Flame-like Ni(OH)2 strongly promotes the dissociation of water and can be used to produce an excellent hybrid electrocatalyst for the hydrogen evolution reaction in alkaline media

Zhou, Yun; Sun, Changning; Yang, Xigang; Zou, Gang; Wu, Hongjing; Xi, Shengqi

doi:10.1016/j.elecom.2018.05.010

Cited by 21 publications

(3 citation statements)

References 37 publications

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“…The interplanar distances in different lattice fringes are calculated to be 0.20 and 0.23 nm for (111) and (101) planes of Ni(0) and Ni(OH) 2 ion, respectively. The interplanar distance values for Ni(0) and Ni(OH) 2 are well-matched with those in the literature. , The crystalline nature of the Ni/Ni(OH) 2 /NiOOH sample is further confirmed from selected area electron diffraction (SAED) analysis (Figure d). The selected area diffraction pattern exhibits various diffraction rings, which could be indexed to (006), (100), and (110) planes for NiOOH and Ni(OH) 2 , respectively.…”

Section: Resultssupporting

confidence: 85%

Aggregates of Ni/Ni(OH)₂/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution

Rathore

Sharma

et al. 2020

Langmuir

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The development of an efficient electrocatalyst for hydrogen evolution reaction (HER) is essential to facilitate the practical application of water splitting. Here, we aim to develop an electrocatalyst, Ni/Ni(OH)2/NiOOH, via electrodeposition technique on carbon cloth, which shows efficient activity and durability for HER in an alkaline medium. Phase purity and morphology of the electrodeposited catalyst are determined using powder X-ray diffraction and electron microscopic techniques. The compositional and thermal stability of the catalyst is checked using X-ray photoelectron spectroscopy and thermogravimetry analysis. Electrodeposited Ni/Ni(OH)2/NiOOH material is an efficient, stable, and low-cost electrocatalyst for hydrogen evolution reaction in a 1.0 M KOH medium. The catalyst exhibits remarkable performance, achieving a current density of 10 mA/cm2 at a potential of −0.045 V vs reversible hydrogen electrode (RHE), and the Tafel slope value is 99.6 mV/dec. The overall electrocatalytic water splitting mechanism using Ni/Ni(OH)2/NiOOH catalyst is well explained, where formation and desorption of OH– ion on the catalyst surface are significant at alkaline pH. The developed electrocatalyst shows significant durability up to 200 h in a negative potential window in a highly corrosive alkaline environment along with efficient activity. The electrocatalyst can generate 165.6 μmol of H2 in ∼145 min of reaction time with 81.5% faradic efficiency.

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Section: Resultssupporting

confidence: 85%

Aggregates of Ni/Ni(OH)₂/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution

Rathore

Sharma

et al. 2020

Langmuir

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“…The corresponding Tafel slope (as shown in Figure 4b) of Ni 3 S 2 /NF-DH is found to be 68 mV dec À 1 toward HER, which is much smaller than that of Ni 3 S 2 /NF-SH (120 mV dec À 1 ) and NF (130 mV dec À 1 ), implying the faster HER kinetic of Ni 3 S 2 /NF-DH in water dissociation. [23] The homodispersed is in favor of increasing electron density and facilitating the adsorption of H atoms and the generation of H 2 .…”

Section: Resultsmentioning

confidence: 99%

Facile Dynamic Synthesis of Homodispersed Ni₃S₂ Nanosheets as a High‐Efficient Bifunctional Electrocatalyst for Water Splitting

Chen

et al. 2019

ChemCatChem

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It is extremely significant but still challenging to develop effective and stable electrocatalysts for water splitting, which is recommended as a promising technology to produce hydrogen. Herein, leaf‐like Ni3S2 nanosheets grown on the nickel foam fabricated by a novel one‐step dynamic hydrothermal method is demonstrated. Based on the new method, such catalyst with high and uniform dispersion exhibits superior activity and stability for both hydrogen evolution reaction and oxygen evolution reaction in basic electrolyte. Moreover, the as‐prepared Ni3S2 as two electrode catalysts of overall water splitting exhibits remarkable bifunctional activities with a small cell voltage of 1.45 V at a current density of 10 mA cm−2. This work can provide a new prospect for optimizing Ni3S2 growth to enhance its electrocatalytic performances.

