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- Title
High Efficiency Electrochemical Nitrogen Fixation Achieved with a Lower Pressure Reaction System by Changing the Chemical Equilibrium.
- Authors
Cheng, Hui; Cui, Peixin; Wang, Fangrui; Ding, Liang‐Xin; Wang, Haihui
- Abstract
We demonstrate a simple and effective chemical equilibrium regulation strategy to improve the efficiency of electrochemical ammonia synthesis by constructing electrochemical reaction system that works at significantly lower pressure than the Haber–Bosch process. Transferring the nitrogen reduction reaction from ambient conditions to a lightly pressurized environment not only accelerates the activation of the N≡N triple bond but also inhibits the competing reaction of hydrogen evolution while promoting the dissolution and diffusion of nitrogen. The verification experiment of using well‐designed Fe3Mo3C/C composite nanosheets as the nitrogen reduction catalyst shows that the lower pressure reaction system can improve the Faradaic current efficiency by one order of magnitude. Moreover, the comparatively low‐pressure reaction system can greatly reduce the cell voltage of the ammonia synthesis reaction (up to 33 %) even at the relatively low pressure of 0.7 MPa, which is of significance for decreasing the energy consumption of electrochemical ammonia synthesis under mild conditions.
- Subjects
CHEMICAL equilibrium; CHEMICAL systems; NITROGEN fixation; HABER-Bosch process; FARADAIC current; HYDROGEN evolution reactions
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 43, p15687
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201910658