In Situ Synthesis of Copper Sulfide‐Nickel Sulfide Arrays on Three‐Dimensional Nickel Foam for Overall Water Splitting

Bhat, Karthik S.; Nagaraja, H.S.

doi:10.1002/slct.202000026

Cited by 37 publications

(12 citation statements)

References 62 publications

(37 reference statements)

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“…This shift was also observed in the binding energy, which is clear evidence with Cu2p 3/2 peak positions, as reported earlier 11 . Figure 5D indicates the HR‐XPS spectrum of O1s in CuO material 28 . Two peaks identified in 531.4 eV, which associated with O 2− in CuO and 529.5 eV is correlated to the adsorbed oxygen, respectively.…”

Section: Resultssupporting

confidence: 83%

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Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

et al. 2020

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We demonstrate a simple template-free green method to prepare copper oxide (CuO) nanoporous material using copper acetate as a single precursor with Piper nigrum (Indian black pepper) dried fruit extract as a reducing medium under microwave irradiation. The surface properties and morphology of the obtained CuO material were assessed using powder X-ray diffractometer, X-ray photoelectron spectrometer, field-emission scanning electron microscope with elemental mapping analysis, focused ion beam high-resolution transmission electron microscope, and N 2 adsorption-isotherm techniques. The characterization results reveal that the prepared CuO is a single monoclinic crystalline phase, and nanoporous in morphology with a specific surface area of 81.23 m 2 g −1 and containing pore sizes between 3-8 nm. Nanoporous CuO showed excellent electrochemical energy storage performance with the specific capacitance of 238 Fg −1 at 5 mVs −1 when compared with commercially available CuO (75 Fg −1). Also, nanoporous CuO showed efficient desalting performance in the capacitive deionization system. This eco-friendly synthesis derived nanoporous CuO can be applied as high-performance supercapacitor material for high-energy storage devices and desalination processes.

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Section: Resultssupporting

confidence: 83%

“…11 Figure 5D indicates the HR-XPS spectrum of O1s in CuO material. 28 Two peaks identified in 531.4 eV, which associated with O 2− in CuO and 529.5 eV is correlated to the adsorbed oxygen, respectively.…”

Section: Characterizationsmentioning

confidence: 99%

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

et al. 2020

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“…Another promising approach in the field of high temperature Solid Oxide fuel cells is to promote the electrocatalytic activity of Ni‐based electrodes, through the dispersion of small amounts of noble (eg, Pt, Pd, Rh, Ru, Au) or non‐noble transition metal elements (eg, Sn, Cu, Mo, Bi) 9,14 . There are also similar trends in the field of low temperature (liquid) water electrolysis applications, such as those recently published by K. S. Bhat and H. S. Nagaraja, who reported nickel chalcogenides 15 (sulfides, selenides and tellurides) as promising substitutes of the State of the Art (SoA) (Pt, IrO 2 , RuO 2 ) electrocatalysts, as well as formulations based on copper sulfide‐nickel sulfide arrays 16 . Albeit the status of modified Solid Oxide Ni‐based fuel cell electrodes, the research level in the case of electrolysis is currently in progress.…”

Section: Introductionsupporting

confidence: 60%

“…9,14 There are also similar trends in the field of low temperature (liquid) water electrolysis applications, such as those recently published by K. S. Bhat and H. S. Nagaraja, who reported nickel chalcogenides 15 (sulfides, selenides and tellurides) as promising substitutes of the State of the Art (SoA) (Pt, IrO 2 , RuO 2 ) electrocatalysts, as well as formulations based on copper sulfidenickel sulfide arrays. 16 Albeit the status of modified Solid Oxide Ni-based fuel cell electrodes, the research level in the case of electrolysis is currently in progress. Indicatively, there are recent experimental studies reporting that the electrocatalytic performance of Ni-based fuel electrodes for H 2 O or CO 2 electrolysis and H 2 O/CO 2 coelectrolysis can be improved through alloying with metals such as Rh, Ru, Co and Pd.…”

