Fig. 6. The plasmonic photothermal catalytic RWGS reaction over Al/Al₂O₃/Cu₂O antenna-reactor nanoparticles. (a) A HRTEM image of Al/Al₂O₃/Cu₂O. (b) The spatial temperature distribution on the surface of the catalyst under light irradiation. (c) A comparison of the overall rates of product formation under purely light-driven and thermal-driven conditions. (d) Apparent external quantum efficiency (EQE) plotted against photon flux. (e) Apparent external quantum efficiency (EQE) plotted against illumination wavelength. (f) Gas chromatograms of the chamber output during solar- and thermal-driven processes on Al@Cu₂O. (g) The proposed mechanism of using Al@Cu₂O for plasmon-mediated charge transfer and adsorbate activation processes. (h) A schematic illustration of hot electron-driven RWGS over Al@Cu₂O plasmonic photothermal catalysts. (a–h) Reproduced from ref. 50 with permission from Springer Nature, Copyright 2017.