Direct growth of holey Fe3O4-coupled Ni(OH)2 sheets on nickel foam for the oxygen evolution reaction

doi:10.1016/S1872-2067(20)63639-7

Abstract

Abstract:

The oxygen evolution reaction (OER) is a half-reaction of water electrolysis, and the OER performance of an electrocatalyst is significantly related to its energy conversion efficiency. Due to their high OER activity, transition metal-based nanomaterials have become potential low-cost substitutes for Ir/Ru-based OER electrocatalysts in an alkaline environment. Herein, holey Fe₃O₄-coupled Ni(OH)₂ sheets (Ni(OH)₂-Fe H-STs) were easily achieved by a simple mixed-cyanogel hydrolysis strategy. The two-dimensional (2D) Ni(OH)₂-Fe H-STs with ca. 1 nm thickness have a high specific surface area, abundant unsaturated coordination atoms, and numerous pores, which are highly favorable for electrocatalytic reactions. Meanwhile, the introduction of Fe improves the conductivity and regulates the electronic structure of Ni. Due to their special structural features and synergistic effect between the Fe and Ni atoms, Ni(OH)₂-Fe H-STs with an optimal Ni/Fe ratio show excellent OER activity in a 1 M KOH solution, which significantly exceeds that of the commercial RuO₂nanoparticle electrocatalyst. Furthermore, Ni(OH)₂-Fe H-STs can be grown on nickel foam (NF), and the resulting material exhibits enhanced OER activity, such as a small overpotential of 200 mV and a small Tafel slope of 56 mV dec^-1, than that of Ni(OH)₂-Fe H-STs without NF.

Key words: Oxygen evolution reaction, Transition metal-based nanomaterials, Holey two-dimensional materials, Heteroatom doping, Electrocatalysis

Yu Ding, Bo-Qiang Miao, Yue Zhao, Fu-Min Li, Yu-Cheng Jiang, Shu-Ni Li, Yu Chen. Direct growth of holey Fe₃O₄-coupled Ni(OH)₂ sheets on nickel foam for the oxygen evolution reaction[J]. Chinese Journal of Catalysis, 2021, 42(2): 271-278.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63639-7

https://www.cjcatal.com/EN/Y2021/V42/I2/271

Figures/Tables 7

Fig. 1. EDX data (A), XRD patterns (B), and Fe 2p (C) and Ni 2p (D) spectra of Ni(OH)2-Fe H-STs-Ni3Fe1.

Fig. 2. SEM (A), magnified SEM (B), TEM (C), AFM (D), and STEM-EDX (E) mapping images of Ni(OH)2-Fe H-STs-Ni3Fe1.

Fig. 3. HR-TEM image (A), N2 IAD curve (B), partially magnified HR-TEM image (C), and SAED pattern (D) of Ni(OH)2-Fe H-STs-Ni3Fe1.

Fig. 4. (A) LSV polarization curves of Ni(OH)2-Fe H-STs in 1 M KOH electrolyte at 2 mV s-1; (B) Histogram of η10 at Ni(OH)2-Fe H-STs; (C) Tafel plots of Ni(OH)2-Fe H-STs for the OER; (D) Nyquist plots in 1 M KOH electrolyte at 1.5 V for Ni(OH)2-Fe H-STs with different Ni/Fe ratios.

Fig. 5. SEM images of the NF substrate (A) and Ni(OH)2-Fe H-STs-Ni3Fe1/NF (B); (C) SEM-EDX-mapping images of Ni(OH)2-Fe H-STs-Ni3Fe1/NF; (D) partially magnified SEM image of Ni(OH)2-Fe H-STs-Ni3Fe1/NF.

Fig. 6. (A) LSV polarization curves of Ni(OH)2-Fe H-STs-Ni3Fe1/NF and RuO2/NF in 1 M KOH electrolyte at 2 mV s-1; (B) the OER overpotentials at 10 and 60 mA cm-2 for Ni(OH)2-Fe H-STs-Ni3Fe1/NF and RuO2/NF; (C) Tafel plots for Ni(OH)2-Fe H-STs-Ni3Fe1/NF and RuO2/NF; (D) Chronopotentiometric curves of Ni(OH)2-Fe H-STs-Ni3Fe1/NF and RuO2/NF in 1 M KOH electrolyte at 10 mA cm-2.

Table 1 OER performance of NiFe-based nanomaterials in KOH.

Electrocatalysts	Electrolyte	η at i₁₀	Ref. (year)
Fe@Ni HNSs	1 M KOH	220	This work
Iron-doped Ni₃S₂ sheets	1 M KOH	295	[59] 2019
Ni₂Fe₁ nanometer pearl necklaces	1 M KOH	240	[60] 2019
NiFe-co-doped polymeric carbon nitride	1 M KOH	310	[61] 2019
NiFe/MoS₂ sheets	1 M KOH	260	[62] 2019
Ni-Fe-P/NF	1 M KOH	229	[63] 2019
Fe-doped NiCo-LDH	1 M KOH	285	[64] 2019
F-NiFe LDH	1 M KOH	225	[29] 2019
NiCoFe alloy nanoparticles	1 M KOH	320	[65] 2019
NiCoFeB nanochains	1 M KOH	284	[62] 2019
CoFe₂O₄ sheets	1 M KOH	275	[66] 2019
Fe-Ni-Mo nitride porous nanotubes	1 M KOH	228	[67] 2018
Ni_0.83Fe_0.17(OH)₂sheets	1 M KOH	245	[32] 2018
Ni_0.67Fe_0.33/C sheets	1 M KOH	325	[68] 2018
N-CoFe LDHs	1 M KOH	233	[69] 2018
Vacancies Ni-NiFe LDHs	1 M KOH	245 229	[70] 2018
Fe-doped Ni(OH)₂ sheets	1 M KOH	271	[71] 2018
Ni-Co-Fe hydroxides/N-doped carbon nanoplates	0.1 M KOH	250	[72] 2018
Fe-Co-P alloy nanospheres	1 M KOH	252	[73] 2018
Bimetallic Ni-Fe phosphide nanocomposites	1 M KOH	233	[74] 2018
Fe/Ni/CoMn-MIL-53 nanostructures	1 M KOH	236	[75] 2018
Ni-Fe-O nanowires	1 M KOH	224	[76] 2018
Mo-doped Ni-Fe oxide nanowires	1 M KOH	231	[77] 2018
Ni-Co-Fe hollow multivoid nanocuboids	0.1 M KOH	320	[78] 2018

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Direct growth of holey Fe₃O₄-coupled Ni(OH)₂ sheets on nickel foam for the oxygen evolution reaction

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