Mechanistic Insights of Electrochemical Cl2 and O2 Generation from Lanthanum Cobalt Manganese Oxide

• Published in: Advanced materials interfaces Vol. 9; no. 25
• Main Authors: Sood, Kritika, Rana, Supriya, Wadhwa, Ritika, Bhasin, Kuldeep Kumar, Jha, Menaka
• Format: Journal Article
• Language: English
• Published: Weinheim John Wiley & Sons, Inc 01-09-2022
• Subjects: Catalytic activity; Charge transfer; Chemical industry; Chlorine; chlorine evolution reaction; Cobalt compounds; Contact angle; double perovskites; Electrocatalysts; Lanthanum; Manganese; oxygen evolution reaction; Oxygen evolution reactions; Perovskites; Reaction kinetics; Wettability
• ISSN: 2196-7350; 2196-7350
• DOI: 10.1002/admi.202201138

The chlorine evolution reaction holds a core role in the chemical industries and water‐treatment plants. To overcome the high power input supplied for Cl2 generation at an industrial scale an efficient and durable electrocatalyst is always on hunt. Double perovskite oxides have been used previously for oxygen evolution reaction (OER) and have shown outstanding results on the ground of dual surface active site mechanism. Here, La2CoMnO6 (LCMO) are explored for the electrochemical Cl2 and O2 generation. The electrocatalytic studies are performed in 5 m NaCl (pH ≈ 2.2) for chlorine evolution reaction (CER) and 1 m KOH (pH = 13.5) for OER. The LCMO shows enhanced catalytic activity with onset and overpotential of 75 and 280 mV for CER. Further, the kinetics of the catalytic reaction is determined by the Tafel slope values that is calculated to be 44 mV dec−1 for CER. The interfacial charge transfer resistance value at 11 Ω tells the insight mechanism by facilitating more interaction between electrode‐electrolyte interfaces. In addition to this, wettability analysis of LCMO shows a contact angle as low as 23°. The present study paves a way for double perovskites to be used as an electro‐catalyst for the chlor‐alkali process.
Excellent electrochemical performance of lanthanum cobalt manganese oxide‐based double perovskite system towards chlorine and oxygen evolution is reported.