Graphite-protected CsPbBr3 perovskite photoanodes functionalised with water oxidation catalyst for oxygen evolution in water
Graphite-protected CsPbBr3 perovskite photoanodes functionalised with water oxidation catalyst for oxygen evolution in water
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DOI：
10.1038/s41467-019-10124-0
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发表时间：
2019-05-08
影响因子：
16.6
通讯作者：
Cameron, Petra J.
中科院分区：
文献类型：
--
作者：
Poli, Isabella;Hintermair, Ulrich;Cameron, Petra J.
金属卤化物钙钛矿由于其有前景的光电特性和基于溶液加工的廉价制造技术而在光伏领域得到了广泛的研究。在这里，我们报告了基于无机 CsPbBr3 的光阳极的开发，用于从水性电解质中直接光电化学析氧。我们使用商用导热石墨片和介孔碳支架来封装 CsPbBr3，作为一种廉价且有效的保护策略。我们在恒定的模拟太阳光照下，在水性电解质中实现了 30 小时的创纪录稳定性，在 1.23 V-RHE 下电流高于 2 mA cm(-2)。我们通过将基于铱的分子水氧化催化剂接枝到密封石墨片面向电解质的表面上，进一步证明了我们方法的多功能性，由于加速的电荷转移，该催化剂在阴极上改变了复合光电阳极的起始电位。这些结果表明了开发用于光电化学太阳能燃料发电的稳定卤化物钙钛矿基电极的有效途径。
Metal-halide perovskites have been widely investigated in the photovoltaic sector due to their promising optoelectronic properties and inexpensive fabrication techniques based on solution processing. Here we report the development of inorganic CsPbBr3-based photoanodes for direct photoelectrochemical oxygen evolution from aqueous electrolytes. We use a commercial thermal graphite sheet and a mesoporous carbon scaffold to encapsulate CsPbBr3 as an inexpensive and efficient protection strategy. We achieve a record stability of 30 h in aqueous electrolyte under constant simulated solar illumination, with currents above 2 mA cm(-2) at 1.23 V-RHE. We further demonstrate the versatility of our approach by grafting a molecular Ir-based water oxidation catalyst on the electrolyte-facing surface of the sealing graphite sheet, which cathodically shifts the onset potential of the composite photoanode due to accelerated charge transfer. These results suggest an efficient route to develop stable halide perovskite based electrodes for photoelectrochemical solar fuel generation.