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Article Abstract
The oxygen vacancies of defective iron-cobalt oxide (FeCoO -Vo) nanosheets are modified by the homogeneously distributed sulfur (S) atoms. S atoms can not only effectively stabilize oxygen vacancies (Vo), but also form the Co-S coordination with Co active site in the Vo, which can modulate the electronic structure of the active site, enabling FeCoO -Vo-S to exhibit much superior OER activity. FeCoO -Vo-S exhibits a mass activity of 2440.0 A g at 1.5 V vs. RHE in 1.0 m KOH, 25.4 times higher than that of RuO . The Tafel slope is as low as 21.0 mV dec , indicative of its excellent charge transfer rate. When FeCoO -Vo-S (anode catalyst) is paired with the defective CoP /Ni P (cathode catalyst) for overall water splitting, current densities of as high as 249.0 mA cm and 406.0 mA cm at a cell voltage of 2.0 V and 2.3 V, respectively, can be achieved.
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