Applied Catalysis2022，Vol.31511.DOI:10.1016/j.apcatb.2022.121538

Enhanced charge transfer with tuning surface state in hematite photoanode integrated by niobium and zirconium co-doping for efficient photoelectrochemical water splitting

Jang, Jum Suk Dhandole, Love Kumar Koh, Tae Sik Anushkkaran, Periyasamy Chung, Hee-Suk Chae, Weon-Sik Lee, Hyun Hwi Choi, Sun Hee Cho, Min
Applied Catalysis2022，Vol.31511.DOI:10.1016/j.apcatb.2022.121538
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  • NSTL
  • Elsevier

Enhanced charge transfer with tuning surface state in hematite photoanode integrated by niobium and zirconium co-doping for efficient photoelectrochemical water splitting

Jang, Jum Suk 1Dhandole, Love Kumar 1Koh, Tae Sik 1Anushkkaran, Periyasamy 1Chung, Hee-Suk 2Chae, Weon-Sik 2Lee, Hyun Hwi 3Choi, Sun Hee 3Cho, Min1
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作者信息

  • 1. Jeonbuk Natl Univ
  • 2. Korea Basic Sci Inst
  • 3. Pohang Univ Sci & Technol POSTECH
  • 折叠

Abstract

Niobium and zirconium co-doping was introduced into a hematite (Fe2O3) photoanode by a facile two-step synthesis. The hydrothermally prepared zirconium-doped photoanode shows a reduction in the crystallite size of hematite, with H(104) being the dominant photoactive phase. The incorporation of niobium ions by drop -casting and high-temperature annealing does not alter the crystallinity. The core 3d spin-orbit splitting shows the Nb4+ oxidation state forming NbO2 in the hematite lattice. The Nb4+-Zr4+ co-doped hematite photoanode, prepared on a fluorine-tin oxide glass substrate, shows an enhanced photocurrent density of 2.05 mA cm(-2) with no co-catalyst. This enhanced performance is attributed to the Zr4+ doping, which improves the bulk charge transfer in hematite, and Nb4+ suppressed charge recombination in the surface state holes at the electro-de-electrolyte interface. This synergistic improvement of bulk and surface properties leads to stable water splitting at the water oxidation potential (1.23 VRHE) of the Nb-Zr co-doped hematite photoanode.

Key words

Hematite/Photoanode/Co-doping/Tetravalent ions/Photoelectrochemical water splitting/PHOTOCATALYTIC ACTIVITY/OXIDATION/WO3

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出版年

2022
Applied Catalysis

Applied Catalysis

ISSN：0926-3373
被引量22
参考文献量28
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