Magnetic CoPt nanoparticle-decorated ultrathin Co(OH)<sub>2</sub> nanosheets: an efficient bi-functional water splitting catalyst

Malik, Bibhudatta; Anantharaj, Sengeni; Karthick, K.; Pattanayak, Deepak K.; Kundu, Subrata

doi:10.1039/c7cy00309a

Cited by 64 publications

(35 citation statements)

References 59 publications

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“…24 Moreover, the magnetism supported CoPt@Co(OH) 2 arrays showed the improved stability and better hydrogen evolution reaction (HER) characteristics as a result of the intrinsic magnetic property of the catalyst for over all water splitting. 25 All of the above studied metal oxides show good magnetic properties along with good photocatlytic water splitting activity. Hence, we perform a comparative study of the pristine GO and rGOs that reduced by ascorbic acid (rGO-AA) and lemon (rGO-lemon) with respect to their magnetic properties and hydrogen generation to establish the relationship between magnetism and water splitting.…”

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confidence: 96%

Biogenic Reduction of Graphene Oxide: An Efficient Superparamagnetic Material for Photocatalytic Hydrogen Production

Gurbani

Han

Marumoto

et al. 2018

ACS Appl. Energy Mater.

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Here, we present the reduction of the graphene oxide (GO) sheets by means of the two reducing agents, i.e., ascorbic acid and lemon juice. As-prepared carbonaceous substances (rGO-AA and rGO-Lemon) exhibits good room temperature (RT) ferromagnetism even in absence of dand f-electrons as well as they show good hydrogen generation capacity via photocatalytic water splitting. The amount of H 2 evolved for Pt/GO, Pt/ rGO-AA, and Pt/rGO-Lemon systems was 32.0790, 23.1649, and 38.0790 mmol h −1 g −1 , respectively. The results go hand in hand and are supported by the reasonably good spin concentration due to the presence of a large amount of the free-radical-like carbon, long-range direct/indirect exchange or interaction between graphene matrix, fragmented graphitic zones, C-defect nonbonding localized electronic states, and flat-band quasi-localized (QL) states induced by the point defects.

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confidence: 96%

Biogenic Reduction of Graphene Oxide: An Efficient Superparamagnetic Material for Photocatalytic Hydrogen Production

Gurbani

Han

Marumoto

et al. 2018

ACS Appl. Energy Mater.

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“…Its corundum-type crystalline structure belongs to the D 3d 6 group for which seven Raman-active modes (2 A 1g + 5E g ) and six IR-active modes (4E u + 2 A 2u ) are expected from symmetry considerations. [50] Namely, the peaks in the lower wavenumber region of the Raman spectra at 224, 242, 290, 406, 487, 606 cm À 1 correspond to A 1g ( 1), E g (1), unresolved [51] E g ( 2) + E g (3), E g (4), A 1g (2), and E g (5) Raman modes, [52] respectively. Besides these peaks', other spectral features in the higher wavenumber region can be seen: peaks at 655 and 808 cm À 1 and a series of bands in the range 950-1700 cm À 1 with the most prominent peak centred at 1310 cm À 1 .…”

Section: Resultsmentioning

confidence: 99%

Promising Electrocatalytic Water and Methanol Oxidation Reaction Activity by Nickel Doped Hematite/Surface Oxidized Carbon Nanotubes Composite Structures

et al. 2022

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Tailoring the precise construction of non-precious metals and carbon-based heterogeneous catalysts for electrochemical oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) is crucial for energy conversion applications. Herein, this work reports the composite of Ni doped Fe 2 O 3 (NiÀ Fe 2 O 3 ) with mildly oxidized multi-walled CNT (OÀ CNT) as an outstanding Mott-Schottky catalyst for OER and MOR. OÀ CNT acts as a cocatalyst which effectively regulates the charge transfer in NiÀ Fe 2 O 3 and thus enhances the electrocatalytic performance.NiÀ Fe 2 O 3 /OÀ CNT exhibits a low onset potential of 260 mV and overpotential 310 mV @ 10 mA cm À 2 for oxygen evolution. Being a Mott-Schottky catalyst, it achieves the higher flat band potential of À 1.15 V with the carrier density of 0.173 × 10 24 cm À 3 . Further, in presence of 1 M CH 3 OH, it delivers the MOR current density of 10 mA cm À 2 at 1.46 V vs. RHE. The excellent electrocatalytic OER and MOR activity of NiÀ Fe 2 O 3 / OÀ CNT could be attributed to the synergistic interaction between Ni-doped Fe 2 O 3 and OÀ CNT.

