In situ direct growth of flower-like hierarchical architecture of CoNi-layered double hydroxide on Ni foam as an efficient self-supported oxygen evolution electrocatalyst

Ni, Lu; Zhou, Jinhua; Chen, Ning-Na; Li, Xiaoge; Xu, Shuchi; Zhang, Ling; Lu, Chunliang; Chen, Jing; Xu, Lin; Hou, Wenhua

doi:10.1016/j.ijhydene.2020.06.139

Cited by 29 publications

(11 citation statements)

References 54 publications

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“…[ 41 ] The TOF value of NF@NiFe‐LDH‐1.5‐4 catalyst is 0.325 s −1 at an overpotential of 190 mV, being much higher than many previously reported self‐supported transition metal catalysts. [ 30,43–45 ] These results demonstrate that NF@NiFe‐LDH‐1.5‐4 exhibits an excellent OER electrocatalytic performance in alkaline electrolyte.…”

Section: Resultsmentioning

confidence: 73%

Ultrafast Room‐Temperature Synthesis of Self‐Supported NiFe‐Layered Double Hydroxide as Large‐Current–Density Oxygen Evolution Electrocatalyst

Liu

Fang

et al. 2021

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Water splitting is a promising sustainable technology to produce high purity hydrogen, but its commercial application remains a giant challenge due to the kinetically sluggish oxygen evolution reaction (OER). In this work, a time‐ and energy‐saving approach to directly grow NiFe‐layered double hydroxide (NiFe‐LDH) nanosheets on nickel foam under ambient temperature and pressure is reported. These NiFe‐LDH nanosheets are vertically rooted in nickel foam and interdigitated together to form a highly porous array, leading to numerous exposed active sites, reduced resistance of charge/mass transportation and enhanced mechanical stability. As self‐supported electrocatalyst, the representative sample (NF@NiFe‐LDH‐1.5‐4) shows an excellent large‐current–density catalytic activity for OER in alkaline electrolyte, requiring low overpotentials of 190 and 220 mV to reach the current densities of 100 and 657 mA cm−2 with a Tafel slope of 38.1 mV dec−1. In addition, NF@NiFe‐LDH‐1.5‐4 as an overall water splitting electrocatalyst can stably achieve a large current density of 200 mA cm−2 over 300 h at a low cell voltage of 1.83 V, meeting the requirement of industrial hydrogen production. This exceedingly simple and ultrafast synthesis of low‐cost and highly active large‐current–density OER electrocatalysts can propel the commercialization of hydrogen producing technology via water splitting.

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Section: Resultsmentioning

confidence: 73%

Ultrafast Room‐Temperature Synthesis of Self‐Supported NiFe‐Layered Double Hydroxide as Large‐Current–Density Oxygen Evolution Electrocatalyst

Liu

Fang

et al. 2021

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“…The slope is C dl , which is linear to the ECSA. 34 As expected, the C dl value of the CoNi/ NF bimetallic catalyst is 10.45 mF cm −2 , comparable to the 11.5 mF cm −2 reported by Hu et al, 35 and significantly higher than its monometallic counterparts Ni/NF (2.34 mF cm −2 ), Co/NF (2.30 mF cm −2 ), as well as the substrate, NF (0.80 mF cm −2 ). Compared with Co/NF, Ni/NF, and blank nickel foams, CoNi/NF alloy catalysts have a larger active area and better electrocatalytic properties, which is consistent with the FESEM results.…”

Section: Methodsmentioning

confidence: 99%

Controllable Synthesis of the Three-Dimensional Co–Ni Nanoweb Structure for Electrocatalytic Hydrogen Evolution Reaction

Zhou

Bai

Xie

et al. 2023

ACS Appl. Energy Mater.

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Nanostructuring of alloyed electrocatalysts with earth-abundant transition metals represents a promising strategy for the practical implementation of water splitting to produce hydrogen. Here, we constructed a nanoporous CoNi alloy electrocatalyst with a unique three-dimensional nanoweb structure on a nickel foam substrate. The optimized CoNi/NF electrocatalyst exhibits excellent hydrogen evolution activity with an overpotential of 52 mV and a Tafel slope of 68 mV dec–1. Furthermore, the high current density was sustained for 20 h with negligible decrease. Such superior activity and stability outperform other reported electrocatalysts, originating from the synergistic effect of Co and Ni metals and their unique porous 3D nanoweb structure, the latter are expected to create a large number of active sites for reaction. Density functional theory (DFT) calculations identified an increased density state at the Fermi energy level, which confirms the high electron density existing in the alloy structure.

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“…(ii) Pt metal have proper binding energy for H atom, which could facilitate H adsorption (iii) The mesoporous nature of FeÀ Pt/PC helps for better accessibility and fast diffusion of ions for electrochemical reaction (iv) electrode containing both Fe and Pt element has consistently demonstrated an improved electrochemical performance. [51][52][53][54][55] The HER kinetics in alkaline medium proceed through either the Volmer-Heyrvosky or Volmer -Tafel pathways. These two pathways have been involved by water molecules viz electrochemical reduction of adsorbed H 2 atom and OH ions and discharging H 2 gas.…”

Section: Hydrogen Evolution Measurement In Alkaline Mediummentioning

confidence: 99%

Nano‐MOF‐5 (Zn) Derived Porous Carbon as Support Electrocatalyst for Hydrogen Evolution Reaction

et al. 2021

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The design of an efficient electrocatalyst with controlled morphology and structural characteristics remain a challenging task for advanced electrochemical hydrogen evolution reaction (HER). Herein a simple method is utilized to improve the HER activity by introducing Fe/Pt bimetallic nanoparticles supported on highly porous carbon (PC) viz. one step carbonization of Nano-MOF-5(Zn) as precursor (metal organic framework). The as prepared Nano MOF-5(Zn), Fe/PtÀ PC and PC derived from MOF were characterized by various techniques like X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, BET (nitrogen adsorption/desorption isotherms) and Field emission scanning electron microscopy (FE-SEM). The developed FeÀ Pt/PC exhibits an optimal HER performance with low overpotential (85.4 mV) and a Tafel slope of 42.4 mV dec À 1 . The electrochemical results show that the developed material provides a viable approach for developing inexpensive Pt-based catalyst for HER.

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In situ direct growth of flower-like hierarchical architecture of CoNi-layered double hydroxide on Ni foam as an efficient self-supported oxygen evolution electrocatalyst

Cited by 29 publications

References 54 publications

Ultrafast Room‐Temperature Synthesis of Self‐Supported NiFe‐Layered Double Hydroxide as Large‐Current–Density Oxygen Evolution Electrocatalyst

Ultrafast Room‐Temperature Synthesis of Self‐Supported NiFe‐Layered Double Hydroxide as Large‐Current–Density Oxygen Evolution Electrocatalyst

Controllable Synthesis of the Three-Dimensional Co–Ni Nanoweb Structure for Electrocatalytic Hydrogen Evolution Reaction

Nano‐MOF‐5 (Zn) Derived Porous Carbon as Support Electrocatalyst for Hydrogen Evolution Reaction

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