Issue 35, 2024

Location effects of vanadium in NiFe layered double hydroxides for oxygen evolution reaction

Abstract

NiFe layered double hydroxides (NiFe-LDHs) have been widely acknowledged as a promising anode electrocatalyst in alkaline oxygen evolution reactions (OERs), and vanadium has demonstrated its capability to improve their OER performance. Considering that V can exist as three vanadium-based species, i.e., doped VIII in LDH laminates, intercalated VO3 between LDH interlayers, and free VO3 as an additive in KOH electrolyte, we systematically studied and compared their effects in determining the OER performance of NiFe-LDHs. Electrochemical results reveal that all three conditions mentioned above individually can improve the OER performance of NiFe-LDHs. When two of these conditions are present at the same time, the combination of VO3 intercalated into LDHs as the catalyst and free VO3 as the additive in KOH electrolyte shows the best OER performance, even exceeding the performance exhibited by the combination of all three conditions. Ex situ Raman results indicate that VO3 intercalation triggers an active γ-phase formation of NiFe-LDHs; in situ Raman data further reveal that VO3 as an electrolyte additive stabilizes this active phase and slows down the dissolution of LDHs, as supported by inductively coupled plasma characterization.

Graphical abstract: Location effects of vanadium in NiFe layered double hydroxides for oxygen evolution reaction

Supplementary files

Article information

Article type
Paper
Submitted
17 ሜይ 2024
Accepted
09 ጁላይ 2024
First published
31 ጁላይ 2024

J. Mater. Chem. A, 2024,12, 23447-23453

Location effects of vanadium in NiFe layered double hydroxides for oxygen evolution reaction

M. Ma, Y. Zhang, X. Ding, J. Jing, L. Jin, W. Liu, D. Zhou and X. Sun, J. Mater. Chem. A, 2024, 12, 23447 DOI: 10.1039/D4TA03436H

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