Related Experiment Video
Updated: Mar 27, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
Promoting Oxide Pathway Mechanism on Low-Ruthenium-Content Oxides for Enhanced Oxygen Evolution in Proton Exchange
Shaozhen Liu1, Shiyu Wang1, Shuxia Liu1
1State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, China.
None:
RuO2 emerges as a promising alternative to IrO2 for acidic oxygen evolution reaction (OER) due to its relatively low cost. But its practical application remains hindered by stability issues originating from the oxidation of lattice oxygen. Here, we report a low Ru-content solid solution oxide (Ru0.32Ta0.66Mn0.02O2) for efficient acidic OER. The Ru0.32Ta0.66Mn0.02O2 catalyst possesses a low overpotential of 175 mV@10 mA cm-2 in 0.5 M H2SO4 and achieves current densities of 0.5/1 A cm-2 at cell voltages of 1.539/1.660 V in a proton exchange membrane water electrolyzer with stable response for over 1000 h@0.5 A cm-2. X-ray absorption spectroscopy (XAS) reveals that Ta and Mn effectively modulates the distance between the active sites, thereby promoting the direct O─O coupling. Moreover, Mn increases the surface coverage of *OH, facilitating the oxide pathway mechanism (OPM) for OER. In situ infrared spectroscopy and 18O-labeled mass spectrometry confirm the formation of *O─O* intermediate on Ru0.32Ta0.66Mn0.02O2 via OPM. Density functional theory calculation demonstrates that TaO2 matrix weakens the d-p orbital hybridization and attenuate the Ru─O covalency, thereby inhibiting the oxidation of lattice oxygen. In addition, the doped Mn reduces the OER free energy barrier by triggering the OPM, breaking the linear scaling relationship of OER.
More Related Videos
Related Concept Videos
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Oxygenic Photosynthesis
Heterogeneous Catalysis
Oxidative Cleavage of Alkenes: Ozonolysis
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Oxidation of Phenols to Quinones
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
Electron Transport Chains
The ETC is comprised of...

