Improvement in Cobalt Phosphate Electrocatalyst Activity Toward Oxygen Evolution from Water by Glycine Molecule Addition and Functional Details

Kanta YAMADA, Tomoki HIUE, Toshiaki INA, Kehsuan WANG, Hiroshi KONDOH, Yoshihisa SAKATA, Yuh-Lang LEE, Takeshi KAWAI, Masaaki YOSHIDA
2019 Analytical Sciences  
Electrochemical water splitting using renewable energy shows promise for the development of sustainable hydrogen production methods. The process requires a highly active electrocatalyst for oxygen evolution to improve the overall water splitting efficiency. The present study showed that oxygen evolution improved dramatically upon the addition of glycine to cobalt phosphate, when the glycine was added to the electrolyte solution during electrodeposition. The functionality of the organic
more » ... he organic molecules was investigated using in situ UV-vis absorption, in situ X-ray absorption fine structure, and in situ infrared (IR) absorption spectroscopy in the attenuated total reflection mode. The results demonstrated that the glycine molecules assembled cobalt oxide clusters composed of CoO6 (CoOOH) octahedrons a few nanometers in diameter upon the electrodeposition of cobalt catalysts. This suggests that the cobalt-glycine catalyst can decompose water to oxygen gas efficiently, because the number of cobalt oxide clusters increased as active reaction sites upon the addition of glycine molecules.
doi:10.2116/analsci.19sap08 pmid:31761817 fatcat:zz7ywbm3hnfbjp72ungrzdn4a4