Development of oxygen-deficient metal oxide coatings as high-performance OER electrodes in electrochemical water splitting via liquid feedstock plasma spraying technique

Wednesday, May 24, 2023: 5:10 PM
303A (Quebec City Convention Centre)
Dr. Zexin Yu , University of Stuttgart, Stuttgart, Germany, Soochow University, Suzhou, China
Mr. Botong Wang , Soochow University, Suzhou, China, National Engineering Laboratory for Modern Materials Surface Engineering Technology; The Key Lab of Guangdong for Modern Surface Engineering Technology; Guangdong Institute of New Materials, China, Guangzhou, China
Prof. Andreas Killinger , University of Stuttgart, Stuttgart, Germany
Mr. Christian Semmler , University of Stuttgart, Stuttgart, Germany
Dr. Taika Liu , National Engineering Laboratory for Modern Materials Surface Engineering Technology; The Key Lab of Guangdong for Modern Surface Engineering Technology; Guangdong Institute of New Materials, China, Guangzhou, China
Dr. Venancio Martínez García , University of Stuttgart, Stuttgart, Germany
Ms. Longen Gui , Guangdong Institute of New Materials, Guangzhou, China, Soochow University, Suzhou, China
Electrochemical water splitting is a green way to produce hydrogen. Particularly, the dynamic sluggish oxygen evolution reaction (OER) in anode play the critical role in the final performance. Defects engineering and straining engineering are recently optimization strategies for OER electrodes, while the combined benefitting from two aspects for OER electrodes are rarely studied. In particular, thanks to liquid feedstock plasma spraying (LFPS) technique, the oxygen vacancies and residual strain were in-situ introduced during deposition procedures without any post-treatment. In this work, several metal oxide samples under different deposition conditions were elaborated and characterized, which were used to study the effect the spraying parameters on the density of oxygen vacancies and the degree of residual strain. The LFPS-deposited OER coatings exhibited Tafel slope of 34 mV/dec with overpotential of 224 mV (for 10 mA/cm2) and at least 10 h durable OER activity. The novel and simple fabrication method and the high performance of the herein developed electrodes render them quite promising for technological water splitting systems.
See more of: Renewable Energies and Storage
See more of: Thermal Spray Applications