Water splitting for hydrogen production using a high surface area RuO2 electrocatalyst synthesized in supercritical water

Title
Water splitting for hydrogen production using a high surface area RuO2 electrocatalyst synthesized in supercritical water
Authors
전효상안토니우스김재훈민병권
Keywords
RuO2; water splitting
Issue Date
2012-06
Publisher
International Conference on Hydrogen Production (ICH2P)
Abstract
In water electrolysis, the major obstacle would be an anodic reaction for water oxidation where substantial energy loss occurs mainly due to the large overpotential. Therefore, the role of electrocatalytic material of an anode is of importance to achieve highly efficient water splitting reaction. Among the various requirements surface area of electrocatalysts has been known to be a key factor in electrocatalytic reactions. In this study, to obtain high surface area RuO2 electrocatalyst supercritical hydrothermal synthetic method was applied. Indeed, RuO2 particles with the surface area of 78.2 ㎡/g was successfully synthesized, which is 7 times higher compared with the commercial one. We also investigated electrocatalytic activity of the synthesized high surface area RuO2 by evaluating the number of active sites and hydrogen production rates and compared with the commercial one as a reference. Based on the cyclic voltammetric measurements, the number of active sites was estimated to 152.1 mC cm-2 and 17.0 mC cm-2 for the synthetic and the commercial RuO2, respectively. More importantly, the hydrogen production rates measured by the water splitting device with RuO2 films for the anode showed 4 times higher value for the synthetic RuO2 compared with the commercial one. The details of structural and electrochemical properties of the RuO2 electrocatalyst synthesized by supercritical hydrothermal method will be discussed in the presentation.
URI
http://pubs.kist.re.kr/handle/201004/44188
Appears in Collections:
KIST Publication > Conference Paper
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