| Citation: |
Wenqiang Wu, Kaihang Yue, Kang Zhang, Jingcheng Xu, Xia Bao Yu, Yan Ya, Xianying Wang. Ionic liquid induced controllable synthesis of nickel-hydroxide-encapsulated NiFe layered double hydroxide for efficient oxygen evolution[J]. Energy Lab, 2023, 1(3): 220020. doi: 10.54227/elab.20220020
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Ionic liquid induced controllable synthesis of nickel-hydroxide-encapsulated NiFe layered double hydroxide for efficient oxygen evolution
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Abstract
The efficiency of electrochemical water splitting is severely restricted by the slow oxygen evolution reaction (OER) on the anode. Therefore, the design and synthesis of high-performance electrocatalysts for anodic oxygen evolution is crucial for the industrialization of hydrogen production by electrolysis of water. Herein, an efficient core-shell Ni(OH)2@NiFe LDH electrocatalyst was designed with the assistant of ionic liquid for OER. The ionic liquid delayed the crystallization ability of Ni2+ ions and then facilitated the formation of NiFe LDH coated Ni(OH)2 structure. The as-obtained core-shell Ni(OH)2@NiFe LDH exhibited outstanding OER electrocatalytic activity that only required overpotentials of 258 mV to deliver current densities of 100 mA cm−2, and a decent stability of at least 300 h under a large current density of 100 mA cm−2. This study provides a valuable reference for the structure design of NiFe LDH based catalyst.
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Wenqiang Wu, Kaihang Yue, Kang Zhang, Jingcheng Xu, Xia Bao Yu, Yan Ya, Xianying Wang. Ionic liquid induced controllable synthesis of nickel-hydroxide-encapsulated NiFe layered double hydroxide for efficient oxygen evolution[J]. Energy Lab, 2023, 1(3): 220020. doi: 10.54227/elab.20220020
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Figure 1.
Schematic illustration of the formation and transform the process of Ni(OH)2@NiFe LDH.
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Figure 2.
a-b SEM images, c TEM image, d HRTEM (inset shows the corresponding SAED pattern), and e HAADF-STEM, f line scanning profiles of Ni, Fe, O, N, B, and F recorded along the line shown in e, and g-l element mapping of the Ni(OH)2@NiFe LDH.
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Figure 3.
a XRD patterns, b Raman spectra of the Ni(OH)2@NiFe LDH and NiFe LDH. c FT-IR spectra of Ni(OH)2@NiFe LDH, NiFe LDH, and BMIMBF4. XPS spectra for Ni(OH)2@NiFe LDH and NiFe LDH d Ni 2p, e Fe 2p, f O 1s, g N 1s, h B 1s, i F 1s.
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Figure 4.
a LSV curves, b Tafel slopes, c Nyquist plots (inset: equivalent circuit model), d Cdl values, and e The amount of H2 and O2 catalyzed by the Ni(OH)2@NiFe LDH || NiFe LDH/Ni NCs f Chronoamperometric curves for the OER. g Polarization curves of the AEMWE cell using Ni(OH)2@NiFe LDH || NiFe LDH/Ni NCs on Ni foam (inset: the AEMWE cell photograph). h The durability of the AEMWE cell at different current densities.
