Erik Busby - Academia.edu (original) (raw)
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The generation of H2 via photocatalytic water splitting hasreceived considerable attention in rec... more The generation of H2 via photocatalytic water splitting hasreceived considerable attention in recent years as efforts to optimize solar energy devices have accelerated.13 Although visible photons are sufficiently energetic to split H2O and generate high-energy H2 fuel (requiring a 1.23 eV difference of its coupled half-reactions),4 materials that demonstrate this in any great yield are still not developed. This is due in part to significant overpotentials, rapid recombination of photogener-ated charge carriers, poor absorption of the solar spectrum, and undesired photocorrosion reactions.5,6 The recent advent of semiconductor nanoparticle technology has provided research-ers with the powerful flexibility to design novel materials to address these limitations. For example, band gaps can be tuned relative to their bulk state by quantum confining photogenerated excitons to nanometer dimensions;5,7 this increases the free energy (reduction potential) of charge carriers8 and can exceed
Chemical Physics Letters, 2013
The primary photodynamics of 5-nm CdZnS core, CdZnS/ZnS core/shell, and CdZnS/ZnSÁPd nanoparticle... more The primary photodynamics of 5-nm CdZnS core, CdZnS/ZnS core/shell, and CdZnS/ZnSÁPd nanoparticle adducts are characterized with broadband ultrafast transient absorption spectroscopy. Photogenerated excitons in the CdZnS and CdZnS/ZnS nanoparticles exhibit long-lived (>20 ns) lifetimes and further functionalizing of the type-I CdZnS/ZnS core/shells with Pd nanoparticles resulted in rapid exciton quenching (<250 ps) due to the transfer of electrons from the CdZnS core into the Pd nanocrystals via tunneling through the insulating ZnS shell. The shell-induced surface trap passivation and near-unity charge carrier injection efficiency into a platinum-group metal nanoparticle shows potential for enhanced colloidal photocatalytic applications, while enhancing photostability.
The generation of H2 via photocatalytic water splitting hasreceived considerable attention in rec... more The generation of H2 via photocatalytic water splitting hasreceived considerable attention in recent years as efforts to optimize solar energy devices have accelerated.13 Although visible photons are sufficiently energetic to split H2O and generate high-energy H2 fuel (requiring a 1.23 eV difference of its coupled half-reactions),4 materials that demonstrate this in any great yield are still not developed. This is due in part to significant overpotentials, rapid recombination of photogener-ated charge carriers, poor absorption of the solar spectrum, and undesired photocorrosion reactions.5,6 The recent advent of semiconductor nanoparticle technology has provided research-ers with the powerful flexibility to design novel materials to address these limitations. For example, band gaps can be tuned relative to their bulk state by quantum confining photogenerated excitons to nanometer dimensions;5,7 this increases the free energy (reduction potential) of charge carriers8 and can exceed
Chemical Physics Letters, 2013
The primary photodynamics of 5-nm CdZnS core, CdZnS/ZnS core/shell, and CdZnS/ZnSÁPd nanoparticle... more The primary photodynamics of 5-nm CdZnS core, CdZnS/ZnS core/shell, and CdZnS/ZnSÁPd nanoparticle adducts are characterized with broadband ultrafast transient absorption spectroscopy. Photogenerated excitons in the CdZnS and CdZnS/ZnS nanoparticles exhibit long-lived (>20 ns) lifetimes and further functionalizing of the type-I CdZnS/ZnS core/shells with Pd nanoparticles resulted in rapid exciton quenching (<250 ps) due to the transfer of electrons from the CdZnS core into the Pd nanocrystals via tunneling through the insulating ZnS shell. The shell-induced surface trap passivation and near-unity charge carrier injection efficiency into a platinum-group metal nanoparticle shows potential for enhanced colloidal photocatalytic applications, while enhancing photostability.