Freeze-thaw made noble metal aerogels: Clean and hierarchical materials for photoelectrocatalysis

Noble metal aerogels are widely investigated for electrocatalysis applications due to their large specific surface areas and the high catalytic activity of noble metals. However, their fabrication methods are cumbersome. Now though, researchers have developed a freeze?thaw method capable of preparing various hierarchically structured noble metal gels within only one day directly from dilute solutions without extra additives. The method fits various noble metals, and multi-scale structures can be obtained across nanometer and micrometer scales.