Electrodeposited p-type Co<sub>3</sub>O<sub>4</sub> with high photoelectrochemical performance in aqueous medium

Ebadi, Mehdi; Mat-Teridi, M. A.; Sulaiman, Muhammad Azwadi; Basirun, Wan Jeffrey; Ludin, Norasikin Ahmad; Ibrahim, Mohamed F.; Sopian, Kamaruzzaman

doi:10.1039/c5ra04008f

Cited by 27 publications

(16 citation statements)

References 34 publications

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“…It therefore may be applied as a protective heterojunction layer to overcome the typical overpotential in photoactive materials. Examples of materials used in such applications include Cu x O [ 19 , 29 ], CdS [ 30 ], TiO 2 [ 31 ], Fe 2 O 3 [ 32 ], and BiVO 4 [ 33 – 34 ]. To absorb light with Co 3 O 4 , an adequately thick film is required.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, relatively thin Co 3 O 4 samples can overcome charge collection problems due to its semitransparency, which has been investigated in this study. To fabricate Co 3 O 4 samples, Kirkendall diffusion is effective to induce the thermal oxidation of Co under atmospheric conditions, which provides an enhanced surface area due to porous features [ 19 , 32 – 38 ].…”

Section: Introductionmentioning

confidence: 99%

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Thickness-dependent photoelectrochemical properties of a semitransparent Co₃O₄ photocathode

Patel

Kim

2018

Beilstein J. Nanotechnol.

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Co3O4 has been widely studied as a catalyst when coupled with a photoactive material during hydrogen production using water splitting. Here, we demonstrate a photoactive spinel Co3O4 electrode grown by the Kirkendall diffusion thermal oxidation of Co nanoparticles. The thickness-dependent structural, physical, optical, and electrical properties of Co3O4 samples are comprehensively studied. Our analysis shows that two bandgaps of 1.5 eV and 2.1 eV coexist with p-type conductivity in porous and semitransparent Co3O4 samples, which exhibit light-induced photocurrent in photoelectrochemical cells (PEC) containing the alkaline electrolyte. The thickness-dependent properties of Co3O4 related to its use as a working electrode in PEC cells are extensively studied and show potential for the application in water oxidation and reduction processes. To demonstrate the stability, an alkaline cell was composed for the water splitting system by using two Co3O4 photoelectrodes. The oxygen gas generation rate was obtained to be 7.17 mL·h−1 cm−1. Meanwhile, hydrogen gas generation rate was almost twice of 14.35 mL·h−1·cm−1 indicating the stoichiometric ratio of 1:2. We propose that a semitransparent Co3O4 photoactive electrode is a prospective candidate for use in PEC cells via heterojunctions for hydrogen generation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thickness-dependent photoelectrochemical properties of a semitransparent Co₃O₄ photocathode

Patel

Kim

2018

Beilstein J. Nanotechnol.

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“…Although p ‐type Co 3 O 4 has been mainly used as a electrochemical catalyst for OER, there are a few reports used Co 3 O 4 as photocathodes for hydrogen evolution . Mao et al reported the growth of mesoporous Co 3 O 4 nanosheet through an in situ topotactic transformation from solid hexagonal Co(OH) 2 to porous spinel Co 3 O 4 .…”

Section: Metal Oxide Photocathodes For Water Reductionmentioning

confidence: 99%

“…The mesoporous Co 3 O 4 nanosheet achieved a photocurrent density of 33.6 µA cm −2 in 0.5 M Na 2 S solution under visible light irradiation. [84b] Later, Ebadi et al further demonstrated the synthesis of Co 3 O 4 /CuO heterostructures by electrochemical deposition method and its implementation as photocathodes for solar hydrogen generation. [84a] The composite photocathode showed a pronounced photocurrent of 6.6 mA cm −2 at −0.3 V vs Ag/AgCl.…”

Section: Metal Oxide Photocathodes For Water Reductionmentioning

confidence: 99%

“…[84b] Later, Ebadi et al further demonstrated the synthesis of Co 3 O 4 /CuO heterostructures by electrochemical deposition method and its implementation as photocathodes for solar hydrogen generation. [84a] The composite photocathode showed a pronounced photocurrent of 6.6 mA cm −2 at −0.3 V vs Ag/AgCl. On the other hand, the long‐term stability is still a critical problem for the practical application of Co 3 O 4 based photocathodes.…”

