Synchronously integration of Co, Fe dual-metal doping in Ru@C and CDs for boosted water splitting performances in alkaline media

摘要

The unsatisfactory performances and complicated synthesis procedures greatly impeded the large-scale industrial applications of various electrocatalysts. Herein, two different functional electrocatalysts were simultaneously synthesized within one-pot reactor through hydrothermal method. The Co, Fe co-doped carbon dots (CoFe-CDs) with electrocatalytic oxygen evolution reaction (OER) activities and carbon-supported Co, Fe co-doped Ru networks (CoFeRu@C) with hydrogen evolution reaction (HER) activities, were directly obtained from the supernatant and the precipitation, respectively. Benefiting from the synergistic effect of dual-metal doping, the CoFeRu@C exhibited an extremely low overpotential of 4 mV for HER in 1 M KOH electrolyte, which was the lowest value among the previously reported electrocatalysts, and the CoFe-CDs showed excellent OER performance with an overpotential of 320 mV. Moreover, only 1.59 V was needed to achieve 10 mA cm(-2) for overall water-splitting. This work provided an innovative approach for simply creating diverse electrocatalysts and effectively regulating the catalytic activities by introducing multi-metal dopants.