Issue 24, 2023

Reversing Mg suppression effect on Co-site water oxidation of MgCo2O4 based on vanadium-atom electronic affinity synergy with Mg sites toward electronic redistribution

Abstract

Active-site regeneration from d-band-center control engineering and electronic redistribution based on target-atom implantation is of enormous importance for efficient water oxidation. Here, low-activity Co catalytic sites of MgCo2O4 are reactivated for large-current (500 mA cm−2) and high-efficiency water oxidation through vanadium-atom electronic affinity synergy with Mg sites toward charge rearrangement around Co sites. Interestingly, very little vanadium (1.3 wt%) was implanted into MgCo2O4 to achieve atom-scale structure tailoring and electronic redistribution, reversing the Mg suppression effect on Co-site water oxidation of MgCo2O4. Vanadium-implantation-tailored MgCo2O4 coupled with MgO (V–MgCo2O4@MgO) exhibits significantly enhanced oxygen evolution reaction performance, with low overpotentials of 240 and 290 mV for 100 and 500 mA cm−2, respectively, in 1 M KOH. Operating at 500 mA cm−2, V–MgCo2O4@MgO has good catalytic stability for at least 20 hours. This work constructs excellent catalysts through atomic-level structural regulation and provides a new perspective for the principle of electronic-affinity synergy between V and Mg species toward Co–O bond optimization.

Graphical abstract: Reversing Mg suppression effect on Co-site water oxidation of MgCo2O4 based on vanadium-atom electronic affinity synergy with Mg sites toward electronic redistribution

Supplementary files

Article information

Article type
Paper
Submitted
05 Aug. 2023
Accepted
30 Okt. 2023
First published
31 Okt. 2023

Catal. Sci. Technol., 2023,13, 6951-6958

Reversing Mg suppression effect on Co-site water oxidation of MgCo2O4 based on vanadium-atom electronic affinity synergy with Mg sites toward electronic redistribution

H. Zhang, H. Han, X. Yang, H. Ma, Z. Song and X. Ji, Catal. Sci. Technol., 2023, 13, 6951 DOI: 10.1039/D3CY01085F

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