Wavelength-switchable photocurrent in a hybrid TiO₂–Ag nanocluster photoelectrode

Abstract

A hybrid TiO2-Ag nanocluster (NC) photoelectrode demonstrates unique wavelength-switchable photocurrent. By simply tuning the light wavelength from ultraviolet (UV) to visible light, the photocurrent generated on a single electrode can be switched from anodic to cathodic current, in which the Ag NCs behave like a new type of visible light active photocatalyst.

Photoelectrode for water splitting: Materials, fabrication and characterization

“…1 in comparison with the standard redox potential of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Taking the TiO 2 for example, its CB and VB lay at −0.2 and 3 V vs. RHE respectively, which straddle the oxidative potential of H + / H 2 and the reductive potential of H 2 O/O 2 , as confirmed in literature [6,20,21].…”

Switched Photocurrent on Tin Sulfide‐Based Nanoplate Photoelectrodes

“…To date, several stimuli including potential, wavelength, and pH value are applied to switch the photocurrent direction . Recently, new systems, such as hybrid n‐/p‐type semiconductors, TiO 2 ‐supported Au nanoparticles, and TiO 2 ‐supported Ag nanoclusters, have been reported to tune the photocurrent direction. However, transforming n‐type semiconductors into p‐type semiconductors by controlling the calcination temperature and further switching the photocurrent has rarely been reported.…”

“…[14] To date, severals timuli including potential, wavelength, and pH value are applied to switch the photocurrentd irection. [15][16][17] Recently,n ew systems, such as hybrid n-/p-type semiconductors, [18] TiO 2 -supported Au nanoparticles, [19] and TiO 2 -supported Ag nanoclusters, [20] have been reported to tune the photocurrent direction. However, transforming n-type semiconductors into p-type semiconductors by controlling the calcination temperature and further switching the photocurrenth as rarely been reported.Herein we report the cost-effective fabrication of an ew ptype SnS nanoplate photoelectrode directly on af luorinedoped tin oxide (FTO) substrate through asimple wet-chemical method.…”

Constructing SrTiO3–TiO2 Heterogeneous Hollow Multi‐shelled Structures for Enhanced Solar Water Splitting

“…As indicated in Figure d, STHoMSs samples showed much smaller semicircle diameters and much lower interfacial charge‐transfer resistance than SrTiO 3 nanoparticles under light irradiation, suggesting that the SrTiO 3 −TiO 2 heterojunction indeed favored the interfacial charge‐carrier transfer of the STHoMSs samples. Among the fabricated samples, the STHoMSs with 12 h hydrothermal conversion exhibited the lowest PL lifetime, PL emission intensity, and charge‐transfer resistance, which rendered STO 12 h the highest photocurrent response and photocatalytic performance (Supporting Information, Figure S8 b,c). As a result, the hydrothermal reaction time was optimized to be 12 h for synthesizing SrTiO 3 −TiO 2 hollow structures.…”