| Increasing energy demands and environment awareness have promoted extensive research on the development of alternative energy conversion with high effciency and environmental friendliness.Among them,electrocatalytic water splitting is very appealing,and is receiving more and more attention.The critical challenge of this renewable-energy technology is to expedite the oxygen evolution reaction?OER?because of its slow kinetics and large overpotential.Therefore,developing effcient electrocatalysts with high catalytic activities is of great importance for high-performance water splitting.Cobalt-based materials are considered as promising catalysts for water oxidation due to their rich resources and high activity.The first catalyst is obtained by calcining Co-DMB at high temperature?550?in air?,A low overpotential of 302 mV?1.532V vs.RHE?is required to drive an OER current density of 10 mA·cm-2 on a simple glassy carbon?GC?working electrode in a 1.0 M KOH aqueous solution.The corresponding Tafel slope was measured to be 53 mV·dec-1.The electrode can work stably for at least 20 h at a constant potential of 1.55 V vs.RHE.Through the characterization,it was found that the catalyst was CoOx doped with N,F and B,and it was an amorphous sheet material,which all determined the high catalytic activity of the catalyst.Secondly,The Co-AEEA complexes were formed in situ with AEEA and Co2+,was used as precursor to prepare a very thin layer of catalyst film was deposited on FTO and CP by CV deposition.In the borate buffer solution?0.6 M,pH=9.2?,the onset potential of Co-AEEA/FTO electrode for water oxidation is 1.1 V vs.NHE,and tafel slope was measured to be 73 mV·dec-1.the catalytic activity is similar to Co-Bi/FTO electrode with very small quantity of catalyst loading.The Co-AEEA/CP electrode exhibited excellent catalytic activity and stability,presumably due to the high activity of Co-AEEA and the larger electrochemical surface activity area of Co-AEEA/CP electrode... |
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