Magnetically recyclable CoFe<sub>2</sub>O<sub>4</sub>/ZnO nanocatalysts for the efficient catalytic degradation of Acid Blue 113 under ambient conditions

Krishna, S.; Sathishkumar, P.; Pugazhenthiran, N.; Guesh, Kiros; Mangalaraja, Ramalinga Viswanathan; Shanmugam, Kumaran; Gracia-Pinilla, M.A.; Anandan, Sambandam

doi:10.1039/d0ra00082e

Cited by 13 publications

(7 citation statements)

References 31 publications

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“…The diffraction pattern in Figure i taken from spot 2 presents not only single-crystal diffraction spots but also clear diffraction rings, indicating the nanocrystalline nature of the surface after the etching treatment. The marked diffraction rings can be assigned to the formation of the spinel structure, in good agreement with the literature − and our high-resolution TEM (HRTEM) results (see below). Figure j shows a typical HRTEM micrograph of the interface between BSCF and the new nanocrystalline layer.…”

Section: Resultssupporting

confidence: 92%

Proton-Assisted Reconstruction of Perovskite Oxides: Toward Improved Electrocatalytic Activity

Cao

Yan

et al. 2021

ACS Appl. Mater. Interfaces

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Electrocatalysis is indispensable to various emerging energy conversion and storage devices such as fuel cells and water electrolyzers. Owing to their unique physicochemical properties, perovskite oxide materials are one of the most promising water oxidation (OER) catalysts solely comprising earth-abundant elements. Nonetheless, many perovskite oxide catalysts suffer from a number of inherent problems such as the A-site cation segregation on the surface, coarse particles due to agglomeration/sintering, and surface decomposition during catalytic reactions. Besides, the catalytic activity is often incomparable with those of the state-of-the-art catalysts. In this work, we developed a proton-assisted approach to mitigate these common challenges. The protonation via the interaction of oxygen vacancies and water molecules induced the formation of protonic defects and the lattice expansion of the perovskite, leading to the fracture of big particles to yield small nanoparticles. This hydration in an acidic solution also selectively removed the A-site cation segregates and generated a spinel/perovskite heterostructure on the surface. We verified this approach using three typical perovskite OER catalysts including Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF), La0.6Sr0.4Co0.8Fe0.2O3 (LSCF), and La0.75Sr0.25MnO3 (LSM). The processed catalysts showed much improved activity while maintaining their excellent stability, surpassing most of today’s OER catalysts based on complex oxides.

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Section: Resultssupporting

confidence: 92%

Proton-Assisted Reconstruction of Perovskite Oxides: Toward Improved Electrocatalytic Activity

Cao

Yan

et al. 2021

ACS Appl. Mater. Interfaces

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“…The BTMO phases were confirmed from the HRTEM images (Figure a–c). The FeCoCNFs showed lattice fringe distances of 0.255 and 0.206 nm, which are consistent with the interplanar spacings of the (311) and (400) facets, respectively, of Fe 2 CoO 4 (JCPDS: 22-1086) . The lattice fringes with spacing distances of 0.485 and 0.296 nm that were observed in FeNiCNFs were assigned to the (111) and (220) planes, respectively, of Fe 2 NiO 4 (JCPDS: 10-0325) .…”

Section: Resultssupporting

confidence: 74%

“…. 43 The lattice fringes with spacing distances of 0.485 and 0.296 nm that were observed in FeNiCNFs were assigned to the (111) and (220) planes, respectively, of Fe 2 NiO 4 (JCPDS: 10-0325). 44 Lastly, the lattice fringe spacings of CoNiCNFs were observed to be 0.245 and 0.209 nm and were attributed to the (111) and (200) planes, respectively, of CoNiO 2 (JCPDS: 10-0188).…”

Section: Resultsmentioning

confidence: 95%

Carbon Nanofibers Featuring Bimetallic Nanoparticle-in-Pore Structures as Water-Splitting Electrocatalysts

Heo

Noh

et al. 2021

ACS Appl. Nano Mater.

