Phase‐engineered NiFe ‐ NiIn dual alloy catalysts for enhanced low‐temperature reverse water‐gas shift reaction

Abstract The reverse water gas shift (RWGS) efficiently mitigates CO 2 emissions and produces syngas, but the low‐temperature activity‐selectivity trade‐off persists. Herein, a novel NiFe‐NiIn‐X dual‐phase alloy catalyst was fabricated via high‐temperature reduction of LDH precursors with phase engineering to boost RWGS. Unlike single‐phase NiFe or NiIn, this phase‐engineered dual‐alloy nanostructure effectively isolates Ni sites, forms a heteroalloy interface, and promotes charge transfer among Ni, Fe, and In. This enhances CO 2 adsorption and activation and weakens H* and CO* adsorption, suppressing methane and promoting CO. At 300°C and ambient pressure, optimized NiFe‐NiIn‐0.2 exhibited 15.1% CO 2 conversion, 98.9% CO selectivity, and stable operation over 100 h. This study illustrates how phase engineering of LDH‐derived alloys can effectively decouple the low‐temperature activity‐selectivity trade‐off in the RWGS reaction, providing a promising strategy for the rational design of low‐temperature RWGS catalysts.