Neodymium‐Doped IrO 2 Electrocatalysts Supported on Titanium Plates for Enhanced Chlorine Evolution Reaction Performance

Abstract The chlorine evolution reaction (CER) is extensively used in disinfection, chlorine products, and water treatment. However, CER catalysts based on noble metals are expensive, limiting their industrial application. For the purpose of enhancing the CER performance with low usage of Ir, Nd‐doped IrO 2 electrocatalysts supported on Ti plates were fabricated by using the sol‐gel method. The optimal Ti/Ir 0.8 Nd 0.2 O x electrode exhibited excellent CER performance with a low potential of 1.52 V vs. RHE at 100 mA cm −2 and a great stability of over 210 h in 5 M NaCl solution. Notably, the mass activity of Ti/Ir 0.8 Nd 0.2 O x (96.5 A g Ir −1 at 1.5 V vs RHE) was twice as high as that of Ti/IrO 2 , which was the highest among noble metal electrodes reported. Density functional theory calculations indicated that the doping of Nd could clearly decrease the loss of Gibbs free energy for the rate‐determining step (desorption of chlorine).