Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 37, Pages 18852-18859Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta06255a
Keywords
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Funding
- Basic Research Program of China [2014CB239402]
- Natural Science Foundation of China [21373040, 21120102036, 91233201]
- Ph.D. Program Foundation of Ministry of Education of China [20130041110024]
- Fundamental Research Funds for the Central Universities [DUT13RC(3)103]
- Swedish Research Council
- Swedish Energy Agency
- K & A Wallenberg Foundation
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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.
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