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Solar Water Oxidation by Multicomponent TaON Photoanodes Functionalized with Nickel Oxide.

Satnam Singh Gujral¹, Alexandr N Simonov¹, Xi-Ya Fang²

¹School of Chemistry, and the ARC Centre of Excellence for Electromaterials Science, Monash University, Melbourne, VIC, 3800, Australia.

|January 23, 2020

Summary

Nickel oxide (NiO_x) functionalization significantly boosts solar water oxidation efficiency in titanium dioxide-tantalum oxynitride (TiO₂-TaON) photoanodes. This enhancement, however, is accompanied by performance degradation and morphological changes over time.

Keywords:

electrodeposition nickel oxide tantalum oxynitride water splitting

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Area of Science:

Materials Science
Photocatalysis
Electrochemistry

Background:

Efficient solar water oxidation is crucial for renewable energy production.
Tantalum oxynitride (TaON) is a promising photoanode material but suffers from low activity and stability.
Coupling TaON with electrocatalysts is necessary to improve performance.

Purpose of the Study:

To investigate the impact of electrodeposited nickel oxide (NiO_x) on the performance of TiO₂-TaON photoanodes.
To explore the relationship between NiO_x electrodeposition parameters, anode microstructure, and photocatalytic activity.
To assess the stability of NiO_x-functionalized TaON photoanodes under water oxidation conditions.

Main Methods:

Screen-printing of TiO₂-TaON photoanodes.
Photo-electrodeposition of NiO_x onto TiO₂-TaON.
Characterization of anode microstructure and morphology.
Evaluation of transient water oxidation photocurrent densities.
Long-term stability testing under photo-oxidative conditions.

Main Results:

NiO_x/TiO₂-TaON photoanodes exhibited a sixfold increase in photocurrent density compared to unmodified TiO₂-TaON.
Electrodeposition parameters influenced the microstructure and photocatalytic performance of the anodes.
Long-term stability tests showed a gradual performance decrease.
Morphological changes in NiO_x deposits were observed during prolonged operation.

Conclusions:

Electrodeposition of NiO_x is an effective strategy to enhance the solar water oxidation activity of TaON-based photoanodes.
The performance gains are significant but limited by long-term stability issues.
Further research is needed to mitigate degradation and optimize the stability of these multicomponent photocatalysts.