Ferromagnetic Surface Segregation via Stress-Concentration Coupling Boosts the Oxygen Evolution Reaction in RuO2
Source abstract
Abstract
RuO 2, the benchmark catalyst for the oxygen evolution reaction (OER), has traditionally been considered Pauli paramagnetic; however, recent findings have demonstrated its antiferromagnetic (AFM) properties, hinting at the opportunity to enhance RuO 2 ’s OER performance by manipulating its magnetic traits. In this study, we successfully induced weak ferromagnetism in commercial RuO 2, transitioning it from an AFM state using an electrochemical sodiation method. This process resulted in high activity, achieving an overpotential of 145 mV to reach 10 mA cm –2 and extending the service hours by more than 13 times compared to pristine RuO 2 in 0.5 M H 2 SO 4 . A combination of experimental and theoretical analyses indicated that the sodiation triggers significant surface compressive stress, leading to lattice distortion and disruption of the pristine structural symmetry of RuO 2 . Consequently, orbital degeneration ensues, prompting individual spin-up d electrons to jump to the high-spin state. This mechanism drives the conversion from AFM to weak FM behavior for RuO 2, ultimately yielding exceptional catalytic activity and stability.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Electronic and Structural Properties of Oxides · Catalytic Processes in Materials Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering
Harbin Institute of Technology
School of Science
Spallation Neutron Source Science Center
Institute of High Energy Physics
Chinese Academy of Sciences
Department of Materials Science and Engineering
Shenzhen MSU-BIT University
Guangzhou Municipal Key Laboratory of Materials Informatics
The Hong Kong University of Science and Technology (Guangzhou)
Materials Characterization and Preparation Facility
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics
Songshan Lake Materials Laboratory
Materials Genome Institute
Shanghai University
Funding
Shenzhen Municipal Fundamental Research Program · Basic and Applied Basic Research Foundation of Guangdong Province · National Natural Science Foundation of China · Shenzhen Science and Technology Innovation Program · Guangzhou-HKUST(GZ) Joint Funding Program
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