Section: Metal Oxide Photocathodes For Water Reductionmentioning

confidence: 99%

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Progress in Developing Metal Oxide Nanomaterials for Photoelectrochemical Water Splitting

Yang

Niu

Han

et al. 2017

Advanced Energy Materials

554

312

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Photoelectrochemical (PEC) water splitting represents an environmentally friendly and sustainable method to obtain hydrogen fuel. Semiconductor materials as the central components in PEC water splitting cells have decisive influences on the device's solar‐to‐hydrogen conversion efficiency. Among semiconductors, metal oxides have received a lot of attention due to their outstanding (photo)‐electrochemical stability, low cost, favorable band edge positions and wide distribution of bandgaps. In the past decades, significant processes have been made in developing metal oxide nanomaterials for PEC water splitting. In this review, the recent progress using metal oxides as photoelectrodes and co‐catalysts for PEC water splitting is summarized. Their performance, limitations and potentials are also discussed. Last, the key challenges and opportunities in the development and implementation of metal oxide nanomaterials for PEC water splitting are discussed.

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Surface-dependent properties of α-Ag2WO4: a joint experimental and theoretical investigation

et al. 2020

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α-Ag 2 WO 4 has attracted much attention in recent years due to its unique crystal and electronic structures, which are suitable for a wide range of applications. This work presents a more realistic study, based on first-principles calculations and experimental results, of the potential of α-Ag 2 WO 4 for antibacterial and photocatalytic activity. α-Ag 2 WO 4 material has been successfully synthesized by a coprecipitation method and subjected to microwave irradiation for different times. The as-synthesized microcrystals were structurally characterized by X-ray diffraction, while the morphological aspects were investigated by field emission scanning electron microscopy. The experimental studies and theoretical simulations of α-Ag 2 WO 4 , based on density functional theory calculations, have highlighted several key parameters (surface-dependent) that determine the antibacterial (against Staphylococcus aureus ) and photocatalytic activity (for the degradation of Rhodamine B), and provided some general principles for materials design. We believe that our results offer new insights regarding the local coordination of superficial Ag and W cations (i.e. clusters) on each exposed surface of the corresponding morphology, that dictate the antibacterial and photocatalytic activities of α-Ag 2 WO 4 , a field that has so far remained unexplored. Response to Reviewers:Manuscript ID: TCAC-D-20-00072 Response to reviewersWe acknowledge the Reviewers for their help in improving our manuscript. As can be seen in the revised text, these comments, remarks and suggestions were considered during our revision. Detailed responses, point-by-point, to the reviewers are summarized below and the changes were made along the revised version of the manuscript and were highlighted in red color.

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Electrodeposited p-type Co₃O₄ with high photoelectrochemical performance in aqueous medium

Abstract: Electrofabricated p-Co3O4 based electrodes have shown efficient photoelectrochemical performance at low bias potentials in aqueous medium (∼6.5 mA cm−2vs. SCE at −0.3 V).

Cited by 27 publications

References 34 publications

Thickness-dependent photoelectrochemical properties of a semitransparent Co₃O₄ photocathode

Thickness-dependent photoelectrochemical properties of a semitransparent Co₃O₄ photocathode

Progress in Developing Metal Oxide Nanomaterials for Photoelectrochemical Water Splitting

Surface-dependent properties of α-Ag2WO4: a joint experimental and theoretical investigation

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Electrodeposited p-type Co3O4 with high photoelectrochemical performance in aqueous medium

Abstract: Electrofabricated p-Co3O4 based electrodes have shown efficient photoelectrochemical performance at low bias potentials in aqueous medium (∼6.5 mA cm−2vs. SCE at −0.3 V).

Cited by 27 publications

References 34 publications

Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

Progress in Developing Metal Oxide Nanomaterials for Photoelectrochemical Water Splitting

Surface-dependent properties of α-Ag2WO4: a joint experimental and theoretical investigation

Contact Info

Product

Resources

About

Electrodeposited p-type Co₃O₄ with high photoelectrochemical performance in aqueous medium

Thickness-dependent photoelectrochemical properties of a semitransparent Co₃O₄ photocathode

Thickness-dependent photoelectrochemical properties of a semitransparent Co₃O₄ photocathode