Title of Abstract

Tandem n/p Z-scheme Device for Sustainable Water Splitting in the Absence of Sacrificial Reagents

Poster Number

24

Submitting Student(s)

Janae Massey

Session Title

Poster Session 1

Faculty Sponsor (for work done with a non-Winthrop mentor)

Clifton Harris, Ph.D.

College

College of Arts and Sciences

Department

Chemistry, Physics & Geology

Abstract

Thin films of n-CoIIxFeIII2-xO3-(x/2) and CuIxCd1-xS1-(x/2), referred to as n-Fe2O3 and p-CdS, are deposited onto separate transparent conductive substrates to serve as working and counter electrodes for the oxygen and hydrogen evolving reactions, respectively. Prior to deposition of n-Fe2O3, the substrate is modified by the addition of an ultrathin film of a metal oxide (MOx) which is functionalized with Au. The n-Fe2O3 is then deposited on top of the MOx/Au later, and a Co-Pi co-catalyst is electrodeposited onto the surface of the n-Fe2O3, yielding a MOx/Au/n-Fe2O3/Co-Pi working electrode which also acts as the oxygen evolving catalyst. Prior to deposition of p-CdS, the second substrate is coated with a thin layer of molybdenum (Mo). After depositing p-CdS onto the Mo-coated substrate, a Pt co-catalyst is sputtered onto the surface of the p-CdS, yielding a Mo/p-CdS/Pt counter electrode which also acts as the hydrogen evolving catalyst. Under illumination, the majority charge carriers of each semiconductor material will recombine in the external circuit, allowing the respective redox reactions to occur at each electrode. Structural, morphological, and electrochemical characterizations have been performed. Under suitable conditions, such a tandem may show promise for water splitting without sacrificial reagents.

Start Date

15-4-2022 12:00 PM

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Apr 15th, 12:00 PM

Tandem n/p Z-scheme Device for Sustainable Water Splitting in the Absence of Sacrificial Reagents

Thin films of n-CoIIxFeIII2-xO3-(x/2) and CuIxCd1-xS1-(x/2), referred to as n-Fe2O3 and p-CdS, are deposited onto separate transparent conductive substrates to serve as working and counter electrodes for the oxygen and hydrogen evolving reactions, respectively. Prior to deposition of n-Fe2O3, the substrate is modified by the addition of an ultrathin film of a metal oxide (MOx) which is functionalized with Au. The n-Fe2O3 is then deposited on top of the MOx/Au later, and a Co-Pi co-catalyst is electrodeposited onto the surface of the n-Fe2O3, yielding a MOx/Au/n-Fe2O3/Co-Pi working electrode which also acts as the oxygen evolving catalyst. Prior to deposition of p-CdS, the second substrate is coated with a thin layer of molybdenum (Mo). After depositing p-CdS onto the Mo-coated substrate, a Pt co-catalyst is sputtered onto the surface of the p-CdS, yielding a Mo/p-CdS/Pt counter electrode which also acts as the hydrogen evolving catalyst. Under illumination, the majority charge carriers of each semiconductor material will recombine in the external circuit, allowing the respective redox reactions to occur at each electrode. Structural, morphological, and electrochemical characterizations have been performed. Under suitable conditions, such a tandem may show promise for water splitting without sacrificial reagents.