Journal ArticleDOI
H2 evolution at Si-based metal–insulator–semiconductor photoelectrodes enhanced by inversion channel charge collection and H spillover
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TLDR
A metal-insulator-semiconductor (MIS) photoelectrode architecture that allows for stable and efficient water splitting using narrow bandgap semiconductors is employed and offers the possibility of highly efficient PEC water splitting.Abstract:
Photoelectrochemical (PEC) water splitting represents a promising route for renewable production of hydrogen, but trade-offs between photoelectrode stability and efficiency have greatly limited the performance of PEC devices. In this work, we employ a metal-insulator-semiconductor (MIS) photoelectrode architecture that allows for stable and efficient water splitting using narrow bandgap semiconductors. Substantial improvement in the performance of Si-based MIS photocathodes is demonstrated through a combination of a high-quality thermal SiO2 layer and the use of bilayer metal catalysts. Scanning probe techniques were used to simultaneously map the photovoltaic and catalytic properties of the MIS surface and reveal the spillover-assisted evolution of hydrogen off the SiO2 surface and lateral photovoltage driven minority carrier transport over distances that can exceed 2 cm. The latter finding is explained by the photo- and electrolyte-induced formation of an inversion channel immediately beneath the SiO2/Si interface. These findings have important implications for further development of MIS photoelectrodes and offer the possibility of highly efficient PEC water splitting.read more
Citations
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Engineering heterogeneous semiconductors for solar water splitting
TL;DR: In this paper, a critical review highlights some key factors influencing the efficiency of heterogeneous semiconductors for solar water splitting (i.e. improved charge separation and transfer, promoted optical absorption, optimized band gap position, lowered cost and toxicity, and enhanced stability and water splitting kinetics).
Journal ArticleDOI
Engineering BiOX (X = Cl, Br, I) nanostructures for highly efficient photocatalytic applications
TL;DR: Recent advances and emerging strategies in tailoring BiOX (X = Cl, Br, I) nanostructures to boost their photocatalytic properties are surveyed.
Journal ArticleDOI
Will Solar-Driven Water-Splitting Devices See the Light of Day?
TL;DR: In this paper, the major design constraints that motivate continued research in the field of solar-driven water splitting are summarized, and key device components that are now available for use in demonstration systems and prototypes.
Journal ArticleDOI
High-Performance Silicon Photoanodes Passivated with Ultrathin Nickel Films for Water Oxidation
TL;DR: In this article, a metal-insulator-semiconductor photo-anode for photoelectrochemical (PEC) water oxidation in both aqueous potassium hydroxide (KOH, pH = 14) and aaqueous borate buffer (pH = 9.5) solutions is presented.
Journal ArticleDOI
Photocatalytic Water Splitting: Quantitative Approaches toward Photocatalyst by Design
TL;DR: In this paper, the fundamental aspects of photocatalytic water splitting into hydrogen and oxygen by using light from the solar spectrum, which is one of the most investigated photosynthetic reactions, are discussed.
References
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Solar Water Splitting Cells
Michael G. Walter,Emily L. Warren,James R. McKone,Shannon W. Boettcher,Qixi Mi,Elizabeth A. Santori,Nathan S. Lewis +6 more
TL;DR: The biggest challenge is whether or not the goals need to be met to fully utilize solar energy for the global energy demand can be met in a costeffective way on the terawatt scale.
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TL;DR: The Atlas of Electrochemical Equilibria in Aqueous solutions as discussed by the authors is the most complete and complete work on aqueous solvents, which includes a detailed description of the properties of the solvers.
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Semiconductor-based Photocatalytic Hydrogen Generation
TL;DR: Approaches to Modifying the Electronic Band Structure for Visible-Light Harvesting and its Applications d0 Metal Oxide Photocatalysts 6518 4.4.1.
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Electrochemistry at Semiconductor and Oxidized Metal Electrodes
TL;DR: In this paper, the authors present a theoretical analysis of the energy levels at the surface of a delectable deformed deformed metal deformed by Mott-Schottky Plots.