Ru@RuO2 Core‐Shell Nanorods: A Highly Active and Stable Bifunctional Catalyst for Oxygen Evolution and Hydrogen Evolution Reactions

Ru@RuO2 Core‐Shell Nanorods: A Highly Active and Stable Bifunctional Catalyst for Oxygen Evolution and Hydrogen Evolution Reactions

Ru@RuO2 core‐shell nanorods were successfully synthesized by heat‐treating Ru nanorods with air oxidation through an accurate control of the temperature and time. The structure, composition, dimension, and adsorption property of the core‐shell nanorods were well characterized with XRD and TEM. The c...

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Bibliographic Details
Published in:Energy & environmental materials (Hoboken, N.J.) N.J.), 2019-09, Vol.2 (3), p.201-208
Main Authors: Jiang, Rongzhong, Tran, Dat T., Li, Jiangtian, Chu, Deryn
Format: Article
Language:eng
Subjects:
Air temperature
bifunctional catalyst
Catalysts
Catalytic activity
core–shell
Current density
Electrodes
Evolution
Hydrogen evolution
hydrogen evolution reaction
Nanorods
Oxidation
Oxygen
oxygen evolution reaction
Oxygen evolution reactions
Rotating disks
Ru@RuO2
Ruthenium
Ruthenium oxide
Stability analysis
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Summary:Ru@RuO2 core‐shell nanorods were successfully synthesized by heat‐treating Ru nanorods with air oxidation through an accurate control of the temperature and time. The structure, composition, dimension, and adsorption property of the core‐shell nanorods were well characterized with XRD and TEM. The catalytic activity and stability were electrochemically evaluated with a rotating disk electrode, a rotating ring‐disk electrode, and chronopotentiometric methods. The Ru@RuO2 nanorods reveal excellent bifunctional catalytic activity and robust stability for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The overpotentials for OER and HER are 320 mV and 137 mV at the current density of 10 mA cm−2, respectively. The catalytic activity of Ru@RuO2 nanorods for OER is 6.5 times higher than that of the state‐of‐the‐art catalyst IrO2 according to the catalytic current density measured at 1.60 V (versus RHE). The catalytic activity of Ru@RuO2 nanorods for HER is comparable to 40% Pt/C by comparing the catalytic current densities at −0.2 V. The Ru@RuO2 nanorods reveal excellent bifunctional catalytic activity and robust stability for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) due to its unique nano structures.
ISSN:2575-0356
2575-0356