Electrochromic Building Energy‐Saving Device Coupling Photothermal Conversion and Radiative Cooling

The promising prospects for all‐day building thermal management are driving widespread research into spectrally selective manipulation materials. This article first summarizes the evolution path of metal reversible deposition technology, noting its advantages of cost‐effectiveness and scientific rigor. It then highlights the groundbreaking work by Wang et al. (published in ACS Energy Letters , 2025, 10, 3231) on coupling metastructured photothermal conversion electrodes and reversible Cu deposition for all‐day energy management. Finally, the commercial viability of Wang et al.'s approach for building energy saving and its potential applicability to other scenarios are elaborated.