Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (9): 2354-2362.DOI: 10.1016/S1872-2067(21)63916-5
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Yuyan Qiaoa,b,†, Yanqiu Pana,†, Jiangwei Zhangb, Bin Wangb, Tingting Wub, Wenjun Fanb, Yucheng Caob, Rashid Mehmoodb, Fei Zhangb, Fuxiang Zhangb,*()
Received:
2021-07-01
Accepted:
2021-08-05
Online:
2022-09-18
Published:
2022-07-20
Contact:
Fuxiang Zhang
About author:
First author contact:†Contributed equally to this work.
Supported by:
Yuyan Qiao, Yanqiu Pan, Jiangwei Zhang, Bin Wang, Tingting Wu, Wenjun Fan, Yucheng Cao, Rashid Mehmood, Fei Zhang, Fuxiang Zhang. Multiple carbon interface engineering to boost oxygen evolution of NiFe nanocomposite electrocatalyst[J]. Chinese Journal of Catalysis, 2022, 43(9): 2354-2362.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63916-5
Fig. 1. Schematic diagram of synthesizing NiFe-C/CNTs/CFP. (1) Deposition of Ni for growth of CNTs on the surface of CFP. (2) Synthesis of CNTs/CFP by CVD method. (3) Growth of NiFeOxHy as well as carbon doping on the CNTs/CFP. (CFP: carbon fiber paper; CVD: chemical vapor deposition; CNTs: carbon nanotubes).
Fig. 2. Electrochemical performance. (a) The LSV curves on typical catalysts and references (90% iR-corrected in 1 mol L-1 KOH measured at a scan-rate of 5 mV s-1). (b) The corresponding Tafel curves of CNTs/CFP, NiFe-C/CFP, NiFe/CNTs/CFP and NiFe-C/CNTs/CFP in 1 mol L-1 KOH, respectively. (c) TOF is normalized to the total metal molars of Ni+Fe, estimated at η = 250 mV from LSV measured at 5 mV s-1. (d) Chronopotentiometry test for NiFe-C/CNTs/CFP catalyst at 10 mA cm-2 in 1 mol L-1 KOH.
Fig. 3. Physical characterizations of electrocatalysts. (a) Raman spectra of NiFe-C. (b) XRD patterns of NiFe and NiFe-C catalyst. The bottom lines show powder diffraction profile of α-Ni(OH)2 (Black, PDF:22- 0444). (c) HRTEM image of NiFe-C/CNTs/CFP. (d) STEM image of NiFe-C/CNTs/CFP and the corresponding EDX elemental mapping of C, Ni and Fe.
Fig. 4. Characterizations of electronic structures on the typical CNTs/CFP supported electrocatalysts and references. (a) Fe K-edge XANES (inset: average chemical valence of Fe atom). (b) Ni K-edge XANES (inset: average chemical valence of Ni atom). (c) Fourier-transform EXAFS spectra of Fe edge. (d) Fourier-transform EXAFS spectra of Ni edge; (e) Fe 2p XPS spectra; (f) Ni 2p XPS spectra.
Fig. 5. Nyquist plots, the reaction order and apparent energy of activation. (a) Nyquist plots recorded for NiFe-C/CFP, NiFe/CNTs/CFP and NiFe-C/CNTs/CFP at η = 250 mV. Inset: The equivalent circuit model. (b) pH dependence of the logarithm of the exchange current for NiFe/CNTs/CFP and NiFe-C/CNTs/CFP at η = 280 mV. (c) Arrhenius plot of the inverse temperature versus the logarithm of the exchange current for NiFe/CNTs/CFP and NiFe-C/CNTs/CFP at η = 300 mV.
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