Spectral-Kinetic Synergy in Au-Network Engineered FeTiO3: A Multi-Field Coupling Strategy for Lunar In Situ Resource Utilization.

Currently, in situ lunar resource utilization faces two major challenges: traditional photocatalysts cannot effectively absorb and utilize infrared spectra, and there is severe kinetic inhibition. To address this challenge, this paper proposes a pioneering 'spectral-kinetic synergy' strategy, constructing a unique Au-network engineered ilmenite (AuL-FeTiO3) architecture. This network topology transforms the catalyst into a "photo-thermal-electric" multi-field coupling platform. The reticulated Au architecture functions as a dual-mode amplifier: it generates a local electromagnetic field orders of magnitude stronger than that of conventional nanoparticles via Localized Surface Plasmon Resonance (LSPR), driving the production of energetic hot electrons; simultaneously, it efficiently harvests broadband infrared light to establish a localized thermal field. Crucially, in situ characterization enables us to visualize and decouple the distinct dynamics of thermally driven lattice electrons vs. plasmonic hot electrons. The study revealed that the local thermal field acts as a "kinetic promoter," facilitating the injection of a large number of LSPR-derived hot electrons into the Au-FeTiO3 interface. This mechanism significantly extends carrier lifetime and accelerates interfacial charge transfer kinetics. Crucially, this structure drives efficient photothermal CO2 reduction. This work not only elucidates the collaborative mechanism of spectral-kinetic coupling but also provides a transformative blueprint for designing high-performance catalysts using indigenous lunar materials.