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All-perovskite-based unassisted photoelectrochemical water splitting system for efficient, stable and scalable solar hydrogen production
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All-perovskite-based unassisted photoelectrochemical water splitting system for efficient, stable and scalable solar hydrogen production
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Journal Article
All-perovskite-based unassisted photoelectrochemical water splitting system for efficient, stable and scalable solar hydrogen production
2024
Overview
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 (FAPbI
3
) perovskite-based photoanode that is encapsulated by an Ni foil/NiFeOOH electrocatalyst, which demonstrates promising efficiency, stability and scalability. This metal-encapsulated FAPbI
3
photoanode records a photocurrent density of 22.8 mA cm
−2
at 1.23 V
RHE
(where V
RHE
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 FAPbI
3
solar cell in parallel, which records a solar-to-hydrogen efficiency of 9.8%. Finally, we demonstrate the scale-up of these Ni-encapsulated FAPbI
3
photoanodes into mini-modules up to 123 cm
2
in size, recording a solar-to-hydrogen efficiency of 8.5%.
Ideal photoelectrochemical systems for hydrogen production should be highly efficient, stable and scalable. Here the authors report that a perovskite-based system with promising efficiency and stability can be scaled to cells of several square centimetres in area as well as formed into mini-modules with overall area >100 cm
2
.
