Transient absorption studies of TiO 2 and TiO 2 –reduced graphene oxide composites Iona Hill ¹, Georgios Arvanitakis¹, Maria Tesa¹, Kiem Giap Nguyen², Tariq Sajjad², Suela Kellici² ¹Edinburgh Instruments Ltd, 2 Bain Square, Kirkton Campus, Livingston, EH54 7DQ, UK, ²London Centre for Energy Engineering (LCEE), School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK Titanium dioxide (TiO 2 ) is a widely studied photocatalyst for solar fuel applications such as CO 2 reduction and water splitting. 1 However, its efficiency is limited by rapid electron-hole recombination. Incorporating reduced graphene oxide (rGO) into TiO 2 can enhance photocatalytic activity by improving charge separation and facilitating electron transport. In this work, we investigate the influence of varying rGO content in TiO 2 composites using transient absorption (TA) spectroscopy. TA enables real-time observation of photogenerated charge carriers and excited-state dynamics. Measurements were carried out using Edinburgh Instruments’ LP980 spectrometer, which combines spectral (from 220 nm to 2.5 µm) and kinetic (from nanoseconds to seconds) TA measurements in one spectrometer, using an ICCD camera and PMT, respectively. We present spectral and kinetic TA data highlighting how increasing rGO concentration affects charge carrier lifetimes and recombination dynamics, offering insights into the enhanced photocatalytic performance of the
composites. References 1. S. Kellici et al. , J. Mater. Chem. A , 2023 , 11 , 9791–9806.
P40
© The Author(s), 2025
Made with FlippingBook Learn more on our blog