Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK.
Department of Physics, University of Cambridge, Cambridge CB3 OHE, UK.
Nat Commun. 2016 Sep 6;7:12555. doi: 10.1038/ncomms12555.
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.
卤铅钙钛矿引发了光伏技术的最新突破。尽管这些材料显示出巨大的潜力，但即使在低湿度的情况下，它们对水的不稳定性使得它们在水分解生产氢气的水溶液中，不能直接用作光收集器。在这里，我们提出了一种简单的方法，使它们能够在浸入水溶液的情况下用于光电催化析氢。场金属，即可熔的 InBiSn 合金，可有效地保护钙钛矿免受水的侵害，同时允许光生电子到达 Pt 析氢催化剂。在相对于 RHE 为 0V 的情况下，获得了-9.8 mA cm(-2)的记录光电流密度，起始电位高达 0.95±0.03 V 相对于 RHE。光电电极在连续光照下表现出显著的稳定性，初始光电流保留超过 80%，持续约 1 小时。
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