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confidence: 99%

The promoting effect of Fe on Ni/ GDC for the Solid Oxide H ₂ O electrolysis

et al. 2020

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The study deals with the modification of commercial Ni/GDC powder with iron and its use as fuel functional electrode for Solid Oxide H 2 O electrolysis. The Fe-NiO/GDC samples were prepared with the Deposition-Precipitation method and characterized, in their oxidized and reduced form, by using BET, HR-TEM, SAED, XRD, XPS and TG analysis in the presence of H 2 O. The electrochemical investigation deals with the comparison of single SOECs at 900 C, under various pH 2 O/pH 2 ratios. In the oxidized powders iron was detected, both in the bulk and on the surface, in the form of crystallized Fe 2 O 3 species, which during H 2-reduction interacted with NiO towards the formation of a Ni-Fe alloy. The latter promoted the electrochemical performance of the Fe-Ni/ GDC electrodes, where there are indications of strong dependence on the Fe wt% content. Specifically, the performance of the cell with 0.5 wt% Fe-Ni/GDC was threefold higher than that with Ni/GDC. On the other hand, the cell with 2 wt% Fe-Ni/GDC was worse, implying that the promoting effect of Fe lies on quite low wt% content. Finally, the examined Fe-doped electrodes exhibited increase of polarization in high pH 2 O. This is primarily ascribed to the fact that Fe-Ni/GDC electrodes seem more susceptible to H 2 O oxidation. Overall, Fe is considered as a promising Ni/GDC dopant, capable to substitute noble metals like Au, but further investigation is required for the elucidation of key preparation and performance parameters.

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“…Overpotential of 149 mV and 329 mV at a current density of 10 mA cm À 2 recorded for OER and HER (Figure 28b and 28c) resulted in construction of a two-electrode cell (Cu 2 S-Ni 3 S 2 @NF(+)II(À ) Cu 2 SÀ Ni 3 S 2 @NF) for overall water splitting with a cell-voltage of 1.87 V at 10 mA cm À 2 (Figure 28d) and strikingly long stability of 100 h at a current density of 20 mA cm À 2 . [86] [a] In 0.5 M H 2 SO 4 as electrolyte. [b] Recorded at 50 mA cm À 2 current density.…”

Section: Interlocked 3d Cu 2 Sà Ni 3 S 2 Cube-like Arraymentioning

confidence: 99%

Recent Progress on Copper‐Based Electrode Materials for Overall Water‐Splitting

2021

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Exponential increase in fossil fuel consumption demands an immediate alternative for a sustainable development. Furthermore, fossil fuel combustion releases a large quantity of CO 2 every day. In the quest for an alternative, although hydrogen is found to be a potent fuel with zero carbon waste, bulk-scale hydrogen production via steam reforming or partial oxidation of hydrocarbons produces tons of CO and CO 2 as waste. Perhaps, hydrogen production by means of electrocatalytic water splitting remains a viable and less energy-intensive approach. However, the potential bottlenecks of the water splitting are the large thermodynamic barrier and sluggish kinetics of the oxygen evolution reaction (OER) associated with the hydrogen evolution reaction (HER), a comparatively straight-forward reaction. Efforts over the last few decades have made it possible to design very reactive noble-metal-based catalysts, using Pt, IrO 2 , and RuO 2 , which dramatically diminish the working potential and enhance the rate of water oxidation. Nonetheless, the scarcity of these rare-earth metals precludes their physical implication and leads to the design of active transition-metal catalysts like CoO x and FeNi(O)OH as key alternatives. However, copper, a highly conductive and one of the earth's most abundant metals, has not much been explored for electrode materials. Lately, copper-based materials have been employed as successful catalysts for not only the OER and HER (individual half-cell reactions), but also for overall water splitting (OWS) through the design of bifunctional copper catalysts. This review summarizes the recent developments of copper-based electrode materials for electrocatalytic water splitting, with emphasis on OER, HER, and OWS studies. Moreover, Cu materials are categorized by means of counter anions present and based on their catalytic activity (mono-and/ or bi-functional behavior). Future scope and challenges to develop active Cu-based materials, as non-noble and earth abundant catalysts for sustainable energy studies, are highlighted.

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In Situ Synthesis of Copper Sulfide‐Nickel Sulfide Arrays on Three‐Dimensional Nickel Foam for Overall Water Splitting

Cited by 37 publications

References 62 publications

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

The promoting effect of Fe on Ni/ GDC for the Solid Oxide H ₂ O electrolysis

Recent Progress on Copper‐Based Electrode Materials for Overall Water‐Splitting

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In Situ Synthesis of Copper Sulfide‐Nickel Sulfide Arrays on Three‐Dimensional Nickel Foam for Overall Water Splitting

Cited by 37 publications

References 62 publications

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

The promoting effect of Fe on Ni/ GDC for the Solid Oxide H 2 O electrolysis

Recent Progress on Copper‐Based Electrode Materials for Overall Water‐Splitting

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The promoting effect of Fe on Ni/ GDC for the Solid Oxide H ₂ O electrolysis