@misc{IndraMenezesDasetal., author = {Indra, Arindam and Menezes, Prashanth W. and Das, Chittaranjan and G{\"o}bel, Caren and Tallarida, Massimo and Schmeißer, Dieter and Driess, Matthias}, title = {A facile corrosion approach to the synthesis of highly active CoOxwater oxidation catalysts}, series = {Journal of Materials Chemistry A}, journal = {Journal of Materials Chemistry A}, number = {5}, issn = {2050-7488}, doi = {10.1039/c6ta10650a}, pages = {5171 -- 5177}, abstract = {Ultra-small rock salt cobalt monoxide (CoO) nanoparticles were synthesized and subjected to partial oxidation ('corrosion') with ceric ammonium nitrate (CAN) to form mixed-valence CoOx(1 < x< 2) water oxidation catalysts. Spectroscopic, microscopic and analytical methods evidenced a structural reformation of cubic CoO to active CoOx with a spinel structure. The superior water oxidation activity of CoOx has been established in electrochemical water oxidation under alkaline conditions. Electrochemical water oxidation with CoOx was recorded at a considerably low overpotential of merely 325 mV at a current density of 10 mA cm-2 in comparison to 370 mV for CoO. Transformation of both octahedral CoII and CoIII sites into amorphous Co(OH)2-CoOOH is the key to high electrochemical activity while the presence of a higher amount of octahedral CoIII sites in CoOx is imperative for an efficient oxygen evolution process.}, language = {en} }