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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.