Fig. 2: Evaluation of electrocatalytic performances toward urea synthesis.
From: Ligand engineering towards electrocatalytic urea synthesis on a molecular catalyst
a Urea yield rates, (b) Faradaic efficiencies and (c) Partial current densities for urea synthesis of CuPc-Amino and CuPc at various applied potentials. d Electrochemical stability tests on CuPc-Amino and CuPc at −1.6 V versus RHE. Electrochemical measurements were performed without iR compensation. The error bars represent the standard deviation for three independent measurements. All measurements were performed in a H-cell at 25 °C, the electrolyte for electrochemical C−N coupling is CO2-saturated 0.1 M KHCO3 and 0.05 M KNO3 (pH = 6.8 ± 0.03), and the catalyst loading is 0.2 mg cm−2. The cathodic chamber was continuously purged with high-purity CO2 with a flow rate of 30 mL min–1 and stirred at a rotation rate of 500 r.p.m. during the electrocatalytic process.
