当前位置：
X-MOL 学术
›
Chem. Sci.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Operando deconvolution of photovoltaic and electrocatalytic performance in ALD TiO2 protected water splitting photocathodes†
Chemical Science ( IF 7.6 ) Pub Date : 2018-06-05 00:00:00 , DOI: 10.1039/c8sc01453a Wei Cui 1 , Wenzhe Niu 1, 2 , René Wick-Joliat 1 , Thomas Moehl 1 , S David Tilley 1
Chemical Science ( IF 7.6 ) Pub Date : 2018-06-05 00:00:00 , DOI: 10.1039/c8sc01453a Wei Cui 1 , Wenzhe Niu 1, 2 , René Wick-Joliat 1 , Thomas Moehl 1 , S David Tilley 1
Affiliation
|
In this work, we demonstrate that buried junction photocathodes featuring an ALD TiO2 protective overlayer can be readily characterized using a variation of the dual working electrode (DWE) technique, where the second working electrode (WE2) is spatially isolated from the hydrogen-evolving active area. The measurement of the surface potential during operation enables the operando deconvolution of the photovoltaic and electrocatalytic performance of these photocathodes, by reconstructing J–ΔV curves (reminiscent of photovoltaic J–V curves) from the 3-electrode water splitting data. Our method provides a clearer understanding of the photocathode degradation mechanism during stability tests, including loss of the catalyst from the surface, which is only possible in our isolated WE2 configuration. A pn+Si/TiO2 photocathode was first investigated as a well behaved model system, and then the technique was applied to an emerging material system based on Cu2O/Ga2O3, where we uncovered an intrinsic instability of the Cu2O/Ga2O3 junction (loss of photovoltage) during long term stability measurements.
中文翻译：
ALD TiO2 保护的水分解光电阴极中光伏和电催化性能的操作解卷积†
在这项工作中，我们证明了具有 ALD TiO 2保护层的掩埋结光电阴极可以使用双工作电极 (DWE) 技术的变体轻松表征，其中第二工作电极 (WE2) 与析氢电极在空间上隔离。活动区域。通过从 3 电极水分解数据重建J –Δ V曲线（让人想起光伏J – V曲线），运行过程中表面电势的测量可以对这些光电阴极的光伏和电催化性能进行操作解卷积。我们的方法可以更清楚地了解稳定性测试期间的光电阴极降解机制，包括表面催化剂的损失，这只有在我们的隔离 WE2 配置中才有可能实现。首先研究了 pn + Si/TiO 2光电阴极作为性能良好的模型系统，然后将该技术应用于基于 Cu 2 O/Ga 2 O 3的新兴材料系统，我们发现了 Cu 2的内在不稳定性长期稳定性测量期间的 O/Ga 2 O 3结（光电压损失）。
更新日期：2018-06-05
中文翻译：
ALD TiO2 保护的水分解光电阴极中光伏和电催化性能的操作解卷积†
在这项工作中，我们证明了具有 ALD TiO 2保护层的掩埋结光电阴极可以使用双工作电极 (DWE) 技术的变体轻松表征，其中第二工作电极 (WE2) 与析氢电极在空间上隔离。活动区域。通过从 3 电极水分解数据重建J –Δ V曲线（让人想起光伏J – V曲线），运行过程中表面电势的测量可以对这些光电阴极的光伏和电催化性能进行操作解卷积。我们的方法可以更清楚地了解稳定性测试期间的光电阴极降解机制，包括表面催化剂的损失，这只有在我们的隔离 WE2 配置中才有可能实现。首先研究了 pn + Si/TiO 2光电阴极作为性能良好的模型系统，然后将该技术应用于基于 Cu 2 O/Ga 2 O 3的新兴材料系统，我们发现了 Cu 2的内在不稳定性长期稳定性测量期间的 O/Ga 2 O 3结（光电压损失）。
京公网安备 11010802027423号