Nickel substituted oxygen deficient nanoporous lithium ferrite based green energy device hydroelectric cell

Saini, Sandeep; Shah, Jyoti; Kotnala, R.K.; Yadav, K. L.

doi:10.1016/j.jallcom.2020.154334

Cited by 55 publications

(29 citation statements)

References 45 publications

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“…These peak at lower binding energy (526.9 eV) implies the presence of lattice oxygen species, whereas the higher binding energy peaks at 529 and 531.3 eV correspond to oxygen vacancy and chemisorbed oxygen components, respectively. However, in SKB, two binding energy peaks at 529.6 and 531.7 eV are observed corresponding to oxygen vacancies and chemisorbed oxygen species . The lattice oxygen peak disappears in the sintered composite SKB, but the height of oxygen vacancy peak increases as compared to UKB.…”

Section: Resultsmentioning

confidence: 94%

“…However, in SKB, two binding energy peaks at 529.6 and 531.7 eV are observed corresponding to oxygen vacancies and chemisorbed oxygen species. 46 The lattice oxygen peak disappears in the sintered composite SKB, but the height of oxygen vacancy peak increases as compared to UKB. This might be due to the formation of more number of oxygen vacancies.…”

Section: = −mentioning

confidence: 91%

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Bandgap Engineering in a Staggered-Type Oxide Perovskite Heterojunction for Efficient Visible Light-Driven Photocatalytic Dye Degradation

2021

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Oxide perovskite materials with ABO3 structure have been widely employed for photocatalytic applications. However, owing to the disadvantageous electron–hole recombination process and wide bandgap of some materials, the photocatalytic performance is seemingly restricted. Coupling two catalysts together through the formation of a heterojunction ensures effective charge carrier separation. The intimate interaction between the materials is propitiously useful for charge transfer, thereby increasing the efficacy. In this study, the photocatalytic activity of a K x Na(1‑x)NbO3–BaBiO3 (KNN-BBO) heterojunction material for the degradation of Rhodamine 6G organic dye was investigated. The materials were extensively characterized by X-ray diffraction, UV–Vis diffused reflectance spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and N2 adsorption isotherms. The degradation efficiency of the organic contaminant under 1 sun simulated sunlight is monitored by spectral analysis from UV–Vis absorption spectroscopy. The resistance to charge transfer was also observed by electrochemical impedance spectroscopy. The effect of the sintering temperature on the photoinduced degradation activity was also included in our study. An unsintered KNN-BBO (UKB) composite material is found to be the most efficient catalyst with 84% removal efficiency as compared to the sintered one (SKB). This is attributed to the reduced bandgap with staggered-type band alignment, increased surface area, and surface oxygen vacancy states. Together with the crucial findings of this work, a probable mechanism for enhanced photocatalytic activity has been proposed here.

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Section: Resultsmentioning

confidence: 94%

Section: = −mentioning

confidence: 91%

Bandgap Engineering in a Staggered-Type Oxide Perovskite Heterojunction for Efficient Visible Light-Driven Photocatalytic Dye Degradation

2021

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“…The device adsorbs and spontaneously chemi-dissociates water molecules on defective material surfaces into H + and OH – ions at room temperature. Nanopores in the cell material act as trapping centers for hopping protons, which generate a high electric potential inside the nanopore and sustained splitting of physisorbed water molecules. ,− It has been observed that surface defect states, such as oxygen vacancies, interstitials, and unsaturated surface bonds, enhance active sites for water molecule attraction and the chemi-dissociation reaction. , Doping of metal ions has been found to be very effective to enhance the defect concentration, which improved the current generation by SnO 2 -based HEC . Antimony (Sb) doping has been reported to largely increase the surface area and defect concentration in SnO 2 nanoparticles. − It occupies Sn 4+ sites in the rutile structure of SnO 2 , and surface enrichment of Sb 5+ ions has been found to be responsible for increased surface conductivity .…”

Section: Introductionmentioning

confidence: 99%

Highly Accelerated, Sustainable, Abundant Water Splitting at Room Temperature Generating Green Electricity by Sb-Doped SnO₂ Hydroelectric Cell

Shukla

Shah

2021

ACS Sustainable Chem. Eng.

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Hydroelectric cell (HEC), a revolutionary invention, has created a new exclusive domain in green energy generation by defect-assisted water splitting/dissociation on metal oxides. In the present work, doping of metallic antimony (Sb) in tin oxide (SnO 2 ) abundantly produced oxygen vacancies. It significantly increased the active centers for adsorption and dissociation of water that ultimately led to highly accelerated water splitting to generate a record high current in a Sb−SnO 2based HEC. The photoluminescence (PL) emission peak at 656 nm confirms the electronic transitions to defect levels generated by tin (Sn) interstitials. Raman spectroscopy showed enhanced inplane oxygen vacancies with the presence of the prominent broadening of the 571 cm −1 mode. The X-ray photoemission spectroscopy (XPS) results suggest that a large amount of antimony is segregated on the surface and grain boundaries in the 3+ oxidation state. A large number of defect pair Sb 3+ −V o ** centers accompanied by a highly reduced surface due to Sb led to 4-fold current production by the HEC based on Sb−SnO 2 compared to SnO 2 . The g values calculated from electron paramagnetic resonance (EPR) spectroscopy for SnO 2 and Sb−SnO 2 as 2.12 and 2.15, respectively, confirmed oxygen vacancies. The Sb−SnO 2based HEC recorded a remarkable short circuit current density, I sc ∼ 23.2 mA/cm 2 , and peak output power, P out ∼ 32.2 mW/cm 2 . Antimony doping decreases the bulk resistance of the cell by 45 times due to highly accelerated OH − and H 3 O + conduction in Sb− SnO 2 HEC as observed by Nyquist plots. The defects-decorated Sb−SnO 2 -based HEC possesses an ultimate capability to replace solar cells and fuel cells.

