Zhu Kaijian, Einhaus Lisanne M, Mul Guido, Huijser Annemarie
PhotoCatalytic Synthesis Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede 7500 AE, The Netherlands.
ACS Appl Mater Interfaces. 2024 Jan 31;16(4):5217-5224. doi: 10.1021/acsami.3c09566. Epub 2024 Jan 18.
In the present study, we investigate the effects of the applied external potential on a dye-sensitized NiO photocathode by time-resolved photoluminescence and femtosecond transient absorption spectroscopy under operating conditions. Instead of the anticipated acceleration of photoinduced hole injection from dye into NiO at a more negative applied potential, we observe that both hole injection and charge recombination are slowed down. We cautiously assign this effect to a variation in OH ion concentration in the inner Helmholtz plane of the electrochemical double layer with applied potential, warranting further investigation for the realization of efficient solar fuel devices.
在本研究中，我们通过时间分辨光致发光和飞秒瞬态吸收光谱，在工作条件下研究了施加的外部电势对染料敏化NiO光阴极的影响。与预期的在更负的施加电势下光致空穴从染料注入NiO的加速情况相反，我们观察到空穴注入和电荷复合均减慢。我们谨慎地将这种效应归因于电化学双层内亥姆霍兹平面中OH离子浓度随施加电势的变化，这为实现高效太阳能燃料装置的进一步研究提供了依据。
