The solar-driven splitting of hydrohalic acids (HX) is an important and fast growing research direction for H2 production. In addition to the hydrogen, the resulting chemicals (X2/X3−) can be used to propagate a continuous process in a closed cycle and are themselves useful products. Here we present a strategy for photocatalytic hydrogen iodide (HI) splitting using methylammonium lead iodide (MAPbI3) in an effort to develop a cost-effective and easily scalable process. Considering that MAPbI3 is a water-soluble ionic compound, we exploit the dynamic equilibrium of the dissolution and precipitation of MAPbI3 in saturated aqueous solutions. The I− and H+ concentrations of the aqueous solution are determined to be the critical parameters for the stabilization of the tetragonal MAPbI3 phase. Stable and efficient H2 production under visible light irradiation was demonstrated. The solar HI splitting efficiency of MAPbI3 was 0.81% when using Pt as a cocatalyst.
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This research was supported by the Global Frontier R&D Program of the Center for Multiscale Energy System funded by the National Research Foundation under the Ministry of Science, ICT & Future, Korea (2012M3A6A7054855), by KIST Institutional Program (0543-20160004), and by the Ministry of Trade, Industry & Energy (MOTIE) under Industrial Strategic Technology Development Program, Korea (0417-2016-0019).
The authors declare no competing financial interests.
Supplementary Figures 1–14, Supplementary Table 1 and 2, Supplementary References. (PDF 1539 kb)
Phase change of MAPbI3 powder (black) into MAPb(I1−xBrx)3 (orange) immediately after dipping into HBr saturated solution (transparent) because of the dynamic equilibrium between powder and saturated solution, with the powder changing colour from black to orange as the Br atoms substituted and the solution changing to yellow due to I atoms dissolving into the solution resulting in the formation of ions. (AVI 32912 kb)
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Park, S., Chang, W., Lee, C. et al. Photocatalytic hydrogen generation from hydriodic acid using methylammonium lead iodide in dynamic equilibrium with aqueous solution. Nat Energy 2, 16185 (2017). https://doi.org/10.1038/nenergy.2016.185
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