Chinese Journal of Catalysis ›› 2024, Vol. 61: 192-204.DOI: 10.1016/S1872-2067(24)60030-6
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Xianbiao Hou,1, Chen Yu,1, Tengjia Ni, Shucong Zhang, Jian Zhou, Shuixing Dai, Lei Chu*(), Minghua Huang*(
)
Received:
2024-01-21
Accepted:
2024-03-26
Online:
2024-06-18
Published:
2024-06-20
Contact:
* E-mail: About author:
1Contributed equally to this work.
Supported by:
Xianbiao Hou, Chen Yu, Tengjia Ni, Shucong Zhang, Jian Zhou, Shuixing Dai, Lei Chu, Minghua Huang. Constructing amorphous/crystalline NiFe-MOF@NiS heterojunction catalysts for enhanced water/seawater oxidation at large current density[J]. Chinese Journal of Catalysis, 2024, 61: 192-204.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60030-6
Fig. 1. (a) Schematic illustration for the fabrication of the NiFe-MOF@NiS/NF. SEM image (b) and TEM image (c) of NiS/NF. SEM image (d) and TEM image (e) of NiFe-MOF/NF. SEM image (f), TEM image (g), HR-TEM image (h), the enlarged HR-TEM image (i) (The inset is the SAED pattern), HAADF-STEM image and corresponding elemental mapping images (j) of NiFe-MOF@NiS/NF.
Fig. 2. Powder XRD patterns (a) and Raman spectra (b) of NiS/NF, NiFe-MOF/NF and NiFe-MOF@NiS/NF. The high resolution XPS spectra of Ni 2p (c), Fe 2p (d), O 1s (e), S 2p (f) for NiS/NF, NiFe-MOF/NF and NiFe-MOF@NiS/NF. The droplet contact angle and the bubble contact angle images of NiS/NF (g), NiFe-MOF/NF (h), and NiFe-MOF@NiS/NF (i).
Fig. 3. The calculated OER free-energy diagram of NiS, NiFe-MOF, and NiFe-MOF@NiS at U = 0 V (a) and U = 1.23 V (b). Charge density difference (c) and energy band diagram (d) of NiFe-MOF@NiS. The DOS of NiS (e), NiFe-MOF (f) and NiFe-MOF@NiS (g). The d-band centers of NiS (h), NiFe-MOF (i) and NiFe-MOF@NiS (j). (k) Proposed OER pathway for the NiFe-MOF@NiS.
Fig. 4. The electrochemical measurements in 1 mol L-1 KOH. LSV curves (a), corresponding Tafel slopes (b), and the EIS (c) of NiS/NF, NiFe-MOF/NF, and NiFe-MOF@NiS/NF. (d) Comparison of the overpotential needed at 100 mA cm-2 among the NiFe-MOF@NiS/NF and previously reported catalysts in 1 mol L-1 KOH. the Cdl values (e), the mass activity (f), and specific activities (g) of NiS/NF, NiFe-MOF/NF, and NiFe-MOF@NiS/NF. (h) The LSV curves before and after 10000 cycles and (i) the time-dependent potential curve at 100 mA cm-2 for NiFe-MOF@NiS/NF.
Fig. 5. TEM (a) and HR-TEM (b) images of NiFe-MOF@NiS/NF after OER test. The high resolution XPS spectra of Ni 2p (c), Fe 2p (d), O 1s (e), and S 2p (f) for NiFe-MOF@NiS/NF before and after OER test. (g) In situ ATR-FTIR spectra of NiFe-MOF@NiS/NF. (h) Schematic graphs of performance interpretation of the NiFe-MOF@NiS/NF.
Fig. 6. The electrochemical measurements in alkaline seawater electrolytes. The LSV curves (a) and corresponding Tafel slopes (b) for NiS/NF, NiFe-MOF/NF, NiFe-MOF@NiS/NF, and RuO2. (c) The EIS of NiS/NF, NiFe-MOF/NF, and NiFe-MOF@NiS/NF. (d) Comparison of the overpotential needed at 100 mA cm-2 among the NiFe-MOF@NiS/NF and previously reported catalysts in alkaline seawater. The Cdl values (e), the TOF (f) (the inset is the TOF value at the overpotential of 370 mV), the mass activity (g) of NiS/NF, NiFe-MOF/NF, and NiFe-MOF@NiS/NF. LSV curves before and after 10000 cycles (h), the multi-potential steps curves (i), and the time-dependent potential curve (j) at 100 mA cm-2 for NiFe-MOF@NiS/NF.
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