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“…At present, tremendous strategies have been applied for enhancing the stability of catalysts or electrodes for HER and OER, but for TM(OH)x, which exhibited its typical characteristics [149,158,162,177,187,[191][192][193][194]. For instance, Malik et al [191] found that the stability of CoPt@Co(OH)2 array can be improved by magnetic field. As a result, the HER LSVs supported by an external magnet showed slight increase in overpotential of 4 mV at a current density of 50 mA cm -2 on the 1st and 5th day of aging.…”

Section: Stabilitymentioning

confidence: 99%

Layered transition-metal hydroxides for alkaline hydrogen evolution reaction

Liu

Wang

Sun

2020

Chinese Journal of Catalysis

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Hydrogen is a promising sustainable energy to replace fossil fuels owning to its high specific energy and environmental friendliness. Alkaline water electrolysis has been considered as one of the most prospective technologies for large scale hydrogen production. To boost the sluggish kinetics of hydrogen evolution reaction (HER) in alkaline media, abundant materials have been designed and fabricated. Herein, we summarize the key achievements in the development of layered transition-metal hydroxides [TM(OH)x] for efficient alkaline HER. Based on the structure of TM(OH)x, the mechanism of synergistic effect between TM(OH)x and HER active materials is illuminated firstly. Then, recent progress of TM(OH)x-based HER catalysts to optimize the synergistic effect are categorized as TM(OH)x and active materials, including species, structure, morphology and interaction relationship. Furthermore, TM(OH)x-based overall water splitting electrocatalysts and electrodes are summarized in the design principles for high activity and stability. Finally, some of key challenges for further developments and applications of hydrogen production are proposed.

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Magnetic CoPt nanoparticle-decorated ultrathin Co(OH)₂ nanosheets: an efficient bi-functional water splitting catalyst

Abstract: Magnetic CoPt bimetallic NPs anchored on ultrathin Co(OH)2 nanosheet arrays functioned as an efficient bi-functional water splitting catalyst where the intrinsic magnetism of CoPt was used to improve the stability further by providing external magnetic support.

Cited by 64 publications

References 59 publications

Biogenic Reduction of Graphene Oxide: An Efficient Superparamagnetic Material for Photocatalytic Hydrogen Production

Biogenic Reduction of Graphene Oxide: An Efficient Superparamagnetic Material for Photocatalytic Hydrogen Production

Promising Electrocatalytic Water and Methanol Oxidation Reaction Activity by Nickel Doped Hematite/Surface Oxidized Carbon Nanotubes Composite Structures

Layered transition-metal hydroxides for alkaline hydrogen evolution reaction

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Magnetic CoPt nanoparticle-decorated ultrathin Co(OH)2 nanosheets: an efficient bi-functional water splitting catalyst

Abstract: Magnetic CoPt bimetallic NPs anchored on ultrathin Co(OH)2 nanosheet arrays functioned as an efficient bi-functional water splitting catalyst where the intrinsic magnetism of CoPt was used to improve the stability further by providing external magnetic support.

Cited by 64 publications

References 59 publications

Biogenic Reduction of Graphene Oxide: An Efficient Superparamagnetic Material for Photocatalytic Hydrogen Production

Biogenic Reduction of Graphene Oxide: An Efficient Superparamagnetic Material for Photocatalytic Hydrogen Production

Promising Electrocatalytic Water and Methanol Oxidation Reaction Activity by Nickel Doped Hematite/Surface Oxidized Carbon Nanotubes Composite Structures

Layered transition-metal hydroxides for alkaline hydrogen evolution reaction

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Magnetic CoPt nanoparticle-decorated ultrathin Co(OH)₂ nanosheets: an efficient bi-functional water splitting catalyst