Synthesis of efficient cobalt carbonate nanosheets based on DES for oxygen evolution reaction
Hydrogen energy is considered as one of the most effective energy vectors to achieve carbon neutrality due to its high calorific value and clean,pollution-free characteristics.Electrolysis of water is an effective way to achieve sustainable hydrogen production.Among them,the slow kinetics of the oxygen evolution reaction(OER)leads to low water decomposition efficiency,and it is urgent to develop efficient and stable electrocatalysts.Herein,we utilize the coordination interaction between polyhydric alcohols,urea,and CoCl2·6H2O to form supramolecular ternary deep eutectic solvent(DES)systems.By employing a one-pot solvothermal method,surface-roughened two-dimensional CoCO3 nanosheets were constructed to enhance electrocatalytic OER efficiency.The impact of the number of alcohol hydroxyl groups on the morphology and performance of CoCO3was studied.The research shows that the CoCO3-Gly catalyst prepared by using a ternary DES system of glycerol,urea,and CoCl2·6H2O exhibits a more fluffy,thinner,and rougher sheet-like structure.The catalyst exhibits superior OER performance,with an overpotential of 311 mV at a current density of 10 mA·cm-2 and a current retention rate of 99％after 24 h of stability testing.
deep eutectic solventscobalt carbonatecatalystelectrocatalysisoxygen evolution reactionpolyhydric alcohols
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