Novel gold dendritic nanoflowers deposited on titanium nitride for photoelectrochemical cells
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This study demonstrates the elaboration of a novel composite comprising gold dendritic nanoflowers (Au DNFs)/titanium nitride (TiN)/silicon (Si); this composite can be used for methanol oxidation reactions in alkaline electrolytes. Cyclic voltammograms showed that a thick (650 nm) Au DNFs/TiN/Si (L-DNFs-TiN) composite had double the oxidation current density of a thick (800 nm) Au DNFs/Si (L-DNFs-Si) composite in the presence of light illumination, whereas the oxidation current density for a thin (250 nm) Au DNFs/Si (S-DNFs-Si) composite and Au nanoparticles could not be determined. Chronoamperometry (CA) testing indicated that the L-DNFs-TiN could absorb light illumination more effectively than the L-DNFs-Si did. These results correspond to the broadband light absorption of TiN. Testing with continuous cyclic on/off light illumination showed a repeatable performance in CA, indicating that the proposed L-DNFs-TiN composite can be applied in photoelectrochemical cells in the future.
KeywordsGold Titanium nitride Methanol Oxidation
The authors are grateful for the SEM analyses of Ms. Nancy Chu from the Instrument Technology Research Center, National Applied Research Laboratories.
The authors are grateful for the financial support of the Ministry of Science and Technology, Taiwan (contract numbers: MOST 105-2221-E-492-003-MY2 and MOST 106-2221-E-239-022).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.