High entropy stabilizing lattice oxygen participation of Ru- based oxides in acidic water oxidation

The development of high-performance oxygen evolution reaction (OER) electrocatalysts for water splitting, particularly in acidic media, remains a difficult challenge. In this work, a Ru-based high entropy oxide (HEO) catalyst, RuNiMoCrFeO x nanoparticles (∼6 nm), loaded onto carbon nanotubes (CNTs)...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-10, Vol.1 (4), p.2126-21265
Main Authors: Yu, Yaodong, Li, Hongdong, Liu, Jiao, Xu, Wenxia, Zhang, Dan, Xiong, Juan, Li, Bin, Omelchuk, A. O, Lai, Jianping, Wang, Lei
Format: Article
Language:English
Subjects:
Acidic oxides
Acidic water
Carbon nanotubes
Catalysts
Electrocatalysts
Electron paramagnetic resonance
Electron spin
Electron spin resonance
Electrons
Entropy
Nanoparticles
Nanotechnology
Nanotubes
Oxidation
Oxygen
Oxygen evolution reactions
Ruthenium
Spin resonance
Sulfuric acid
Water splitting
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Summary:The development of high-performance oxygen evolution reaction (OER) electrocatalysts for water splitting, particularly in acidic media, remains a difficult challenge. In this work, a Ru-based high entropy oxide (HEO) catalyst, RuNiMoCrFeO x nanoparticles (∼6 nm), loaded onto carbon nanotubes (CNTs) was synthesized by a solvent-free microwave method. By optimising its composition, we find that the RuNiMoCrFeO x /CNT catalyst shows high performance in 0.5 M H 2 SO 4 , with the overpotential of the HEO being only 219 mV (better than the 280 mV of commercial RuO 2 ) at 10 mA cm −2 and the Tafel slope reaching 47 mV dec −1 . It is worth noting that this high entropy oxide (HEO) can operate at a high current density of 100 mA cm −2 for up to 100 hours. The isotopic gas detection and electron spin resonance (ESR) experiments show that the OER tends to proceed through the LOM, and the high conformational entropy stabilizes the involvement of lattice oxygen in acidic solutions. A novel Ru-based high entropy oxide electrocatalyst RuNiMoCrFeO x /CNT was successfully synthesized, where the OER tends to proceed through the LOM on the high entropy surface, high entropy stabilizes the lattice oxygen to participate in the reaction.
ISSN:2050-7488
2050-7496
DOI:10.1039/d2ta06128g