Realization of Electrochemically Grown a-Fe2O3 Thin Films for Photoelectrochemical Water Splitting Application

Rokade, Avinash; Jadhav, Yogesh; Jathar, Sagar B.; Rahane, Swati; Barma, Sunil V.; Rahane, Ganesh; Thawarkar, Sachin; Vairale, Priti; Punde, Ashvini; Shah, Shruti; Rondiya, Sachin R.; Dzade, Nelson Y.; Bidhan, P; Pawar, Jayant; Roy, Anurag; Jadkar, esh R.

doi:10.30919/es8d532

Cited by 16 publications

(19 citation statements)

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“…The absorption spectrum was recorded in the range of 200-800 nm at room temperature. We prepared a The band gap of the prepared nanomaterial was calculated using the Tauc equation (Granqvist, 1995;Gnanasekar et al, 2022;Raj et al, 2022;Rajeswari et al, 2022;Rokade et al, 2022).…”

Section: Optical Measurementsmentioning

confidence: 99%

Solvent-free synthesis of NiCo2S4 having the metallic nature

et al. 2022

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Nickel-cobalt sulfide (NiCo2S4) is a prominent member of bimetallic transition metal sulfides. It is being widely used for a variety of applications such as electrode material, photocatalysis, and energy storage devices (like pseudo capacitors, supercapacitors, solar cells, and fuel cells) due to its better electronic conductivity, manageable morphology, and high capacitance. This work presents the one-step solventless synthesis of NiCo2S4 sheet-like nanostructures and then explores their metallic nature. Scanning electron microscopy (SEM) and transmission electron microscopic (TEM) analysis show the sheet-like grown morphology. Few nanorods are also seen. Except for a recent study (Xia et al. 2015) that shows metallic behavior, most of the reports show that NiCo2S4 is a semiconductor with claimed bandgap between 1.21 and 2.4 eV. In this study, we observe from UV-Vis and diffuse reflectance spectroscopy (DRS) that NiCo2S4 has a specific band gap value between 2.02 and 2.17 eV. However, IV characteristics in the temperature range of 300–400 K show that NiCo2S4 is a metal with a positive temperature coefficient of resistance consistent with a recent report. Furthermore, we see the ohmic conduction mechanism. The Arrhenius plot is drawn, and the activation energy is calculated to be 3.45 meV. The metallic nature is attributed to the coupling of two metal species (nickel and cobalt), which accounts for its superior conductivity and performance in a variety of essential applications.

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Section: Optical Measurementsmentioning

confidence: 99%

Solvent-free synthesis of NiCo2S4 having the metallic nature

et al. 2022

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“…[1,2] This presented room for investigations on the PEC water-splitting potential of semiconductors with smaller bandgaps, which are equally stable in aqueous environments. Many stable semiconductors with smaller bandgaps compared to TiO 2 , stable in aqueous media, and with smaller bandgaps that enhance visible light absorption like tungsten oxide (WO 3 ), [1] bismuth vanadate (BiVO 4 ), [1,3] and hematite, [4,5] have since been studied for PEC water splitting. Hematite has been extensively investigated due to its earth-abundance, small bandgap of %1.8-2.2 eV, [6] favorable valence band edge position for water oxidation, and stability in a wide pH range.…”

Section: Introductionmentioning

confidence: 99%

Erbium and Titanium Co‐Doped Hematite Nanorods: Structural, Optical, and Catalytic Properties for Enhanced Water Splitting

Talibawo

Kyesmen

Cyulinyana

et al. 2023

Physica Status Solidi (a)

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Herein, hydrothermally synthesized hematite nanorods (NRs) co‐doped with erbium and titanium, using titanium tetrachloride and erbium(III) nitrate pentahydrate as the dopant sources, are presented. The effect of varied volumes of the erbium/titanium surface co‐dopants on the morphology, structural, optical, and photoelectrochemical (PEC) properties of hematite NRs is investigated. The pristine hematite, 40 μL‐Er, and 40 μL‐Er/20 μL‐Ti‐doped NRs samples present a similar surface morphology of vertically aligned NRs. The NRs are randomly oriented with an increase in titanium dopant for the 40 μL‐Er/30 μL‐Ti‐doped NRs and later coalesced for the 40 μL‐Er/40 μL‐Ti‐doped NRs. The structural analysis based on X‐ray diffraction and Raman analysis present a uniform, pure hematite phase for all the prepared NRs. The samples exhibit high photon absorbance with peaks in the 400–450 nm wavelength range of the visible spectrum. The 40 μL‐Er/40 μL‐Ti‐doped NRs sample present the highest photocurrent density of 83.9 μA cm−2 at 1.4 V vs reversible hydrogen electrode (RHE) and is attributed to the lowest flat band potential (−0.76 V vs RHE) that enhances charge mobility at the electrode–electrolyte interface. These results reveal the facile erbium/titanium doping of hematite NRs as a viable strategy for enhancing their PEC water‐splitting performance.

