Fig. 3. Electrocatalytic performance in NIRR.

a LSV curves of Ti FP and titanium hydride with and without NO₃⁻ (without iR compensation). b NH₃ yields and FEs for titanium hydride against various work potentials in 1 M KOH solution with 0.1 M NO₃⁻ (without iR compensation). c NH₃ yields and FEs for titanium hydride at different concentrations of NO₃⁻ (without iR compensation). d Stability test at − 0.7 V vs. RHE (without iR compensation) with periodic updates taken every 3 h. e The time-dependent concentration change of NO₃⁻-N, NO₂⁻-N and NH₃-N (without iR compensation). f Comparison of the NIRR performance of the titanium hydride with the reported electrocatalyst (The nitrate concentrations of these reports were equal to 0.1 M). The NH₃ yields and FEs are calculated once per hour. Error bars indicate there lative standard deviations of the mean (n = 3).