Design of an amorphous TaOx multifunctional interfacial layer on photoelectrodes for photoelectrochemical H2 evolution
- Design of an amorphous TaOx multifunctional interfacial layer on photoelectrodes for photoelectrochemical H2 evolution
- 주오심; 채상윤; 김수민
- Photoelctrochemical cell; water splitting; H2; TaOx
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 7, NO 5-2047
- A novel TaOx multifunctional layer which is transparent and co-catalytically active was applied to photoelectrodes for hydrogen production. We found that amorphous TaOx was in situ transformed into amorphous TaOx/Ta(OH)x in the photoelectrochemical reaction, which is a more active form for hydrogen evolution. The TaOx/Ta(OH)x multifunctional layer enhanced not only charge separation but also stability and HER kinetics when it was deposited on a p-type CuInS2 model photocathode. The new band alignment and the widened depletion region of CuInS2/TaOx were revealed by electrochemical impedance spectroscopy and IPCE analysis. The TaOx deposited CuInS2 photocathode shows a higher photocurrent at 0.3 V vs. RHE compared to CuInS2 or even Pt-decorated CuInS2. A novel multifunctional layer was successfully designed and demonstrated for photocathodes without noble metals, which can minimize the structure of photoelectrodes.
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