Cesium-decorated reduced graphene oxide for photocatalytic hydrogen generation

N. Gnanaseelan; Latha Marasamy; A. Mantilla; S. K. Kamaraj; F. J. Espinosa-Faller; F. Caballero-Briones

doi:10.1016/j.matlet.2022.131864

Cesium-decorated reduced graphene oxide for photocatalytic hydrogen generation

N. Gnanaseelan, Latha Marasamy, A. Mantilla, S. K. Kamaraj, F. J. Espinosa-Faller, F. Caballero-Briones

Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada (CICATA), Unidad Legaria
Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada (CICATA), Unidad Altamira

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Cs-decorated reduced graphene oxide (CsRGO) was synthesized by addition of a CsOH solution to a GO suspension. The resulting material is amorphous, while GO reduces upon Cs incorporation as Cs₂O-like clusters. Structure modelling indicates that Cs atom replaces hydrogen in hydroxyl and carboxyl groups in the graphene plane. CsRGO exhibits transitions associated to the π-to-π*, remanent C[dbnd]O groups and Cs₂O absorption. The material is n-type semiconductor, with a direct optical band gap of 2.85 eV. Carrier injection from the Cs₂O to RGO enhances H₂-evolution. Stable photocatalytic generation of hydrogen after three four-hour cycles, is attributed to work function reduction, high conductivity, and high optical absorption upon Cs-incorporation.

Original language	English
Article number	131864
Journal	Materials Letters
Volume	314
DOIs	https://doi.org/10.1016/j.matlet.2022.131864
State	Published - 1 May 2022

Keywords

Cs
Decorated GO
Hydrogen photogeneration
Work function

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title = "Cesium-decorated reduced graphene oxide for photocatalytic hydrogen generation",

abstract = "Cs-decorated reduced graphene oxide (CsRGO) was synthesized by addition of a CsOH solution to a GO suspension. The resulting material is amorphous, while GO reduces upon Cs incorporation as Cs2O-like clusters. Structure modelling indicates that Cs atom replaces hydrogen in hydroxyl and carboxyl groups in the graphene plane. CsRGO exhibits transitions associated to the π-to-π*, remanent C[dbnd]O groups and Cs2O absorption. The material is n-type semiconductor, with a direct optical band gap of 2.85 eV. Carrier injection from the Cs2O to RGO enhances H2-evolution. Stable photocatalytic generation of hydrogen after three four-hour cycles, is attributed to work function reduction, high conductivity, and high optical absorption upon Cs-incorporation.",

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T1 - Cesium-decorated reduced graphene oxide for photocatalytic hydrogen generation

AU - Gnanaseelan, N.

AU - Marasamy, Latha

AU - Mantilla, A.

AU - Kamaraj, S. K.

AU - Espinosa-Faller, F. J.

AU - Caballero-Briones, F.

PY - 2022/5/1

Y1 - 2022/5/1

N2 - Cs-decorated reduced graphene oxide (CsRGO) was synthesized by addition of a CsOH solution to a GO suspension. The resulting material is amorphous, while GO reduces upon Cs incorporation as Cs2O-like clusters. Structure modelling indicates that Cs atom replaces hydrogen in hydroxyl and carboxyl groups in the graphene plane. CsRGO exhibits transitions associated to the π-to-π*, remanent C[dbnd]O groups and Cs2O absorption. The material is n-type semiconductor, with a direct optical band gap of 2.85 eV. Carrier injection from the Cs2O to RGO enhances H2-evolution. Stable photocatalytic generation of hydrogen after three four-hour cycles, is attributed to work function reduction, high conductivity, and high optical absorption upon Cs-incorporation.

AB - Cs-decorated reduced graphene oxide (CsRGO) was synthesized by addition of a CsOH solution to a GO suspension. The resulting material is amorphous, while GO reduces upon Cs incorporation as Cs2O-like clusters. Structure modelling indicates that Cs atom replaces hydrogen in hydroxyl and carboxyl groups in the graphene plane. CsRGO exhibits transitions associated to the π-to-π*, remanent C[dbnd]O groups and Cs2O absorption. The material is n-type semiconductor, with a direct optical band gap of 2.85 eV. Carrier injection from the Cs2O to RGO enhances H2-evolution. Stable photocatalytic generation of hydrogen after three four-hour cycles, is attributed to work function reduction, high conductivity, and high optical absorption upon Cs-incorporation.

KW - Cs

KW - Decorated GO

KW - Hydrogen photogeneration

KW - Work function

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U2 - 10.1016/j.matlet.2022.131864

DO - 10.1016/j.matlet.2022.131864

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SN - 0167-577X

VL - 314

JO - Materials Letters

JF - Materials Letters

M1 - 131864

ER -

Cesium-decorated reduced graphene oxide for photocatalytic hydrogen generation

Abstract

Keywords

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