37:53Z 2021-12-16T05:37:53Z 2020 Journal Article Seow, J. Z. Y. & Nguyen, T. D. (2020). Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis. Electrochimica Acta, 341, 136058-. https://dx.doi.org/10.1016/j.electacta.2020.136058 0013-4686 https://hdl.handle.net/10356/154243 10.1016/j.electacta.2020.136058 2-s2.0-85081158093 341 136058 en RG131/14 MOE2015-T2-1-020 Electrochimica Acta © 2020 Elsevier Ltd. All rights reserved. |
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Engineering::Materials Electrochemical Synthesis Bimetallic Nanocatalysts Seow, Justin Zhu Yeow Nguyen, Tam Duy Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis |
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Carbon-free use of hydrogen as a clean fuel and a viable energy storage medium has been impeded by the efficiency of water electrolysis, which in turn, is limited by the bottleneck anodic oxygen evolution reaction (OER). The discovery of potentially efficient catalysts for OER is a key factor to facilitate the overall kinetics of water splitting, in which, noble metals such as Ru and Ir are still the conventional benchmarks. However, besides the high cost, such catalysts are also suffered from rapid performance degradation under OER conditions, particularly for Ru. In this work, Ru@IrOx core-shell nanoparticles (NPs) are successfully obtained through a wet chemical synthesis with the assistance of electro-oxidation. The NPs possess an ultra-small size of about 3.4 nm, achieving high specific OER activities of 51.99 μA/cm2oxide and 3.44 μA/cm2oxide as well as mass activities of 44.85 A/goxide and 3.03 A/goxide at overpotential of 250 mV (vs. RHE) in 0.1 M HClO4 and in 0.1 M KOH respectively. Furthermore, as-synthesized Ru@IrOx core-shell NPs are also proven to have excellent catalytic stability in both electrolytes, exhibiting great potential for application in both acidic and alkaline water electrolyzers. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Seow, Justin Zhu Yeow Nguyen, Tam Duy |
format |
Article |
author |
Seow, Justin Zhu Yeow Nguyen, Tam Duy |
author_sort |
Seow, Justin Zhu Yeow |
title |
Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis |
title_short |
Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis |
title_full |
Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis |
title_fullStr |
Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis |
title_full_unstemmed |
Electrochemically assisted synthesis of ultra-small Ru@IrOₓ core-shell nanoparticles for water splitting electro-catalysis |
title_sort |
electrochemically assisted synthesis of ultra-small ru@iroₓ core-shell nanoparticles for water splitting electro-catalysis |
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2021 |
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https://hdl.handle.net/10356/154243 |
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1725985674359734272 |