Water photolysis at 12.3% efficiency via perovskite photovoltaics and Earth-abundant catalysts
Water photolysis at 12.3% efficiency via perovskite photovoltaics and Earth-abundant catalysts
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DOI：
10.1126/science.1258307
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发表时间：
2014-09-26
期刊：
影响因子：
56.9
通讯作者：
Graetzel, Michael
中科院分区：
文献类型：
--
作者：
Luo, Jingshan;Im, Jeong-Hyeok;Graetzel, Michael
虽然阳光驱动的水分解是可持续氢燃料生产的一种有前途的途径，但由于必要的光伏和光电化学设备的费用，广泛的实施受到阻碍。在这里，我们描述了一种高效、低成本的水裂解电池，它结合了最先进的溶液处理钙钛矿串联太阳能电池和双功能地球丰富催化剂。NiFe层状双氢氧化物催化电极在碱性电解液中对析氧和析氢反应都表现出很高的活性。两者的结合产生了大约每平方厘米10毫安的水分解光电流密度，相当于12.3%的太阳能转化为氢的效率。目前，钙钛矿的不稳定性限制了电池的寿命。
Although sunlight-driven water splitting is a promising route to sustainable hydrogen fuel production, widespread implementation is hampered by the expense of the necessary photovoltaic and photoelectrochemical apparatus. Here, we describe a highly efficient and low-cost water-splitting cell combining a state-of-the-art solution-processed perovskite tandem solar cell and a bifunctional Earth-abundant catalyst. The catalyst electrode, a NiFe layered double hydroxide, exhibits high activity toward both the oxygen and hydrogen evolution reactions in alkaline electrolyte. The combination of the two yields a water-splitting photocurrent density of around 10 milliamperes per square centimeter, corresponding to a solar-to-hydrogen efficiency of 12.3%. Currently, the perovskite instability limits the cell lifetime.