Proceedings of Catalyst Design Strategies for Photo- and Electrochemical Fuel Synthesis (ECAT25)
Publication date: 19th December 2024
Halide perovskite (HaP) solar cells, known for their high voltage efficiency (>70%) and a conduction band minimum with low electron affinity, hold significant potential as photocathodes for cost-effective solar fuel generation. However, their instability in aqueous environments, where they readily dissolve, poses a formidable challenge. To mitigate this, ultrathin Al2O3 layers (< 10 nm), applied via atomic layer deposition, serve as protective barriers against water penetration, albeit with the drawback of electronic insulation. To facilitate selective electron transport through these insulating encapsulation layers, linear conjugated organic molecules, termed "molecular relays," are incorporated in the ultrathin Al2O3 layers. The electronic properties of these molecular relays are verified through conductive probe atomic force microscopy, energy level alignment analysis, and photo-electrodeposition of metal particles (Pt and Ag). Furthermore, a feasibility study of utilizing this composite structure for CO2 reduction was conducted, leveraging the unique characteristics of bromide perovskite-based photoelectrodes. Encapsulated HaP photoelectrodes, when immersed in CO2-saturated aqueous electrolytes, demonstrated a photocurrent of approximately 100 µA/cm² at around -0.32 V versus Ag/AgCl. This work presents a robust approach to enhance the stability of HaP materials in polar, protonic electrolytes, paving the way for their application as photoelectrodes in solar fuel production.
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