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Bridging Mo₂C–C and highly dispersed copper by incorporating N-functional groups to greatly enhance the catalytic activity and durability for carbon dioxide hydrogenation

Xiong, Kun, Zhou, Guilin, Zhang, Haidong, Shen, Yu, Zhang, Xianming, Zhang, Yuhua, Li, Jinlin
Journal of materials chemistry 2018 v.6 no.32 pp. 15510-15516
adsorption, carbon dioxide, catalysts, catalytic activity, copper, durability, electron transfer, hydrogen, hydrogenation, molybdenum
In this work, we report a facile and controllable method to enhance the catalytic activity and stability of Mo₂C–C for CO₂ hydrogenation by incorporating N-functional groups on the interface of Mo₂C–C to simultaneously serve as basic sites for improving CO₂ chemisorption and to immobilize copper particles to prevent aggregation. The incorporated N changed the surface chemical environment of Mo₂C and Cu, resulting in the coexistence of Cu²⁺/Cu⁺/Cu⁰ and electron transfer from the copper to the molybdenum species (via MoOₓCy–□–Cu⁺/Cu⁰). The strong coupling effects of N, Mo₂C, and Cu on Cu–Mo₂C–N–C is beneficial for further enhancing the adsorption and activation of CO₂ and H₂ molecules. Accordingly, the Cu–Mo₂C–N–C catalysts exhibit greatly superior catalytic activity and stability toward CO₂ hydrogenation compared with other catalysts. This facile method may be extended to other materials-based interface engineering to fabricate efficient CO₂ hydrogenation catalysts.