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“…One of the past work shows the effect of cobalt doping on Lithium ferrite, where the dopants tailored the magnetic and dielectric properties of lithium ferrite nanoparticles (Rasheed 2015). Nickel substituted nanoporous lithium ferrite nanoparticles were recently used in the generation of green energy (Saini et al 2020). It has inclined our research towards this direction as this material has found intense application in electronics, magnetism, hyperthermia and drug delivery (Yazdanpanah et al 2020;Ni et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Physical properties of Pr-substituted Li/Ni ferrite magnetic materials at nanometric scale for its multifunctional applications in industries/environment and their cytotoxicity, lymphocyte studies as nanomedicine

et al. 2021

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The rare earth element praseodymium (Pr)-substituted Li/Ni ferrite nanomaterial, Li 0.5 Ni 0.5 Pr x Fe 2−x O 4 (x = 0, 0.01, 0.02, 0.03) has been prepared using cost-effective citrate precursor method. The ferrite magnetic materials are iron-oxide-based materials and at nanometric scale very promising for its multifunctional applications in electronics industries, purification of water and as nanomedicine. In this present research, structural, surface morphology, optical, electronic, and magnetic properties together with cytotoxicity and lymphoproliferation on murine spleen cells have been studied. The X-ray diffraction measurement reveals the formation of pure cubic spinel structure having space group Fd3m. The lattice parameter shows a slight decrement. Furthermore, crystallite size and lattice strain were calculated using W-H plot and show the decrement from 37 to 21 nm with substitution of praseodymium ion. Surface morphology and nanometric scale particle size measurements were carried away using SEM and HRTEM analysis for lattice plane and d-spacing. The bond length was found to increase, while the force constant was found to decrease by the increment of Pr atom. The indirect band gap energies were improved with the substitution of rare-earth ion. The saturation magnetization value was found between 33.5 and 6.73 emu/g for Li 0.5 Ni 0.5 Pr x Fe 2−x O 4 ferrites. The coercivity was estimated in between 185.24 and 98.78Oe for Li-Ni-nanoferrite system. In addition, the observed in vitro cytotoxicity and lymphoproliferative results appeared to be biocompatible and concentrations dependent, as studied by MTT and BrdU assays. The present research results indicate that rare earth element Pr-substituted ferrite magnetic nanomaterial may be applied in transformer cores because of reduced coercivity in opto-electronic instruments owing to improved optical properties and as iron-oxide-based nanomaterials for its uses in health and medical science sector.

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Nickel substituted oxygen deficient nanoporous lithium ferrite based green energy device hydroelectric cell

Cited by 55 publications

References 45 publications

Bandgap Engineering in a Staggered-Type Oxide Perovskite Heterojunction for Efficient Visible Light-Driven Photocatalytic Dye Degradation

Bandgap Engineering in a Staggered-Type Oxide Perovskite Heterojunction for Efficient Visible Light-Driven Photocatalytic Dye Degradation

Highly Accelerated, Sustainable, Abundant Water Splitting at Room Temperature Generating Green Electricity by Sb-Doped SnO₂ Hydroelectric Cell

Physical properties of Pr-substituted Li/Ni ferrite magnetic materials at nanometric scale for its multifunctional applications in industries/environment and their cytotoxicity, lymphocyte studies as nanomedicine

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Nickel substituted oxygen deficient nanoporous lithium ferrite based green energy device hydroelectric cell

Cited by 55 publications

References 45 publications

Bandgap Engineering in a Staggered-Type Oxide Perovskite Heterojunction for Efficient Visible Light-Driven Photocatalytic Dye Degradation

Bandgap Engineering in a Staggered-Type Oxide Perovskite Heterojunction for Efficient Visible Light-Driven Photocatalytic Dye Degradation

Highly Accelerated, Sustainable, Abundant Water Splitting at Room Temperature Generating Green Electricity by Sb-Doped SnO2 Hydroelectric Cell

Physical properties of Pr-substituted Li/Ni ferrite magnetic materials at nanometric scale for its multifunctional applications in industries/environment and their cytotoxicity, lymphocyte studies as nanomedicine

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Highly Accelerated, Sustainable, Abundant Water Splitting at Room Temperature Generating Green Electricity by Sb-Doped SnO₂ Hydroelectric Cell