Photocatalytic hydrogen generation from hydriodic acid using methylammonium lead iodide in dynamic equilibrium with aqueous solution

Sunghak Park, Woo Je Chang, Chan Woo Lee, Sangbaek Park, Hyo-Yong Ahn and Ki Tae Nam ()
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Sunghak Park: Seoul National University
Woo Je Chang: Interdisciplinary Program for Bioengineering, Seoul National University
Chan Woo Lee: Seoul National University
Sangbaek Park: Seoul National University
Hyo-Yong Ahn: Seoul National University
Ki Tae Nam: Seoul National University

Nature Energy, 2017, vol. 2, issue 1, 1-8

Abstract: Abstract 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.

Date: 2017
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DOI: 10.1038/nenergy.2016.185

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