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Research effort has increasingly been devoted to exploiting efficient noble-metal-free electrocatalysts because of their low cost and abundancy. Herein, metallic nanoparticulate-containing carbon nanofibers (MCNFs) featuring interior, nanoparticulate-in-pore structures were fabricated by taking advantage of cationic metal species/anionic surfactant complexes (MSCs). Binary MSC mixtures containing Fe−Co, Fe−Ni, and Co−Ni species were used to control not only the size/loading amount of the metallic phases but also the microstructural characteristics of the nanofiber matrices. Compared to their single MSC counterparts, the binary MSC mixtures allowed the generation of unique metallic phases, such as binary transitionmetal oxides, and resulted in enhanced surface area/porosity and reduced charge transfer resistance. The noble-metal-free MCNFs were demonstrated as electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The MCNFs prepared using binary combinations of Fe−Ni and Co−Ni, viz., FeNiCNFs and CoNiCNFs, showed outstanding performances for the OER and HER, respectively. For the OER particularly, at potentials exceeding 1.6 V (vs RHE), the FeNiCNFs showed higher current densities than that of the well-known, conventionally used electrocatalyst RuO 2 . For overall water splitting, an asymmetric FeNiCNF∥CoNiCNF cell rendered performance stability that was 15% better than that of the RuO 2 ∥Pt/C control cell. Based on the results of this study, various combinations of MSCs with controlled loading into functional matrices can be prepared to yield efficient, cost-effective electrocatalysts for water splitting.

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“…However, preparing such a heterostructure material in nanoscale is still challenging because of the structural complexity and difficulties in controlling the crystal growth of the materials. In addition, despite increasing the surface area and enhancing the photocatalytic activity, the nanostructured photocatalysts may create a secondary pollution problem due to the difficulty in separation after use [ 19 , 27 ]. Moreover, the agglomeration of nano-sized particles is another issue in the widespread application of photocatalyst in wastewater treatment [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of ZnO-TiO2/Carbon Fiber Composite with Enhanced Photocatalytic Properties

Pant

Ojha

Kuk³

et al. 2020

Nanomaterials

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Herein, we prepared a novel photocatalytic ZnO-TiO2 loaded carbon nanofibers composites (ZnO-TiO2-CNFs) via electrospinning technique followed by a hydrothermal process. At first, the electrospun TiO2 NP-embedded carbon nanofibers (TiO2-CNFs) were achieved using electrospinning and a carbonization process. Next, the ZnO particles were grown into the TiO2-CNFs via hydrothermal treatment. The morphology, structure, and chemical compositions were studied using state-of-the-art techniques. The photocatalytic performance of the ZnO-TiO2-CNFs composite was studied using degrading methylene blue (MB) under UV-light irradiation for three successive cycles. It was noticed that the ZnO-TiO2-CNFs nanocomposite showed better MB removal properties than that of other formulations, which might be due to the synergistic effects of carbon nanofibers and utilized metal oxides (ZnO and TiO2). The adsorption characteristic of carbon fibers and matched band potentials of ZnO and TiO2 combinedly help to boost the overall photocatalytic performance of the ZnO-TiO2-CNFs composite. The obtained results from this study indicated that it can be an economical and environmentally friendly photocatalyst.

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Magnetically recyclable CoFe₂O₄/ZnO nanocatalysts for the efficient catalytic degradation of Acid Blue 113 under ambient conditions

Abstract: CoFe2O4/ZnO magnetic nanocatalysts were synthesized using a low-frequency ultrasound-assisted technique to enhance the optical, morphological, magnetic and catalytic properties of ZnO.

Cited by 13 publications

References 31 publications

Proton-Assisted Reconstruction of Perovskite Oxides: Toward Improved Electrocatalytic Activity

Proton-Assisted Reconstruction of Perovskite Oxides: Toward Improved Electrocatalytic Activity

Carbon Nanofibers Featuring Bimetallic Nanoparticle-in-Pore Structures as Water-Splitting Electrocatalysts

Synthesis and Characterization of ZnO-TiO2/Carbon Fiber Composite with Enhanced Photocatalytic Properties

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Magnetically recyclable CoFe2O4/ZnO nanocatalysts for the efficient catalytic degradation of Acid Blue 113 under ambient conditions

Abstract: CoFe2O4/ZnO magnetic nanocatalysts were synthesized using a low-frequency ultrasound-assisted technique to enhance the optical, morphological, magnetic and catalytic properties of ZnO.

Cited by 13 publications

References 31 publications

Proton-Assisted Reconstruction of Perovskite Oxides: Toward Improved Electrocatalytic Activity

Proton-Assisted Reconstruction of Perovskite Oxides: Toward Improved Electrocatalytic Activity

Carbon Nanofibers Featuring Bimetallic Nanoparticle-in-Pore Structures as Water-Splitting Electrocatalysts

Synthesis and Characterization of ZnO-TiO2/Carbon Fiber Composite with Enhanced Photocatalytic Properties

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Magnetically recyclable CoFe₂O₄/ZnO nanocatalysts for the efficient catalytic degradation of Acid Blue 113 under ambient conditions