Figure 5.
NO3RR performance evaluation of dense MnO2/MXene
In 0.5 M K2SO4 and 0.1 M KNO3 at −1.0 V vs. RHE: (A) concentration-time curves of the NO3−, NO2−, and NH3 in NO3RR for 8 h; and (B) the corresponding and yield rate and FE of NH3 in NO3RR for 8 h; (C) the logarithmic relationship between time and consumed NO3− concentration during NO3RR for 8 h. FE and yield rate of NH3 in (D) 0.5 M K2SO4 and 0.1 M KNO3 solution with different pH; and in (E) 0.5 M K2SO4 solution with different concentrations of NO3−; (F) cyclic stability test with refreshing the electrolyte on FE and yield rate of NH3 in 0.5 M K2SO4 and 0.1 M KNO3, (1 cycle/1 h); and (G) performance comparison of different reported Mn-based and MXene-based catalysts for NO3RR to NH3 production in neutral electrolyte (See detailed information in Table S3, supplemental information).