(499c) Nanostructured Ti –Fe2O3/Cu2O Bilayered Thin Films for Photoelectrochemical Water Splitting | AIChE

(499c) Nanostructured Ti –Fe2O3/Cu2O Bilayered Thin Films for Photoelectrochemical Water Splitting

Authors 

Sharma, D. - Presenter, Dayalbagh Educational Institute
Upadhyay, S., Dayalbagh Educational Institute
Choudhary, S., Dayalbagh Educational Institute
Satsangi, V. R., Dayalbagh Educational Institute
Shrivastav, R., Dayalbagh Educational Institute
Dass, S., Dayalbagh Educational Institute



 

Nanostructured Ti-Fe2O3/Cu2O
Bilayered Thin Films for Photoelectrochemical Splitting of Water

 

Dipika Sharma, Sumant Upadhyay, Surbhi Choudhary, Vibha
R. Satsangi?,

Rohit Shrivastav and Sahab Dass,

 

Department
of Chemistry, ?Department of Physics & Computer Sciences

 Faculty
of Science, Dayalbagh Educational Institute (Deemed University),

Agra-282110 (India)

 

Nanostructured thin
films of pure Fe2O3, Ti ?Fe2O3, Cu2O,
and bilayered Fe2O3/Cu2O, Ti-Fe2O3/Cu2O
were deposited on ITO glass substrate using spray pyrolysis method.  Among
various metal oxide semiconductors, cuprous oxide Cu2O [Eg=2.4eV] and Iron oxide Fe2O3 [Eg=2.1eV] were
chosen for the present study on account of
being abundant, non-toxic, environmentally
safe, having low band gap and possess staggered type band edges which is
suitable for efficient charge separation in water splitting process.

All samples were
characterized using XRD, SEM and UV?Vis spectrometry. Photo electrochemical
properties were also investigated in a three-electrode cell system. UV-Vis
absorption spectrum for pure Fe2O3, Ti ?Fe2O3,
Cu2O, and Fe2O3/Cu2O, Ti-Fe2O3/Cu2O
bilayered thin films shows absorption in visible light region. Nanostructured thin films for all the samples were
used as photoelectrode in the Photoelectrochemical cell for water splitting
reaction.  Maximum photocurrent density of 2.22 mA/cm2 at 0.95 V/SCE
was exhibited by 454 nm thick Ti-Fe2O3/Cu2O bilayered
photoelectrode (Fig.1). Increased photocurrent density and enhanced
photoconversion efficiency, exhibited by the bilayered thin films may be
attributed to improved conductivity and efficient separation of the
photogenerated charge carriers at the Ti-Fe2O3/Cu2O
interface. 

Fig. 1
Photocurrent density vs. Applied potential curve for pure Cu2O(A),
Fe2O3(B), Ti ?Fe2O3(C), and Fe2O3/Cu2O(D),
Ti-Fe2O3/Cu2O(E) bilayered
thin films respectively ,under visible light illumination in 0.1M NaOH
electrolytic solution using 150W visible light source of irradiation 150 mW cm-2
at the position of sample.

 

Keywords: Photoelectrochemical,
Water splitting, Bilayered,
Cu2O, Fe2O3, Ti- Fe2O3, Spray-Pyrolysis