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 of −9.8 mA cm−2 at 0 V versus RHE with an onset potential as positive as 0.95±0.03 V versus RHE is obtained. The photoelectrodes show remarkable stability retaining more than 80% of their initial photocurrent for ∼1 h under continuous illumination.
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机译：卤化钙钛矿已经触发了光伏技术的最新突破。尽管这些材料显示出巨大的前景，但它们即使在少量水分的情况下也对水不稳定，这使其先验地不适用于直接用作水溶液中的光收集器，以通过水分解生产氢。在这里，我们介绍一种简单的方法，使它们在浸入水溶液中的同时也可用于光电催化制氢。 Field的金属，一种易熔的InBiSn合金，用于有效保护钙钛矿免受水的侵害，同时使光生电子到达Pt析氢催化剂。相对于RHE，在0 V时记录的光电流密度为-9.8 mA cm −2 ，相对于RHE，起始电位为正，为0.95±0.03V。在连续照明下，光电极表现出显着的稳定性，在约1 h的时间内可保持其初始光电流的80％以上。
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