Electrochemically activated Ni@Ni(OH)2 heterostructure as efficient hydrogen evolution reaction electrocatalyst for anion exchange membrane water electrolysis

Guo, Wenwu; Kim, J.; Kim, H.; Hong, Soon-Dal; Kim, H.; Kim, Soo Young; Ahn, Sang Hyun

doi:10.1016/j.mtchem.2022.100994

Cited by 7 publications

(6 citation statements)

References 56 publications

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“…6a, the current density of the NiMnS/Ti-based electrolyzer was up to 0.9 A cm −2 at a voltage of 2.0 V (the third test) when 1.0 M KOH was used as a flowing electrolyte. This value was similar to that of the Pt/C/CP-based electrolyzer reported in our previous work 26 and higher than those of the HER catalysts used in existing AEMWE devices (Table S2†). The sudden decrease in the cell voltage in the first test was attributable to the activation process prior to the water electrolysis.…”

Section: Resultssupporting

confidence: 87%

“…The NiS/Ti framework exhibited a Ni 0 peak at 852.8 eV. 26 The two peaks located at 856.0 and 873.7 eV, along with adjacent peaks at 861.3 and 879.5 eV, corresponded to Ni 2p 3/2 and Ni 2p 1/2 and related satellite peaks, respectively, suggesting the presence of Ni 2+ from the Ni–S bonds. 35–37 With the Mn doping, the peaks of the Ni spectra of NiMnS/Ti shifted to lower binding energies by 0.3 eV, indicating that the electronic structure of Ni was regulated by the Mn atoms, and the Ni 0 peak completely disappeared.…”

Section: Resultsmentioning

confidence: 96%

“…The overpotential obtained from the I – V curve was divided into the ohmic overpotential ( η ohm ), kinetic overpotential ( η kin ), and mass transfer overpotential ( η mass ), and the overpotential values were analyzed. 25,26…”

Section: Methodsmentioning

confidence: 99%

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Constructing a NiMnS electrode with a Mn-rich surface for hydrogen production in anion exchange membrane water electrolyzers

Guo,

Kim,

Hong

et al. 2023

Dalton Trans.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 96%

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Constructing a NiMnS electrode with a Mn-rich surface for hydrogen production in anion exchange membrane water electrolyzers

Guo,

Kim,

Hong

et al. 2023

Dalton Trans.

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“…The reason for the application of this exact method is the anodic oxidation of the pure Ni catalysts, as it has been reported that Ni/Ni(OH) 2 and Ni/NiO catalysts develop high efficiencies towards the HER [ 24 , 39 , 40 , 41 , 42 ]. The formation of the surface oxides starts with the formation of α-Ni(OH) 2 at low anodic potentials.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Evolution Reaction on Ultra-Smooth Sputtered Nanocrystalline Ni Thin Films in Alkaline Media—From Intrinsic Activity to the Effects of Surface Oxidation

Neumüller,

Rafailović,

Jovanović

et al. 2023

Nanomaterials

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Highly effective yet affordable non-noble metal catalysts are a key component for advances in hydrogen generation via electrolysis. The synthesis of catalytic heterostructures containing established Ni in combination with surface NiO, Ni(OH)2, and NiOOH domains gives rise to a synergistic effect between the surface components and is highly beneficial for water splitting and the hydrogen evolution reaction (HER). Herein, the intrinsic catalytic activity of pure Ni and the effect of partial electrochemical oxidation of ultra-smooth magnetron sputter-deposited Ni surfaces are analyzed by combining electrochemical measurements with transmission electron microscopy, selected area electron diffraction, X-ray photoelectron spectroscopy, and atomic force microscopy. The experimental investigations are supplemented by Density Functional Theory and Kinetic Monte Carlo simulations. Kinetic parameters for the HER are evaluated while surface roughening is carefully monitored during different Ni film treatment and operation stages. Surface oxidation results in the dominant formation of Ni(OH)2, practically negligible surface roughening, and 3–5 times increased HER exchange current densities. Higher levels of surface roughening are observed during prolonged cycling to deep negative potentials, while surface oxidation slows down the HER activity losses compared to as-deposited films. Thus, surface oxidation increases the intrinsic HER activity of nickel and is also a viable strategy to improve catalyst durability.

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“…Additionally, it can enhance the conductivity of the electrode, reduce the contact resistance between the substrate and the catalytically active material, and increase its long-lasting stability. [13][14][15][16] Figure 2 depicts a schematic diagram of Ni deposition on a Cu substrate. 14 In addition to the aforementioned preparation methods, researchers also employed wet chemistry to fabricate ultrathin LMH nanosheets, 17 utilized the vapor deposition method to prepare a-MoS 2 NA/CC electrocatalysts for HER, 18 employed electrostatic spinning to prepare NiCoP/CF_PAN-PVP electrocatalysts for cathodes, 19 and utilized chemical etching to prepare NiFeCo/NF electrocatalysts for high-performance HER and OER reactions.…”

Section: Preparation Of Self-supporting Electrocatalysts For Alkaline...mentioning

confidence: 99%

Review—Self-Supporting Electrocatalysts for HER in Alkaline Water Electrolysis

Zhang,

Song

2024

J. Electrochem. Soc.

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Hydrogen is a prime candidate for replacing fossil fuels. Electrolyzing water to produce hydrogen stands out as a particularly clean method, garnering significant attention from researchers in recent years. Among the various techniques for electrolyzing water to produce hydrogen, alkaline electrolysis holds the most promise for large-scale industrialization. The key to advancing this technology lies in the development of durable and cost-effective electrocatalysts for the hydrogen evolution reaction (HER). Self-supporting electrode is an electrode structure in which a catalyst layer is formed directly on a substrate (such as carbon cloth, nickel foam, stainless steel, etc.) without using a binder and with good structural stability. In contrast to traditional nanocatalysts, self-supporting electrocatalysts offer significant advantages, including reduced resistance, enhanced stability, and prolonged usability under high currents. This paper reviews recent advancements in HER electrochemical catalysts for alkaline water electrolysis, focusing on the utilization of hydrogen-evolving catalysts such as metal sulfides, phosphides, selenides, oxides, and hydroxides. With self-supported electrocatalysts as the focal point, the paper delves into progress made in their preparation techniques, structural design, understanding of reaction mechanisms, and strategies for performance enhancement. Ultimately, the future development direction of promoting hydrogen evolution by self-supported electrocatalysts in alkaline water electrolysis is summarized.

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Electrochemically activated Ni@Ni(OH)2 heterostructure as efficient hydrogen evolution reaction electrocatalyst for anion exchange membrane water electrolysis

Cited by 7 publications

References 56 publications

Constructing a NiMnS electrode with a Mn-rich surface for hydrogen production in anion exchange membrane water electrolyzers

Constructing a NiMnS electrode with a Mn-rich surface for hydrogen production in anion exchange membrane water electrolyzers

Hydrogen Evolution Reaction on Ultra-Smooth Sputtered Nanocrystalline Ni Thin Films in Alkaline Media—From Intrinsic Activity to the Effects of Surface Oxidation

Review—Self-Supporting Electrocatalysts for HER in Alkaline Water Electrolysis

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