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“…Thus, considerable effort has been devoted to the preparation of potentially cheaper catalysts based on earth-abundant first row transition metals (Fe, Co, Ni) and their combinations, together with 2D carbon materials (graphene, g-C 3 N 4 , etc.). Common approaches to catalyst development include the construction of nanomaterials of different scales and morphology, − composed of noble metal particles with cheaper metal oxides, hydroxides, nitrides, phosphides, and sulfides or with the introduction of defects and/or doping of N, P, S, and B atoms in to 2D carbon materials to improve their electronic structures. − …”

Section: Introductionmentioning

confidence: 99%

Cobalt(II) and Nickel(II) Complexes of a PNN Type Ligand as Photoenhanced Electrocatalysts for the Hydrogen Evolution Reaction

Zhang

Chen

et al. 2020

Inorg. Chem.

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Hydrogen will be an important energy vector of the future, and improved efficiency in electrohydrolysis will accelerate this transition. In a fundamental study, we have prepared Co(II) and Ni(II) complexes of a new PNN type ligand N-((diphenylphosphanyl)methyl)-2-amino-1,10-phenanthroline (dppmaphen) incorporating the photoactive 1,10-phenanthroline group and the strongly coordinating diphenylphosphine to obtain photoelectrochemical (PEC) catalysts [Co(dppmaphen)2(NO3)2] (1) and [Ni(dppmaphen)2Cl]Cl (2) which catalyzed the hydrogen evolution reaction (HER) in alkaline media (1 M KOH). Overpotentials (η10) of 430 (1) and 364 mV (2) could be reduced to 345 (1) and 284 mV (2) under Xe light irradiation. This irradiation generated photocurrent responses of 528 (1) and 357 uA/cm2 (2). Density function theory (DFT) calculation on the frontier orbitals of 1 and 2 were useful in understanding these differences in catalytic performance.

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Flame-like Ni(OH)2 strongly promotes the dissociation of water and can be used to produce an excellent hybrid electrocatalyst for the hydrogen evolution reaction in alkaline media

Cited by 21 publications

References 37 publications

Aggregates of Ni/Ni(OH)₂/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution

Aggregates of Ni/Ni(OH)₂/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution

Facile Dynamic Synthesis of Homodispersed Ni₃S₂ Nanosheets as a High‐Efficient Bifunctional Electrocatalyst for Water Splitting

Cobalt(II) and Nickel(II) Complexes of a PNN Type Ligand as Photoenhanced Electrocatalysts for the Hydrogen Evolution Reaction

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Flame-like Ni(OH)2 strongly promotes the dissociation of water and can be used to produce an excellent hybrid electrocatalyst for the hydrogen evolution reaction in alkaline media

Cited by 21 publications

References 37 publications

Aggregates of Ni/Ni(OH)2/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution

Aggregates of Ni/Ni(OH)2/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution

Facile Dynamic Synthesis of Homodispersed Ni3S2 Nanosheets as a High‐Efficient Bifunctional Electrocatalyst for Water Splitting

Cobalt(II) and Nickel(II) Complexes of a PNN Type Ligand as Photoenhanced Electrocatalysts for the Hydrogen Evolution Reaction

Contact Info

Product

Resources

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Aggregates of Ni/Ni(OH)₂/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution

Aggregates of Ni/Ni(OH)₂/NiOOH Nanoworms on Carbon Cloth for Electrocatalytic Hydrogen Evolution

Facile Dynamic Synthesis of Homodispersed Ni₃S₂ Nanosheets as a High‐Efficient Bifunctional Electrocatalyst for Water Splitting