Title of Abstract

Multi-Layered Semiconductor Thin Films Arranged in a p/p Z-scheme Tandem Device for Sustainable Water Splitting in the Absence of Sacrificial Reagents

Poster Number

12

Submitting Student(s)

Savannah Hancock

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

A multi-layered, thin film device mimicking a p/p heterojunction z-scheme electrode has been prepared as a photocatalyst for water splitting. Stacked thin films of doped MIIxFe2-xO3-(x-2) (MII = Zn2+ or Cu2+) and CuIxCd1-xS1-(x/2), referred to as p-Fe2O3 and p-CdS, are deposited onto transparent conductive substrates to act as oxygen and hydrogen evolving catalysts (OEC/HEC), respectively. Prior to addition of the OEC and HEC layers, the substrate surface is modified by addition of an ultrathin film of a metal oxide (MOx) which is functionalized with Au nanoparticles. Afterwards, the HEC is sputtered with Pt. The resulting working electrode is a MOx/Au/p-Fe2O3/p-CdS/Pt composite. Structural, morphological, and electrochemical characterizations have been performed. Under suitable conditions and with proper counter electrodes, these devices may show promise as tandem cells for water splitting without sacrificial reagents.

Start Date

15-4-2022 12:00 PM

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Apr 15th, 12:00 PM

Multi-Layered Semiconductor Thin Films Arranged in a p/p Z-scheme Tandem Device for Sustainable Water Splitting in the Absence of Sacrificial Reagents

A multi-layered, thin film device mimicking a p/p heterojunction z-scheme electrode has been prepared as a photocatalyst for water splitting. Stacked thin films of doped MIIxFe2-xO3-(x-2) (MII = Zn2+ or Cu2+) and CuIxCd1-xS1-(x/2), referred to as p-Fe2O3 and p-CdS, are deposited onto transparent conductive substrates to act as oxygen and hydrogen evolving catalysts (OEC/HEC), respectively. Prior to addition of the OEC and HEC layers, the substrate surface is modified by addition of an ultrathin film of a metal oxide (MOx) which is functionalized with Au nanoparticles. Afterwards, the HEC is sputtered with Pt. The resulting working electrode is a MOx/Au/p-Fe2O3/p-CdS/Pt composite. Structural, morphological, and electrochemical characterizations have been performed. Under suitable conditions and with proper counter electrodes, these devices may show promise as tandem cells for water splitting without sacrificial reagents.