All-perovskite-based unassisted photoelectrochemical water splitting system for efficient, stable and scalable solar hydrogen production

Dharmesh Hansora, Jin Wook Yoo, Rashmi Mehrotra, Woo Jin Byun, Dongjun Lim, Young Kyeong Kim, Eunseo Noh, Hankwon Lim (), Ji-Wook Jang (), Sang Il Seok () and Jae Sung Lee ()
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Dharmesh Hansora: Ulsan National Institute of Science and Technology
Jin Wook Yoo: Ulsan National Institute of Science and Technology
Rashmi Mehrotra: Ulsan National Institute of Science and Technology
Woo Jin Byun: Ulsan National Institute of Science and Technology
Dongjun Lim: Ulsan National Institute of Science and Technology
Young Kyeong Kim: Ulsan National Institute of Science and Technology
Eunseo Noh: Ulsan National Institute of Science and Technology
Hankwon Lim: Ulsan National Institute of Science and Technology
Ji-Wook Jang: Ulsan National Institute of Science and Technology
Sang Il Seok: Ulsan National Institute of Science and Technology
Jae Sung Lee: Ulsan National Institute of Science and Technology

Nature Energy, 2024, vol. 9, issue 3, 272-284

Abstract: Abstract For practical photoelectrochemical water splitting to become a reality, highly efficient, stable and scalable photoelectrodes are essential. However, meeting these requirements simultaneously is a difficult task, as improvements in one area can often lead to deteriotation in others. Here, addressing this challenge, we report a formamidinium lead triiodide (FAPbI3) perovskite-based photoanode that is encapsulated by an Ni foil/NiFeOOH electrocatalyst, which demonstrates promising efficiency, stability and scalability. This metal-encapsulated FAPbI3 photoanode records a photocurrent density of 22.8 mA cm−2 at 1.23 VRHE (where VRHE is voltage with respect to the reversible hydrogen electrode) and shows excellent stability for 3 days under simulated 1-sun illumination. We also construct an all-perovskite-based unassisted photoelectrochemical water splitting system by connecting the photoanode with a same-size FAPbI3 solar cell in parallel, which records a solar-to-hydrogen efficiency of 9.8%. Finally, we demonstrate the scale-up of these Ni-encapsulated FAPbI3 photoanodes into mini-modules up to 123 cm2 in size, recording a solar-to-hydrogen efficiency of 8.5%.

Date: 2024
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DOI: 10.1038/s41560-023-01438-x

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