CdSe quantum dots/molecular cobalt catalyst co-grafted open porous NiO film as a photocathode for visible light driven H-2 evolution from neutral water
2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, no 37, 18852-18859 p.Article in journal (Refereed) Published
An active noble-metal-free photocathode was fabricated by co-grafting water-soluble thioglycolic acid-stabilized CdSe quantum dots and a molecular cobaloxime catalyst (CoP) through chemical linkage on a p-type open porous NiO film. This photocathode was used as a working electrode in a three-electrode cell, which displayed a photocurrent density up to 110 mu A cm(-2) at an applied potential of 0 V vs. NHE in 0.1 M Na2SO4 solution at pH 6.8 upon visible light illumination. The comparative studies showed that the open porous NiO/CdSe electrode did display a higher photocurrent density than that exhibited by an analogous planar NiO/CdSe electrode made by doctor-blading a NiO paste. Long-time photoelectrolysis experiments revealed that about 83% of the photocurrent density remained after 3.5 h illumination at 0.2 V vs. NHE. The open porous NiO/CdSe/CoP photocathode showed a considerably better current density and photocatalytic stability compared to the so-far reported dye-or QD-sensitized NiO cathodes with a cobaloxime catalyst chemically attached or physically adsorbed on the electrode surface under similar conditions.
Place, publisher, year, edition, pages
2015. Vol. 3, no 37, 18852-18859 p.
IdentifiersURN: urn:nbn:se:kth:diva-175519DOI: 10.1039/c5ta06255aISI: 000361553100008ScopusID: 2-s2.0-84941627483OAI: oai:DiVA.org:kth-175519DiVA: diva2:862245
FunderSwedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation
QC 201510212015-10-212015-10-162015-10-21Bibliographically approved