Size-dependent electrocatalytic activities of printed Co3O4 films for a monolithic photovoltaic-electrolytic hydrogen generation system
- Size-dependent electrocatalytic activities of printed Co3O4 films for a monolithic photovoltaic-electrolytic hydrogen generation system
- 전효상; 아궁; 김재훈; 김홍곤; 민병권
- hydrogen; electrocatalyst; Co3O4; Water splitting; Electrochemical; Particle size
- Issue Date
- International journal of hydrogen energy
- VOL 36, NO 17, 10587-10592
- 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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