Defective graphene synergizes with NiO x nanosheets to facilitate dual-defect-assisted two-electron oxygen reduction

Résumé fourni par la source

One of the biggest challenges in the electrochemical synthesis of H2O2 is the development of high-performance and economical catalysts. In this work, a two-dimensional composite material consisting of NiOx nanosheets and defective graphene (DG) (NiOx@DG) was prepared and showed excellent electrocatalytic performance toward electrosynthesis of H2O2 from oxygen reduction reaction. Particularly, the NiOx@DG catalysts present superior activity indicators to physical mixing counterparts (NiOx-DG), encompassing a high onset potential of 0.78 V, high efficiency and 2e- selectivity over a wide potential range between 0.20-0.60 V (maximal value of 95%). The high activity of NiOx@DG can be attributed to the dual-defects (oxygen vacancies on NiOx and topological defects on DG)-induced strong electronic metal–support interaction. Such multi-defects collaborative enhancement strategy may provide a promising avenue for the preparation of high-performance catalysts toward application in different reactions.

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