Vignolo-González Hugo A, Laha Sourav, Jiménez-Solano Alberto, Oshima Takayoshi, Duppel Viola, Schützendübe Peter, Lotsch Bettina V
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.
Department of Chemistry, University of Munich (LMU), Butenandtstraße 5-13, 81377 München, Germany.
Matter. 2020 Aug 5;3(2):464-486. doi: 10.1016/j.matt.2020.07.021.
Quantitative comparison of photocatalytic performances across different photocatalysis setups is technically challenging. Here, we combine the concepts of relative and optimal photonic efficiencies to normalize activities with an internal benchmark material, RuO photodeposited on a P25-TiO photocatalyst, which was optimized for reproducibility of the oxygen evolution reaction (OER). Additionally, a general set of good practices was identified to ensure reliable quantification of photocatalytic OER, including photoreactor design, photocatalyst dispersion, and control of parasitic reactions caused by the sacrificial electron acceptor. Moreover, a method combining optical modeling and measurements was proposed to quantify the benchmark absorbed and scattered light (7.6% and 81.2%, respectively, of = 300-500 nm incident photons), rather than just incident light (≈AM 1.5G), to estimate its internal quantum efficiency (16%). We advocate the adoption of the instrumental and theoretical framework provided here to facilitate material standardization and comparison in the field of artificial photosynthesis.
对不同光催化装置的光催化性能进行定量比较在技术上具有挑战性。在此，我们结合相对光子效率和最佳光子效率的概念，使用内部基准材料（光沉积在P25-TiO₂光催化剂上的RuO₂，该光催化剂针对析氧反应（OER）的重现性进行了优化）对活性进行归一化。此外，还确定了一套通用的良好做法，以确保对光催化OER进行可靠的定量，包括光反应器设计、光催化剂分散以及对牺牲电子受体引起的寄生反应的控制。此外，还提出了一种结合光学建模和测量的方法，以量化基准吸收光和散射光（对于波长为300 - 500 nm的入射光子，分别为7.6%和81.2%），而不仅仅是入射光（≈AM 1.5G），以估计其内部量子效率（16%）。我们提倡采用本文提供的仪器和理论框架，以促进人工光合作用领域的材料标准化和比较。
