Enhanced photoelectrochemical water splitting performance of hematite photoanodes by hybrid microwave annealing process

Ramachandran, K.; Geerthana, M.; Maadeswaran, P.; Liang, Boxin; Ramesh, R.

doi:10.1016/j.ijleo.2020.164658

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…Furthermore, for the hematite thin films thermally treated at 800 °C, the high temperature seems to be an important factor that affects the charge carrier kinetics and its overall efficiency as photocatalyst. The use of non-conventional thermal processing such as by pulse-laser 12 or hybrid microwave 36 has shown promising results for hematite associated with donor density, crystallinity, optical absorption, and surface defects. A deeper knowledge (i.e.…”

Section: Resultsmentioning

confidence: 99%

On the Effect of Thermal Processing on Sn Diffusion and Efficiency Enhancement in Hematite/FTO Photoanodes

Rodríguez‐Gutiérrez

Mouriño

Freitas

et al. 2022

ECS J. Solid State Sci. Technol.

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The frequently underestimated effects of “in air” thermal treatment processing conditions such as temperature, duration, and heating and cooling rates in the design and efficiency of photoelectrodes fabricated for academic studies onto the most common commercial transparent conductive glass substrate i.e. fluorine-doped tin oxide (FTO) were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, conductive atomic force microscopy, electrochemical impedance spectroscopy, and direct current and photoelectrochemical (PEC) measurements. The PEC response of Hematite photoanode thin films consisting of short nanorods thermally treated at 400 and 800°C upon fast or extended time conditions is inhibited by factors such as crystallinity, Sn diffusion, or substrate integrity. A “fast” thermal treatment in air at 750°C provided the best synergy between charge transfer resistance, Sn-diffusion from the FTO substrate, nanorod dimensions, reduced recombination, improved charge separation and minimized substrate damage. This study offers valuable fundamental and practical insights for a better understanding of the benefits and drawbacks of photoelectrode thermal processing, which is critical for the improvement of the PEC performance-reproducibility relationship for FTO-based solar water splitting systems and devices.

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Section: Resultsmentioning

confidence: 99%

On the Effect of Thermal Processing on Sn Diffusion and Efficiency Enhancement in Hematite/FTO Photoanodes

Rodríguez‐Gutiérrez

Mouriño

Freitas

et al. 2022

ECS J. Solid State Sci. Technol.

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“…The distance between the light source and samples are adjusted to fix the light irradiation as 100 mW cm −2 (1 sun) at the surface of the photocathode. The applied potential (V) vs Ag/AgCl electrode was reported in case of reversible hydrogen electrode (RHE) using the formula[18]…”

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confidence: 99%

Synthesis of 2D-CZTS Nanoplate as Photocathode Material for Efficient PEC Water Splitting

Mahalakshmi¹,

Venugopal²,

Ramachandran

et al. 2021

Preprint

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Fabrication of economically viable photocathode for hydrogen energy production through solar water splitting is a major research among the scientific community for a decade. P-type compound Cu2ZnSnS4 (CZTS) is very interesting material due to its absorption property, earth-abundant constituents and environmental friendliness that serves as a suitable candidate to act as a photocathode. In the present work, Cu2ZnSnS4 (CZTS) nanoparticles are synthesized by simple one-step chemical method and annealed at 350 °C for three different times (60 minutes, 90 minutes and 120 minutes). The effect of annealing time on the structural, optical and photoelectrochemical properties are investigated. XRD pattern indicates the formation of tetragonal crystal structure and the crystallinity increases according to the annealing time. 2-D nanoplate morphology is obtained for the sample that was annealed for 120 minutes. From the absorption spectra, it was found that the band gap decreases with increase of annealing time. Further, the prepared nanoparticle thin films are used as a cathode for photoelectrochemical water splitting application. Among these, the nanoparticles that are annealed for 120 minutes showed higher photocurrent density when compared to nanoparticles annealed for 60 minutes and 90 minutes.

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α-Fe2O3/AmTiO2 heterojunction-based photoanode with improved interfacial charge transport properties for enhanced photoelectrochemical water splitting

Ramachandran

Geerthana

Maadeswaran

et al. 2021

J Mater Sci: Mater Electron

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Enhanced photoelectrochemical water splitting performance of hematite photoanodes by hybrid microwave annealing process

Cited by 7 publications

References 11 publications

On the Effect of Thermal Processing on Sn Diffusion and Efficiency Enhancement in Hematite/FTO Photoanodes

On the Effect of Thermal Processing on Sn Diffusion and Efficiency Enhancement in Hematite/FTO Photoanodes

Synthesis of 2D-CZTS Nanoplate as Photocathode Material for Efficient PEC Water Splitting

α-Fe2O3/AmTiO2 heterojunction-based photoanode with improved interfacial charge transport properties for enhanced photoelectrochemical water splitting

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