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Iron Diboride (FeB2) for the Electroreduction of NO to NH3
Guike Zhang1, Fuzhou Wang1, Yuying Wan1
1School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
Abstract:
We report iron diboride (FeB2) as a high-performance metal diboride catalyst for electrochemical NO-to-NH3 reduction (NORR), which shows a maximum NH3 yield rate of 289.3 μmol h-1 cm-2 and a NH3-Faradaic efficiency of 93.8% at -0.4 V versus reversible hydrogen electrode. Theoretical computations reveal that Fe and B sites synergetically activate the NO molecule, while the protonation of NO is energetically more favorable on B sites. Meanwhile, both Fe and B sites preferentially absorb NO over H atoms to suppress the competing hydrogen evolution.
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