Facet-Dependent Lattice Oxygen Activation on Oxygen-Defective Co3O4 for Electrocatalytic Oxygen Evolution Reaction
Source abstract
Abstract
Introducing oxygen vacancies into Co-based oxides with different surface structures can significantly affect their coordination environments and electronic structures, possibly contributing to the variation of the electrocatalytic oxygen evolution reaction (OER) activity. Herein, the oxygen vacancies were introduced into Co 3 O 4 cubes and truncated octahedrons to uncover the effects of facets (001) and (111) on the intrinsic OER activity of oxygen-defective Co 3 O 4 . The (001)-faceted Co 3 O 4 cubes with oxygen vacancies exhibited a lower onset overpotential of 298 mV than that of multifaceted truncated octahedrons (335 mV) because of the sufficient lattice oxygen participation in the OER process. Theoretical calculations revealed that oxygen vacancy on (001) surfaces can upshift the O 2p band center and trigger the lattice oxygen oxidation mechanism while oxygen vacancy on (111) surfaces matched well with the absorbate evolution mechanism. This work offers a new insight for designing OER electrocatalysts by selectively introducing oxygen defects on well-defined crystal facets.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Catalytic Processes in Materials Science · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, P. R. China
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
Key Lab of Efficient Conversion and Solid-State Storage of Hydrogen&Electricity, Anhui Province, Anhui University of Technology, Maanshan 243002, P. R. China
Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
Funding
Agency for Science, Technology and Research · Scientific Research Foundation of Education Department of Anhui Province of China · National Research Foundation Singapore · National Natural Science Foundation of China · Natural Science Foundation of Anhui Province · Anhui Provincial Key Research and Development Plan
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