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Pazos-Outón Luis, M.
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article
Metal-encapsulated organolead halide perovskite photocathode for solar-driven hydrogen evolution in water
Abstract
Lead-halide perovskites have triggered the latest breakthrough in photovoltaic technology. Despite the great promise shown by these materials, their instability towards water even in the presence of low amounts of moisture makes them, a priori, unsuitable for their direct use as light harvesters in aqueous solution for the production of hydrogen through water splitting. Here, we present a simple method that enables their use in photoelectrocatalytic hydrogen evolution while immersed in an aqueous solution. Field’s metal, a fusible InBiSn alloy, is used to efficiently protect the perovskite from water while simultaneously allowing the photogenerated electrons to reach a Pt hydrogen evolution catalyst. A record photocurrent density of9.8 mA cm2 at 0 V versus RHE with an onset potential as positive as 0.95±0.03V versus RHE is obtained. The photoelectrodes show remarkable stability retaining more than 80% of their initial photocurrent for B1 h under continuous illumination.