Size-dependent electrocatalytic activities of printed Co3O 4 films for a monolithic photovoltaic-electrolytic hydrogen generation system

Hyo Sang Jeon; Agung Nugroho; Jaehoon Kim; Honggon Kim; Byoung Koun Min

doi:10.1016/j.ijhydene.2011.06.006

Size-dependent electrocatalytic activities of printed Co₃O ₄ films for a monolithic photovoltaic-electrolytic hydrogen generation system

Hyo Sang Jeon, Agung Nugroho, Jaehoon Kim, Honggon Kim, Byoung Koun Min

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

7 Citations (Scopus)

Abstract

As an electrocatalyst in a monolithic PV-electrolytic cell for water splitting hydrogen generation Co₃O₄ films were prepared by a paste coating method using Co₃O₄ particles. Different sized Co₃O₄ particles with average diameters of 145.9, 63.3 and 36.5 nm were prepared using a supercritical hydrothermal synthesis method. Electrochemical properties with respect to the particle size in the film were investigated by evaluating overpotential, charge transfer resistance (R_ct), and number of active sites (q). The relation between overpotential in water oxidation at 5 mA/cm² and BET surface area showed a slope of -73.8 ± 6.6, implying strong particle size dependence on electrocatalytic activity. Moreover, the R_ct and q values and the actual hydrogen evolution rate indicated that the electrocatalytic activity of Co₃O₄ is attributed to physical properties (e.g. particle size) of the film. Whereas, intrinsic single site activity of the film was not significantly changed with respect to the particle size in the film.

Original language	English
Pages (from-to)	10587-10592
Number of pages	6
Journal	International Journal of Hydrogen Energy
Volume	36
Issue number	17
DOIs	https://doi.org/10.1016/j.ijhydene.2011.06.006
Publication status	Published - 2011 Aug

Bibliographical note

Funding Information:
We gratefully acknowledge the support of the program of Korea Institute of Science and Technology (KIST) as well as the “National Agenda Project” program of Korea Research Council of Fundamental Science & Technology (KRCF).

Keywords

CoO
Electrocatalysts
Electrochemical
Hydrogen
Particle size
Water splitting

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2011.06.006

Cite this

@article{44ccf2bddd7c4bb3b0c8c0644c11d60e,

title = "Size-dependent electrocatalytic activities of printed Co3O 4 films for a monolithic photovoltaic-electrolytic hydrogen generation system",

abstract = "As an electrocatalyst in a monolithic PV-electrolytic cell for water splitting hydrogen generation Co3O4 films were prepared by a paste coating method using Co3O4 particles. Different sized Co3O4 particles with average diameters of 145.9, 63.3 and 36.5 nm were prepared using a supercritical hydrothermal synthesis method. Electrochemical properties with respect to the particle size in the film were investigated by evaluating overpotential, charge transfer resistance (Rct), and number of active sites (q). The relation between overpotential in water oxidation at 5 mA/cm2 and BET surface area showed a slope of -73.8 ± 6.6, implying strong particle size dependence on electrocatalytic activity. Moreover, the Rct and q values and the actual hydrogen evolution rate indicated that the electrocatalytic activity of Co3O4 is attributed to physical properties (e.g. particle size) of the film. Whereas, intrinsic single site activity of the film was not significantly changed with respect to the particle size in the film.",

keywords = "CoO, Electrocatalysts, Electrochemical, Hydrogen, Particle size, Water splitting",

author = "Jeon, {Hyo Sang} and Agung Nugroho and Jaehoon Kim and Honggon Kim and Min, {Byoung Koun}",

note = "Funding Information: We gratefully acknowledge the support of the program of Korea Institute of Science and Technology (KIST) as well as the “National Agenda Project” program of Korea Research Council of Fundamental Science & Technology (KRCF).",

year = "2011",

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doi = "10.1016/j.ijhydene.2011.06.006",

language = "English",

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AU - Jeon, Hyo Sang

AU - Nugroho, Agung

AU - Kim, Jaehoon

AU - Kim, Honggon

AU - Min, Byoung Koun

N1 - Funding Information: We gratefully acknowledge the support of the program of Korea Institute of Science and Technology (KIST) as well as the “National Agenda Project” program of Korea Research Council of Fundamental Science & Technology (KRCF).

PY - 2011/8

Y1 - 2011/8

N2 - As an electrocatalyst in a monolithic PV-electrolytic cell for water splitting hydrogen generation Co3O4 films were prepared by a paste coating method using Co3O4 particles. Different sized Co3O4 particles with average diameters of 145.9, 63.3 and 36.5 nm were prepared using a supercritical hydrothermal synthesis method. Electrochemical properties with respect to the particle size in the film were investigated by evaluating overpotential, charge transfer resistance (Rct), and number of active sites (q). The relation between overpotential in water oxidation at 5 mA/cm2 and BET surface area showed a slope of -73.8 ± 6.6, implying strong particle size dependence on electrocatalytic activity. Moreover, the Rct and q values and the actual hydrogen evolution rate indicated that the electrocatalytic activity of Co3O4 is attributed to physical properties (e.g. particle size) of the film. Whereas, intrinsic single site activity of the film was not significantly changed with respect to the particle size in the film.

AB - As an electrocatalyst in a monolithic PV-electrolytic cell for water splitting hydrogen generation Co3O4 films were prepared by a paste coating method using Co3O4 particles. Different sized Co3O4 particles with average diameters of 145.9, 63.3 and 36.5 nm were prepared using a supercritical hydrothermal synthesis method. Electrochemical properties with respect to the particle size in the film were investigated by evaluating overpotential, charge transfer resistance (Rct), and number of active sites (q). The relation between overpotential in water oxidation at 5 mA/cm2 and BET surface area showed a slope of -73.8 ± 6.6, implying strong particle size dependence on electrocatalytic activity. Moreover, the Rct and q values and the actual hydrogen evolution rate indicated that the electrocatalytic activity of Co3O4 is attributed to physical properties (e.g. particle size) of the film. Whereas, intrinsic single site activity of the film was not significantly changed with respect to the particle size in the film.

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