Size-dependent electrocatalytic activities of printed Co3O4 films for a monolithic photovoltaic-electrolytic hydrogen generation system

Title
Size-dependent electrocatalytic activities of printed Co3O4 films for a monolithic photovoltaic-electrolytic hydrogen generation system
Authors
전효상아궁김재훈김홍곤민병권
Keywords
hydrogen; electrocatalyst; Co3O4; Water splitting; Electrochemical; Particle size
Issue Date
2011-08
Publisher
International journal of hydrogen energy
Citation
VOL 36, NO 17, 10587-10592
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.
URI
http://pubs.kist.re.kr/handle/201004/40631
ISSN
0360-3199
Appears in Collections:
KIST Publication > Article
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