Chinese Journal of Catalysis ›› 2025, Vol. 72: 164-175.DOI: 10.1016/S1872-2067(24)60276-7
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Jiangyu Tanga, Xiao Wangb, Yunfa Wanga, Min Shia, Peng Huoa, Jianxiang Wua, Qiaoxia Lia,*(), Qunjie Xua,c,*(
)
Received:
2024-12-06
Accepted:
2025-02-03
Online:
2025-05-18
Published:
2025-05-20
Contact:
*E-mail: liqiaoxia@shiep.edu.cn (Q. Li), xuqunjie@shiep.edu.cn (Q. Xu).
Supported by:
Jiangyu Tang, Xiao Wang, Yunfa Wang, Min Shi, Peng Huo, Jianxiang Wu, Qiaoxia Li, Qunjie Xu. Active non-bonding oxygen mediate lattice oxygen oxidation on NiFe2O4 achieving efficient and stable water oxidation[J]. Chinese Journal of Catalysis, 2025, 72: 164-175.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60276-7
Fig. 1. (a) SEM image of the Ar-NFO-S. (b-d) TEM image of Ar-NFO-S in different TEM mode. (e) HRTEM image of Ar-NFO-S. (f) Elemental mapping of Ni, Fe, O, S, and C in Ar-NFO-S. (g) XRD patterns of all catalysts. (h) Metal weight ratios of Air-NFO, Ar-NFO, and Ar-NFO-S.
Fig. 2. (a) Raman spectra of all samples. Ni 2p (b), Fe 2p (c), O 1s (d) XPS spectra of Ar-NFO-S, Ar-NFO, and Air-NFO. (e) EPR spectra of Ar-NFO-S, Ar-NFO, and Air-NFO. (f) Projected DOS of Ni (3d), Fe (3d), and O (2p). (g) Schematic energy bands of Air-NFO, Ar-NFO, and Ar-NFO-S in consideration of Mott-Hubbard splitting.
Fig. 3. (a) LSV curves (90% IR compensation) at a scan rate of 5 mV/s in O2 saturated 1 mol/L KOH electrolyte. Tafel plots (b) and Nyquist plots (c) of Ar-NFO-S, Ar-NFO, Air-NFO-S and Air-NFO. (d) TOF-j column chart of Ar-NFO-S, Ar-NFO and Air-NFO. (e) LSV curves of Ar-NFO-S before and after 2000 cycles from 1 to 2 V vs. RHE. (f) Chronoamperometric measurement on Ar-NFO-S catalyst at 1.435 mV vs. RHE producing constant current density ~10 mA/cm2 for 150 h in 1 mol/L KOH electrolyte. (g) The OER performance of Ar-NFO-S and other Ni-based catalysts recently reported (Table S5).
Fig. 4. (a) CV curve of Ar-NFO-S, Ar-NFO, and Air-NFO in alkaline electrolytes at a scan rate of 10 mV/s. (b) Bode plots for Ar-NFO-S, Ar-NFO, and Air-NFO at a potential of 1.3 V vs. RHE. (c) Bode plots for Ar-NFO-S, Ar-NFO and Air-NFO-S at different potentials vs. RHE during OER. (d) In-suit Raman spectra of Ar-NFO-S at different potential vs. RHE during OER. (e) OER specific activities of Ar-NFO-S, Ar-NFO, and Air-NFO at 1.5 (V vs. RHE) in different pH of KOH. (f) LSV curve of Ar-NFO-S and Ar-NFO in different resolution.
Fig. 5. (a) Proposed LOMNB mechanisms on NiFe2O4 with different configurations. (b) Free energies of OER steps via LOMNB mechanisms on NiFe2O4 with different configuration. (c) Free energies of OER steps via AEM mechanisms on different site including Feoct, Nioct and Nioct adjacent to the sulfate (Nioct-S) of NiFe2O4.
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