Fig. 1

Preparation and nanostructure characterization of HNTM-Au-SA. a Schematic illustration of photosynthesis and photoelectrochemical reduction of CO2 on chlorophyll and HNTM-Au-SA, respectively. b TEM image. c STEM image (inset is line-scanning spectrum for Au element). d HRTEM image. Each rhombus represents a porphyrin unit. e HAADF STEM image. Single Au atoms are highlighted in red circles. Scale bar: b is 1 μm, c is 50 nm, d, e is 5 nm