AI Article Synopsis
- RuO is an effective electrocatalyst for the oxygen evolution reaction (OER) but suffers from stability issues due to oxidation leading to its dissolution.
- A new bicomponent electrocatalyst combining NiO and RuO on carbon nanotubes (RuO/NiO/CNT) is introduced, which enhances RuO's stability during OER while maintaining its high performance.
- Density functional theory (DFT) analysis reveals that NiO helps reduce the oxidation state of RuO by transferring electrons, ultimately improving the longevity of the catalyst during prolonged OER operation.
Article Abstract
RuO is an efficient electrocatalyst for the oxygen evolution reaction (OER). However, during the OER process, RuO is prone to oxidation into Ru (x > 4), leading to its dissolution in the electrolyte and resulting in poor stability of RuO. Here, we report a bicomponent electrocatalyst, NiO and RuO co-loaded on carbon nanotubes (RuO/NiO/CNT). The results demonstrate that the introduction of NiO suppresses the over-oxidation of RuO during the OER process, not only inheriting the excellent catalytic performance of RuO, but also significantly enhancing the stability of the catalyst for OER at high current densities. In contrast to RuO/CNT, RuO/NiO/CNT shows no significant change in activity after 150 h of OER at a current density of 100 mA cm. Density functional theory (DFT) calculations indicate that NiO transfers a large number of electrons to RuO, thereby reducing the oxidation state of Ru. In conclusion, this study provides a detailed analysis of the phenomenon where low-valent metal oxides have the ability to enhance the stability of RuO catalysts.
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| http://dx.doi.org/10.1016/j.jcis.2024.08.047 | DOI Listing |
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