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Hematite heterostructures for photoelectrochemical water splitting: rational materials design and charge carrier dynamics

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      Abstract

      Different approaches to improving photoelectrochemical performance through α-Fe 2O 3 heterostructure design.

      Abstract

      Hematite (α-Fe 2O 3), with a bandgap suitable for absorption of the solar spectrum, is ideally suited for use as a photoanode material in photoelectrochemical (PEC) conversion of solar light into hydrogen fuel via water splitting. However, low hole mobility, short hole lifetime, high density of surface states, and slow kinetics for oxygen evolution at the α-Fe 2O 3/electrolyte interface have limited the PEC performance of α-Fe 2O 3 photoanodes to date. Along with numerous reports on doping and nanostructuring of α-Fe 2O 3, increased attention has been paid to α-Fe 2O 3 heterostructure design for improved PEC performance. This review article provides an overview of four main approaches to rational heterostructure design: coupling α-Fe 2O 3 with (1) an n- or p-type semiconductor for promoting charge separation; (2) a nanotextured conductive substrate for efficient charge collection; (3) a surface/interface passivation layer for reduced surface/interface charge recombination; (4) a catalyst for accelerated water oxidation kinetics. The achievements to date demonstrate that high PEC performance may be accessed with these designs. In addition, we review time-resolved laser techniques used to probe the charge carrier dynamics of these heterostructures. Dynamic studies have provided insight into the mechanisms responsible for the improved PEC performance in these materials and helped to guide continued design of α-Fe 2O 3 heterostructures for further enhancement of PEC water splitting. As summarized in this review article, rational heterostructure design is a promising strategy to push forward the application of α-Fe 2O 3 for potential low cost and high efficiency solar hydrogen conversion. A better fundamental understanding of the charge carrier dynamics in these structures in turn helps to guide and improve the heterostructure design.

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            Author and article information

            Journal
            EESNBY
            Energy & Environmental Science
            Energy Environ. Sci.
            Royal Society of Chemistry (RSC)
            1754-5692
            1754-5706
            2016
            2016
            : 9
            : 9
            : 2744-2775
            10.1039/C6EE01845A
            © 2016
            Product
            Self URI (article page): http://xlink.rsc.org/?DOI=C6EE01845A

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