Iron Diboride (FeB₂) for the Electroreduction of NO to NH₃

Abstract

We report iron diboride (FeB 2 ) as a high-performance metal diboride catalyst for electrochemical NO-to-NH 3 reduction (NORR), which shows a maximum NH 3 yield rate of 289.3 μmol h −1 cm −2 and a NH 3 -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.

Unveiling the Roles of Alloyed Boron in Hexavalent Chromium Removal Using Borohydride-Synthesized Nanoscale Zerovalent Iron: Electron Donor and Antipassivator

“…LCF results for Fe K-edge XANES-normalized spectra of (a,c) B-NZVI 100 and (b,d) C-NZVI 100A (a,b) before and (c,d) after Cr­(VI) removal. (e) Fourier transform (FT) of the Fe K-edge EXAFS spectra of pristine and reacted B-NZVI 100 and C-NZVI 100A and relative references (The spectrum of FeB 2 were reproduced with permission from ref Copyright 2023, American Chemical Society). Wavelet transform (WT) of the Fe K-edge EXAFS data of (f,h) B-NZVI 100 and (g,i) C-NZVI 100A (f,g) before and (h,i) after Cr­(VI) removal.…”

Electrocatalytic NO reduction to NH3 over TiS2 nanosheets

“…17 However, the complicated five-electron transfer reaction and the intense HER seriously compromise the NORR efficiency 18–23 , and thus exploring high-performing electrocatalysts for simultaneously boosting the NORR and suppressing the HER is of high importance. 24–28…”

“…17 However, the complicated fiveelectron transfer reaction and the intense HER seriously compromise the NORR efficiency [18][19][20][21][22][23] , and thus exploring highperforming electrocatalysts for simultaneously boosting the NORR and suppressing the HER is of high importance. [24][25][26][27][28] Currently, many noble metals and cost-effective transition metal compounds are extensively developed towards the NORR. [29][30][31][32][33][34] Among them, transition metal sulfides (TMSs) are most attractive for the NORR due to their layered morphology, tunable electronic structure, high chemical stability and low cost.…”