Synergistic Effect of Electric Field on Cs Doped Co₃O₄ for Low-Temperature Efficient Decomposition of N₂O

To address the challenge of low-temperature efficient nitrous oxide （N₂O） removal from the complex exhaust of ammonia-fueled internal combustion engines， a novel strategy was proposed for the low-temperature efficient catalytic decomposition of N₂O through the synergistic effect of electric field on Cs-doped Co₃O₄. A series of Co₃O₄ catalysts with varying Cs doping levels were synthesized via the citrate complexation method and coupled with SiC support. It was found that the decomposition temperature of N₂O was significantly reduced under the application of an electric field. The Cs_0.1–Co₃O₄/SiC catalyst achieved complete decomposition of N₂O at 125 ℃ with a space velocity of 90 000 h^-1. Mechanistic studies have revealed that Cs， as an electron promoter， can construct an efficient electron transfer interface of Cs–Co³⁺/Co²⁺ when doped in moderation. It not only enhances the concentration of Co²⁺ sites on the catalyst surface but also improves the mobility of lattice oxygen， thereby forming more O_V（oxygen vacancy）–Co²⁺ active centers. Under the influence of an electric field， the aforementioned electron-donating effect of Cs is further intensified， accelerating the redox cycle process of N₂O decomposition and ultimately driving the breakage of N—O bonds and efficient dissociation of N₂O at low temperatures.