NiFeOx decorated Ge-hematite/perovskite for an efficient water splitting system

Ki-Yong Yoon, Juhyung Park, Minsu Jung, Sang-Geun Ji, Hosik Lee, Ji Hui Seo, Myung-Jun Kwak, Sang Seok, Jun Hee Lee and Ji-Hyun Jang ()
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Ki-Yong Yoon: Ulsan National Institute of Science and Technology (UNIST)
Juhyung Park: Ulsan National Institute of Science and Technology (UNIST)
Minsu Jung: Dong-Eui University
Sang-Geun Ji: Ulsan National Institute of Science and Technology (UNIST)
Hosik Lee: Ulsan National Institute of Science and Technology (UNIST)
Ji Hui Seo: Ulsan National Institute of Science and Technology (UNIST)
Myung-Jun Kwak: Ulsan National Institute of Science and Technology (UNIST)
Sang Seok: Ulsan National Institute of Science and Technology (UNIST)
Jun Hee Lee: Ulsan National Institute of Science and Technology (UNIST)
Ji-Hyun Jang: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract To boost the photoelectrochemical water oxidation performance of hematite photoanodes, high temperature annealing has been widely applied to enhance crystallinity, to improve the interface between the hematite-substrate interface, and to introduce tin-dopants from the substrate. However, when using additional dopants, the interaction between the unintentional tin and intentional dopant is poorly understood. Here, using germanium, we investigate how tin diffusion affects overall photoelectrochemical performance in germanium:tin co-doped systems. After revealing that germanium is a better dopant than tin, we develop a facile germanium-doping method which suppresses tin diffusion from the fluorine doped tin oxide substrate, significantly improving hematite performance. The NiFeOx@Ge-PH photoanode shows a photocurrent density of 4.6 mA cm−2 at 1.23 VRHE with a low turn-on voltage. After combining with a perovskite solar cell, our tandem system achieves 4.8% solar-to-hydrogen conversion efficiency (3.9 mA cm−2 in NiFeOx@Ge-PH/perovskite solar water splitting system). Our work provides important insights on a promising diagnostic tool for future co-doping system design.

Date: 2021
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DOI: 10.1038/s41467-021-24428-7

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