Comprehensive Evaluation for Protective Coatings: Optical, Electrical, Photoelectrochemical, and Spectroscopic Characterizations
Comprehensive Evaluation for Protective Coatings: Optical, Electrical, Photoelectrochemical, and Spectroscopic Characterizations
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DOI：
10.3389/fenrg.2021.799776
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Xin Shen;Rito Yanagi;D. Solanki;Haoqing Su;Zhaohan Li;C. Xiang;Shu Hu
中科院分区：
文献类型：
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作者：
Xin Shen;Rito Yanagi;D. Solanki;Haoqing Su;Zhaohan Li;C. Xiang;Shu Hu
许多有效的半导体在含水电解质中不稳定。因此，开发了利用保护涂层的策略来保护这些光吸收剂免受腐蚀，同时协同改善电荷分离和反应动力学。最近，各种光电化学（PEC）保护涂层已被报道具有合适的电子性能，以确保低的电荷传输损失，并揭示基本的光吸收效率。然而，研究保护涂层的关键品质因数的协议尚未建立。为此，我们提出了四个标准来评估PEC水裂解保护涂层的性能：稳定性，导电性，光学透明度和能量匹配。然后，我们提出了一个流程图，总结了用于量化这四个性能指标的推荐测试协议。特别是，我们制定了逐步测试协议，以评估在半导体/涂层/（催化剂）/液体界面的能量匹配。最后，我们提供了一个展望未来的基准涂料的需求。
Numerous efficient semiconductors suffer from instability in aqueous electrolytes. Strategies utilizing protective coatings have thus been developed to protect these photoabsorbers against corrosion while synergistically improving charge separation and reaction kinetics. Recently, various photoelectrochemical (PEC) protective coatings have been reported with suitable electronic properties to ensure low charge transport loss and reveal the fundamental photoabsorber efficiency. However, protocols for studying the critical figures of merit for protective coatings have yet to be established. For this reason, we propose four criteria for evaluating the performance of a protective coating for PEC water-splitting: stability, conductivity, optical transparency, and energetic matching. We then propose a flow chart that summarizes the recommended testing protocols for quantifying these four performance metrics. In particular, we lay out the stepwise testing protocols to evaluate the energetics matching at a semiconductor/coating/(catalyst)/liquid interface. Finally, we provide an outlook for the future benchmarking needs for coatings.