Light induced water oxidation on cobalt-phosphate (Co–Pi) catalyst modified semi-transparent, porous SiO2–BiVO4 electrodes
Literature Information
Satyananda Kishore Pilli, Todd G. Deutsch, Thomas E. Furtak, John A. Turner, Logan D. Brown, Andrew M. Herring
A facile and simple procedure for the synthesis of semi-transparent and porous SiO2–BiVO4 electrodes is reported. The method involves a surfactant assisted metal–organic decomposition at 500 °C. An earth abundant oxygen evolution catalyst (OEC), cobalt phosphate (Co–Pi), has been used to modify the SiO2–BiVO4 electrode by electrodeposition (ED) and photoassisted electrodeposition (PED) methods. Modified electrodes by these two methods have been examined for light induced water oxidation and compared to the unmodified SiO2–BiVO4 electrodes by various photoelectrochemical techniques. The PED method was a more effective method of OEC preparation than the ED method as evidenced by an increased photocurrent magnitude during photocurrent-potential (I–V) characterizations. Electrode surfaces catalyzed by PED exhibited a very large cathodic shift (∼420 mV) in the onset potential for water oxidation. The chopped-light I–V measurements performed at different intervals over 24-hour extended testing under illumination and applied bias conditions show a fair photostability for PED Co–Pi modified SiO2–BiVO4.
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