Recently, many novel thermoelectric materials have been reported with ultra-high performance. However, some of them (e.g., Cu/Ag-based liquid-like materials) possess low thermodynamic stability. Here, we successfully achieve both good stability and high efficiency in a thermoelectric module based on highperformance liquid-like materials through tuning the geometry of the legs to ensure the voltage applied on the liquid-like materials is below their threshold for stable usage. This work accelerates the development of liquid-like thermoelectric materials for high-efficiency modules in real applications.

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