Tandem n/p Z-scheme Device for Sustainable Water Splitting in the Absence of Sacrificial Reagents
Poster Number
24
Session Title
Poster Session 1
College
College of Arts and Sciences
Department
Chemistry, Physics, Geology, & the Environment
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
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.
