fig4

Figure 4. (A) LSV curves of CeO₂ in a 0.5 M Na₂SO₄ electrolyte with and without $$\mathrm{NO}_{3}^{-}$$. (B) Calibration curve used for estimation of ammonia-N concentration. (C-E) are potential-dependent FE_NH3 and Yield_NH3 over CeO₂-CTAB0.5, CeO₂-CTAB1.0 and CeO₂-CTAB2.0. (F) The cyclic stability test of CeO₂-CTAB2.0 at -1.05 V.