Photocatalytic Hydrogen Generation from Hydriodic Acid Using Methylammonium Lead Iodide in Dynamic Equilibrium with Aqueous Solution

Title
Photocatalytic Hydrogen Generation from Hydriodic Acid Using Methylammonium Lead Iodide in Dynamic Equilibrium with Aqueous Solution
Authors
박상백박승학장우제이찬우Hyo-Yong Ahn남기태
Issue Date
2017-01
Publisher
Nature energy
Citation
VOL 2, NO 1, 16185
Abstract
The solar-driven splitting of hydrohalic acids (HX) is an important and fast growing research direction for H-2 production. In addition to the hydrogen, the resulting chemicals (X-2/X-3(-)) 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 (MAPbI(3)) in an effort to develop a cost-effective and easily scalable process. Considering that MAPbI(3) is awater-soluble ionic compound, we exploit the dynamic equilibrium of the dissolution and precipitation of MAPbI(3) 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 MAPbI(3) phase. Stable and effcient H-2 production under visible light irradiation was demonstrated. The solar HI splitting effciency of MAPbI(3) was 0.81% when using Pt as a cocatalyst.
URI
http://pubs.kist.re.kr/handle/201004/71248
ISSN
2058-7546
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KIST Publication > Article
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