Jump to main content
Jump to site search


Optimized Co2+(Td)–O–Fe3+(Oh) electronic states in a spinel electrocatalyst for highly efficient oxygen evolution reaction performance

Author affiliations

Abstract

Electronic configuration is crucial for enhancing the catalytic activities of spinels for the oxygen evolution reaction (OER). However, controlling the electronic spin state of materials is still a challenge. In this work, we synthesized Fe-doped meso-Co3O4 via a nanocasting method. The merit of our method lies in high spin state Fe3+ (t2g3eg2) being controllably introduced into an octahedral site to regulate the valence states and configure the eg electron of Co3+. The introduced Fe3+ prefers to occupy octahedral sites due to its lower formation energy. Then, Fe3+ doping enlarges the Co3+–O distance and decreases the lattice symmetry, leading to the splitting of the d-orbital in Co3+. Our density functional theory (DFT) calculations reveal that spin state optimized Co3+(Oh) acts preferentially as an active site. Furthermore, CoFe-7.5 (Co2.775Fe0.225O4), with its maximum Fe3+(Oh) content, exhibits the best OER activity. Our work indicates that the introduction of Fe3+ enables an improvement in the electrocatalytic performance of Co3O4 by regulating the spin state of Co3+.

Graphical abstract: Optimized Co2+(Td)–O–Fe3+(Oh) electronic states in a spinel electrocatalyst for highly efficient oxygen evolution reaction performance

Back to tab navigation

Supplementary files

Publication details

The article was received on 12 Jul 2019, accepted on 24 Sep 2019 and first published on 25 Sep 2019


Article type: Research Article
DOI: 10.1039/C9QI00852G
Inorg. Chem. Front., 2019, Advance Article

  •   Request permissions

    Optimized Co2+(Td)–O–Fe3+(Oh) electronic states in a spinel electrocatalyst for highly efficient oxygen evolution reaction performance

    X. Gao, J. Liu, Y. Sun, X. Wang, Z. Geng, F. Shi, X. Wang, W. Zhang, S. Feng, Y. Wang and K. Huang, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QI00852G

Search articles by author

Spotlight

Advertisements