Abstract
We must urgently synthesize highly efficient and stable oxygen-evolution reaction(OER)catalysts for acidic media.Herein,we constructed a series of Ti mesh(TM)-supported RuO2/CoMoyOx catalysts(RuO2/CoMoyOx/TM)with heterogeneous struc-tures.By optimizing the ratio of Co to Mo,RuO2/CoMo2Ox/TM with low Ru loading(0.079 mg/cm2)achieves remarkable OER performance(η=243 mV at 10 mA/cm2)and high stability(300 h@10 mA/cm2)in 0.5 mol/L H2SO4 electrolyte.The activity of RuO2/CoMoyOx/TM can be maintained for 50 h at 100 mA/cm2,and a water electrolyzer with RuO2/CoMo2Ox/TM as anode can operate for 40 h at 100 mA/cm2,suggesting the remarkable OER durability of RuO2/CoMoyOx/TM in acidic electrolyte.Owing to the heterogeneous interface between CoMo2Ox and RuO2,the electronic structure of Ru atoms was optimized and electron-rich Ru was formed.With modulated electronic properties,the dissociation energy of H2O is weakened,and the OER barrier is lowered.This study provides the design of low-cost noble metal catalysts with long-term stability in an acidic environment.
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