Chem. Commun., 2025, Accepted Manuscript DOI: 10.1039/D5CC04133C, Highlight Bin Xie, Mingyu Li, Chengzhi Chen, Guangming Chen, Zhuoxin Liu Thermocells (TECs) represent a promising technology for sustainable low-grade waste heat (<100 °C) harvesting, offering distinct advantages such as scalability, structural versatility, and high thermopower. However, their practical applications are...