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“…4−6 Among the many hydrogen production technologies, photoelectrocatalytic (PEC) hydrogen production using semiconductors as photoelectrodes to absorb solar energy and promote water splitting offers an attractive new way to solve energy problems. 7−10 In recent years, a large number of semiconductor materials, such as TiO 2, 11,12 WO 3, 13,14 Fe 2 O 3, 15 BiVO 4, 16,17 and so on, have been applied to hydrogen water splitting operations in the field of PEC to achieve efficient hydrogen production efficiency. Nevertheless, the future applicability of PEC in water splitting has still been hampered by issues related to the high recombination rate of photogenerated charge 18,19 and the narrow light response range 20 of the photoelectric electrodes.…”

Section: Introductionmentioning

confidence: 99%

Lattice Fluorine and Adsorbed Fluorine Combine with Piezoelectric Polarization to Boost the Separation of Bulk and Surface Carriers of Bi₂WO₆ for Achieving Efficient Piezo-PEC Performance

You

Wang

Guo

et al. 2023

ACS Appl. Energy Mater.

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The lower polarization intensity and charge separation efficiency are the main factors hindering the wide application of piezoelectric photoelectrocatalytic (piezo-PEC) water splitting. Here, we first introduced lattice fluorine into the bulk Bi 2 WO 6 by fluorination treatment to improve the piezoelectric polarization intensity of Bi 2 WO 6 . In addition, the adsorbed fluorine produced by the fluorination treatment can promote the effective separation of the surface photogenerated charges, thus achieving the effective transfer and separation of the bulk and surface photogenerated charges, further realizing the efficient piezo-PEC water splitting performance. The photocurrent of Bi 2 WO 6 with lattice fluorine and adsorbed fluorine reaches 0.298 mA/cm 2 under ultrasonication by proper fluorination, which is almost 3.3 times that of pure Bi 2 WO 6 under the same conditions. Detailed experimental data shows that the presence of lattice fluorine and adsorbed fluorine can not only effectively improve the bulk piezoelectric polarization of the photoelectric electrode but also effectively optimize the surface photoinduced charge separation. This study provides a promising approach to improve the performance of piezo-PEC by tuning the polarization intensity and surface state of the piezoelectric material.

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Realization of Electrochemically Grown a-Fe2O3 Thin Films for Photoelectrochemical Water Splitting Application

Cited by 16 publications

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Solvent-free synthesis of NiCo2S4 having the metallic nature

Solvent-free synthesis of NiCo2S4 having the metallic nature

Erbium and Titanium Co‐Doped Hematite Nanorods: Structural, Optical, and Catalytic Properties for Enhanced Water Splitting

Lattice Fluorine and Adsorbed Fluorine Combine with Piezoelectric Polarization to Boost the Separation of Bulk and Surface Carriers of Bi₂WO₆ for Achieving Efficient Piezo-PEC Performance

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Realization of Electrochemically Grown a-Fe2O3 Thin Films for Photoelectrochemical Water Splitting Application

Cited by 16 publications

References 0 publications

Solvent-free synthesis of NiCo2S4 having the metallic nature

Solvent-free synthesis of NiCo2S4 having the metallic nature

Erbium and Titanium Co‐Doped Hematite Nanorods: Structural, Optical, and Catalytic Properties for Enhanced Water Splitting

Lattice Fluorine and Adsorbed Fluorine Combine with Piezoelectric Polarization to Boost the Separation of Bulk and Surface Carriers of Bi2WO6 for Achieving Efficient Piezo-PEC Performance

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Lattice Fluorine and Adsorbed Fluorine Combine with Piezoelectric Polarization to Boost the Separation of Bulk and Surface Carriers of Bi₂WO₆ for Achieving Efficient Piezo-PEC Performance