In situ Electrochemical Transformation of Ni3S2 and Ni3S2‐Ni from Sheets to Nanodisks: Towards Efficient Electrocatalysis for Hydrogen Evolution Reaction (HER)

Busupalli, Balanagulu; Battu, Shateesh; Haram, Santosh K.; Prasad, B. L. V.

doi:10.1002/slct.201601567

Cited by 12 publications

(3 citation statements)

References 59 publications

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“…Notably, a Ni/Ni 3 S 2 composite material established by Prasad and coworkers undergoes morphological changes from nanosheets to nanodiscs upon potential cycling, reaching an overpotential of

η_{10}

=290 mV . Ni 3 S 2 has also been combined with molybdenum oxides to obtain MoO x /Ni 3 S 2 microspheres on Ni‐foam with good stability (>100 h) in 1 M KOH (

η_{10}

=106 mV) and good prospects for overall water splitting …”

Section: Metal‐rich Transition‐metal Chalcogenides For Hermentioning

confidence: 99%

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

et al. 2020

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rich chalcogenides composed of highly abundant elements recently emerged as promising catalysts for the electrocatalytic hydrogen evolution reaction (HER). Many of these materials benefit from a high intrinsic conductivity as compared to their chalcogen-rich congeners, greatly reducing the necessity for conductive additives or sophisticated nanostructuring. Herein, we showcase the high potential of metal-rich transitionmetal chalcogenides for the electrocatalytic hydrogen formation by summarizing the recent progress achieved with M 9 S 8 (pentlandite type) and M 3 S 2 (heazlewoodite type) based materials, which represent the most frequently applied compositions for this purpose. By a detailed electrochemical comparison of bulk as well as pellet electrodes of metal-rich Fe 4.5 Ni 4.5 S 8 , we also aim at raising awareness in the community for the inherent differences in catalytic properties of the materials themselves and those of the fabricated electrodes, a point that is often disregarded in reports on HER-catalyst systems.[a] Dr.

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“…Notably, a Ni/Ni 3 S 2 composite material established by Prasad and coworkers undergoes morphological changes from nanosheets to nanodiscs upon potential cycling, reaching an overpotential of

η_{10}

=290 mV . Ni 3 S 2 has also been combined with molybdenum oxides to obtain MoO x /Ni 3 S 2 microspheres on Ni‐foam with good stability (>100 h) in 1 M KOH (

η_{10}

=106 mV) and good prospects for overall water splitting …”

Section: Metal‐rich Transition‐metal Chalcogenides For Hermentioning

confidence: 99%

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

et al. 2020

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“…The HER activities of several electrode materials are compared in Table . The Tafel slope of 30 mV dec –1 and relatively low overpotential of −90 mV for the Ni/Cr 2 O 3 electrode were the lowest values observed in Table . − Typically, a low Tafel slope, which can result from strong H-adsorption onto the electrode, corresponds to high HER activity. Because of the synergistic activities between Ni and Cr 2 O 3 , the kinetic of HER increased and the Tafel slope decreased on the Ni/Cr 2 O 3 electrode compared to those of Pt.…”

Section: Resultsmentioning

confidence: 86%

Electrodeposited Nickel/Chromium(III) Oxide Nanostructure-Modified Pencil Graphite Electrode for Enhanced Electrocatalytic Hydrogen Evolution Reaction Activity

2021

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Electrolysis of water in acidic solutions is typically used in the production of electrocatalytic hydrogen. Herein, we proposed the electrochemical fabrication of the nickel/chromium(III) oxide (Ni/Cr 2 O 3 ) nanostructure-modified pencil graphite electrode (PGE) for use as an electrode in hydrogen evolution reaction (HER) in 0.5 M sulfuric acid solution. The optimal combination of nanostructures was determined based on the highest electrocatalytic performance for HER. After determining the ideal experimental conditions for fabrication of Cr 2 O 3 , Ni nanoparticles were electrochemically deposited on the Cr 2 O 3 nanostructure-modified PGE to prepare a low-cost electrocatalyst. The Ni/Cr 2 O 3 nanostructure-modified PGEs were characterized through X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. Linear sweep voltammetry, Tafel polarization curves, and electrochemical impedance spectroscopy were used for determining H + reduction (Had formation) in acidic solution on modified and unmodified electrode surfaces. This study involves the fabrication of a low-cost, stable, and highly electroactive electrode material for hydrogen production in the electrolysis of water.

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“…Due to the advantages of the wide availability of water resources, the high purity of hydrogen, and the feasibility of large‐scale production, electrochemical water splitting provides a promising method to produce hydrogen via oxygen evolution reaction (OER) . IrO 2 and RuO 2 catalysts are known to deliver excellent catalytic performance in OER .…”

Section: Introductionmentioning

confidence: 99%

Layer‐by‐Layer Coating of Cobalt‐Based Ink for Large‐Scale Fabrication of OER Electrocatalyst

et al. 2019

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The scalability and stability of electrocatalysts is one of the biggest challenges for their practical applicability. In this context, Co3O4 nanoparticles conformally coated on a light weight, 3D and highly conducting carbon cloth are fabricated using an easily synthesized cobalt hexadecylthiolate complex as ink. This method is especially useful for large‐scale production as the complex is synthesized in large quantities and coated on 3D substrates by a simple dip‐coating method. The optimum loading of the catalyst is achieved through a layer‐by‐layer (LbL) assembly of a cobalt hexadecylthiolate complex via repeated dip coating of the carbon cloth electrode in the solution. The Co3O4/CC undergoes electrochemical oxidation and converts to CoOOH as an active species and acts as a highly efficient electrocatalyst with optimized loading. The Co3O4‐16/CC with 16 times dip coating exhibits remarkable stability over 24 h with an overpotential of 300 mV at 10 mA cm−2 and a Tafel slope of 77.06 mV dec−1. The electrocatalytic activity of Co3O4‐16/CC prepared by LbL coating is better than conventional Co3O4 and comparable to IrO2 and RuO2 electrocatalysts with the future possibility of commercial‐scale production at lower cost.

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In situ Electrochemical Transformation of Ni₃S₂ and Ni₃S₂‐Ni from Sheets to Nanodisks: Towards Efficient Electrocatalysis for Hydrogen Evolution Reaction (HER)

Cited by 12 publications

References 59 publications

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

Electrodeposited Nickel/Chromium(III) Oxide Nanostructure-Modified Pencil Graphite Electrode for Enhanced Electrocatalytic Hydrogen Evolution Reaction Activity

Layer‐by‐Layer Coating of Cobalt‐Based Ink for Large‐Scale Fabrication of OER Electrocatalyst

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