Chinese Journal of Catalysis ›› 2023, Vol. 44: 127-138.DOI: 10.1016/S1872-2067(22)64190-1
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Qixian Xiea, Dan Renb, Lichen Baic, Rile Ged, Wenhui Zhoud, Lu Baie, Wei Xiee, Junhu Wangd,*(), Michael Grätzelb, Jingshan Luoa,*(
)
Received:
2022-06-13
Accepted:
2022-08-04
Online:
2023-01-18
Published:
2022-12-08
Contact:
Junhu Wang, Jingshan Luo
Supported by:
Qixian Xie, Dan Ren, Lichen Bai, Rile Ge, Wenhui Zhou, Lu Bai, Wei Xie, Junhu Wang, Michael Grätzel, Jingshan Luo. Investigation of nickel iron layered double hydroxide for water oxidation in different pH electrolytes[J]. Chinese Journal of Catalysis, 2023, 44: 127-138.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64190-1
Fig. 1. Electrochemical OER performance and operado spectroscopic measurements of the pristine NiFe LDH. Cyclic voltammetry curves (a) and Tafel slopes (b) of NiFe LDH tested in the different electrolytes (0.1 mol L?1 KOH, pH = 13; 0.1 mol L?1 BBS, pH = 9.2; 0.1 mol L?1 PBS, pH = 7, the scan rate is 10 mV s?1). The operando SERS of NiFe LDH acquired in the potential range from 1.0?1.7 V vs. RHE in 0.1 mol L?1 KOH (c), 0.1 mol L?1 BBS (d), 0.1 mol L?1 PBS (e) (potential step size is 100 mV); the operando 57Fe Mo?ssbauer spectra of NiFe LDH collected at different pH electrolytes: (f) 1.57 V vs. RHE, 0.1 mol L?1 KOH, pH = 13. (g) 2.17 V vs. RHE, 0.1 mol L?1 BBS, pH 9.2; (h) 2.17 V vs. RHE, 0.1 mol L?1 PBS, pH = 7.
Fig. 2. Spectroscopic characterizations of NiFe CVA500 sample. XPS spectra results of Ni 2p (a), Fe 2p (b), ex-situ Raman spectra (c), and ex-situ 57Fe Mo?ssbauer spectrum (d) of NiFe CVA500.
Fig. 3. Electrochemical OER performance and in-situ/operando spectroscopy measurements of the NiFe CVA500. (a) CV curves of NiFe CVA500 in the different pH electrolytes. (b) Tafel slopes of the NiFe CVA500 samples in the different pH electrolytes; operando Raman spectra of pristine NiFe CVA500 acquired in the potential range 1.0?1.7 V vs. RHE in 0.1 mol L?1 KOH (c), 0.1 mol L?1 BBS (d), and 0.1 mol L?1 PBS (e). The measurements were performed potentiostatically. Operando Mo?ssbauer spectra of NiFe CVA500 collected at high potential in different pH electrolytes: (f) 0.1 mol L?1 PBS, pH = 7.0 (2.17V vs. RHE). (g) 0.1 mol L?1 BBS, pH = 9.2 (2.17 V vs. RHE). (h) 0.1 mol L?1 KOH, pH = 13 (1.77 V vs. RHE).
Fig. 4. Electrochemical response to methanol of pristine NiFe LDH in different electrolytes (0.5 mol L?1 KOH/BBS/PBS with and without 0.5 mol L?1 methanol). CV curves for NiFe LDH in different electrolytes: (a) 0.5 mol L?1 KOH; (c) 0.5 mol L?1 BBS; (e) 0.5 mol L?1 PBS. Schematic energy profile for the NiFe based electrocatalysts for OER process in different pH conditions: (b) the alkaline condition; (d) the near neutral condition; (f) the neutral condition. The inset Figure shows enlarged CV curves at the low current region, and the scan rate is 50 mV s?1 (the solid line is with 0.5 mol L?1 methanol, and the dashed line is without methanol).
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