Plasmonic nickel nanoparticles decorated on to LaFeO3 photocathode for enhanced solar hydrogen generation

Pawar, Govinder Singh; Elikkottil, Ameen; Pesala, Bala; Tahir, Asif Ali; Mallick, Tapas K.

doi:10.1016/j.ijhydene.2018.10.240

Cited by 38 publications

(17 citation statements)

References 35 publications

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“…The presence of Ni mainly induces for LaFeO 3 photocatalysts an enhancement in the light absorptions in the UV-Vis region below 600 nm, that follows the Ni content [44]. It should point out that nickel nanoparticles don't exhibit relevant surface plasmon resonances because the polarizability of Ni (it possesses fewer free electrons) is weak than noble metals such as Au and Ag [53].The data obtained from UV-Vis reflectance spectra were used for evaluating the band-gap energy (Figure 1b). A band gap value of 2.18 eV is achieved for LaFeO 3 photocatalyst while a band gap value of about 2.17 eV was observed for 0.12Ni/LaFeO 3 and 0.25Ni/LaFeO 3 samples.…”

Section: Uv-vis Diffuse Reflectance Spectramentioning

confidence: 99%

LaFeO3 Modified with Ni for Hydrogen Evolution via Photocatalytic Glucose Reforming in Liquid Phase

et al. 2021

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In this work, the optimization of Ni amount on LaFeO3 photocatalyst was studied in the photocatalytic molecular hydrogen production from glucose aqueous solution under UV light irradiation. LaFeO3 was synthesized via solution combustion synthesis and different amount of Ni were dispersed on LaFeO3 surface through deposition method in aqueous solution and using NaBH4 as reducing agent. The prepared samples were characterized with different techniques: Raman spectroscopy, UltraViolet-Visible Diffuse Reflectance Spettroscopy (UV–Vis-DRS), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), X-ray Fluorescence (XRF), Transmission Electron microscopy (TEM), and Scanning Electron microscopy (SEM) analyses. For all the investigated photocatalysts, the presence of Ni on perovskite surface resulted in a better activity compared to pure LaFeO3. In particular, it is possible to identify an optimal amount of Ni for which it is possible to obtain the best hydrogen production. Specifically, the results showed that the optimal Ni amount was equal to nominal 0.12 wt% (0.12Ni/LaFeO3), for which the photocatalytic H2 production was equal to 2574 μmol/L after 4 h of UV irradiation. The influence of different of photocatalyst dosage and initial glucose concentration was also evaluated. The results of the optimization of operating parameters indicated that the highest molecular hydrogen production was achieved on 0.12Ni/LaFeO3 sample with 1.5 g/L of catalyst dosage and 1000 ppm initial glucose concentration. To determine the reactive species that play the most significant role in the photocatalytic hydrogen production, photocatalytic tests in the presence of different radical scavengers were performed. The results showed that •OH radical plays a significant role in the photocatalytic conversion of glucose in H2. Moreover, photocatalytic tests carried out with D2O instead of H2O evidenced the role of water molecules in the photocatalytic production of molecular hydrogen in glucose aqueous solution.

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Section: Uv-vis Diffuse Reflectance Spectramentioning

confidence: 99%

LaFeO3 Modified with Ni for Hydrogen Evolution via Photocatalytic Glucose Reforming in Liquid Phase

et al. 2021

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“…More interestingly, the reduction of Ni 2+ to Ni 0 can be exclusively carried out by the electron rich amino acid residues like tyrosine, aspartate, glutamate, asparagine and glutamine in BSA as similar to the reduction of gold chloride to metallic Au during the synthesis of BSA capped AuNCs [18] . The absence of an SPR band between 390–540 nm in the UV‐visible spectra (Figure 3a) also confirms the successful formation of nickel nanoclusters [19] …”

Section: Resultsmentioning

confidence: 65%

A Simple and Efficient Turn‐Off Fluorescence Sensor for the Nanomolar Detection of Homovanillic Acid Using Protein Mediated Blue Emitting Nickel Nanoclusters

2021

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Homovanillic acid (HVA) is a catecholamine metabolite that plays a vital role in the diagnosis of several neurological disorders. Thus, a simple and cost‐effective sensing strategy for HVA determination is significant. Herein, we describe the development of a turn‐off fluorescence sensor for the effective determination of HVA using bovine serum albumin stabilized nickel nanoclusters (BSA NiNCs). This biocompatible and water‐suspended fluorophore exhibited strong emission at 405 nm upon exciting at 325 nm. The fluorescence intensity of BSA NiNCs was efficiently quenched by the addition of HVA within the linear range 9.00×10−7 M–5.00×10−8 M with a limit of detection of 9.23×10−9 M. A static quenching mechanism was proposed for the sensor due to the aggregation of BSA NiNCs on adding HVA. The practical utility of the sensor was tested in artificial urine and blood serum and a good recovery using the spike‐recovery method were obtained.

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“…210 nm for synthesis with 10 thousand laser pulses and 260 nm for 40 k. Moreover, a slight absorption band is present at ca 370 nm, which gets more intensive with the number of pulses used and can be assigned to oxidized nickel [ 50 , 51 ]. Interestingly though, literature regarding the absorbance spectra of nickel particles is very inconsistent as some researchers report no absorption bands in the spectrum [ 52 , 53 ], while others claim multiple bands are present [ 54 , 55 , 56 ].…”

Section: Resultsmentioning

confidence: 99%

Laser-Assisted Synthesis and Oxygen Generation of Nickel Nanoparticles

et al. 2020

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Nowadays, more than ever, environmental awareness is being taken into account when it comes to the design of novel materials. Herein, the pathway to the creation of a colloid of spherical, almost purely metallic nickel nanoparticles (NPs) through pulsed laser ablation in ethanol is presented. A complex description of the colloid is provided through UV-vis spectroscopy and dynamic light scattering analysis, ensuring insight into laser-induced nanoparticle homogenization and size-control of the NPs. The transmission electron spectroscopy revealed spherical nanoparticles with a narrow size distribution, whereas the energy-dispersive X-ray spectroscopy accompanied by the X-ray photoelectron spectroscopy revealed their metallic nature. Furthermore, an example of the application of the colloidal nanoparticles is presented, where a quick, five-min ultrasound modification results in over an order of magnitude higher current densities in the titania-based electrode for the oxygen evolution reaction.

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Plasmonic nickel nanoparticles decorated on to LaFeO3 photocathode for enhanced solar hydrogen generation

Cited by 38 publications

References 35 publications

LaFeO3 Modified with Ni for Hydrogen Evolution via Photocatalytic Glucose Reforming in Liquid Phase

LaFeO3 Modified with Ni for Hydrogen Evolution via Photocatalytic Glucose Reforming in Liquid Phase

A Simple and Efficient Turn‐Off Fluorescence Sensor for the Nanomolar Detection of Homovanillic Acid Using Protein Mediated Blue Emitting Nickel Nanoclusters

Laser-Assisted Synthesis and Oxygen Generation of Nickel Nanoparticles

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