Fig. 3: Electrochemical performances of the atomically isolated asymmetric Ni–O–Ti sites.
From: Highly selective urea electrooxidation coupled with efficient hydrogen evolution
a LSV curves with 85% iR correction and (b) Tafel plots of the atomically isolated asymmetric Ni–O–Ti sites and connected symmetric Ni–O–Ni sites on Ti foam in 1.0 M KOH containing 0.33 M urea with a stirring rate of 500 rpm and 5 mV s–1. Freestanding Ti foam and Ni foam were used for comparison. The solution resistance is 2.1 ± 0.1 Ω. c The UOR selectivity of asymmetric Ni–O–Ti sites, symmetric Ni–O–Ni sites, and Ni foam as a function of the applied potential. Error bars represent the standard deviations derived from three distinct samples. d On-line MS for asymmetric Ni–O–Ti sites in 1.0 M KOH with 0.1 M CO(14NH2)2 and 0.1 M CO(15NH2)2. e The current density changes of asymmetric Ni–O–Ti sites after the introduction of 0.1 M NCO– and 0.1 M NO2– in 1.0 M KOH containing 0.33 M urea electrolyte. f Chronoamperometry measurements with the initial current density of 100 mA cm–2 in 1.0 M KOH containing 1.0 M urea, and the solution resistance is 2.0 ± 0.1 Ω.
