Developing a highly efficient and cost-effective electrocatalyst for catalyzing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is fundamentally important for the practical application of the ove...Developing a highly efficient and cost-effective electrocatalyst for catalyzing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is fundamentally important for the practical application of the overall water splitting technique.Herein,a bifunctional electrocatalyst constituted by FexNiy and CeO_(2) nanoparticles supported on the N-doped nanocarbon(NC)is fabricated by a simple one-pot pyrolysis of the homogeneous mixture of Fe,Ni,Ce nitrates and melamine.The synergistic effect of each component in the FexNiy/CeO_(2)/NC gives rise to outstanding electrocatalytic activities and stability toward the HER and OER.For hydrogen evolution,the FexNiy/CeO_(2)/NC shows a smaller overpotential of 260 mV to achieve a current density of 50 mA cm^(-2) in a 1 M KOH electrolyte.More significantly,a small overpotential of 240 mV for FexNiy/CeO_(2)/NC affords an oxygen evolution current density of 10 mA cm^(-2),far lower than that of the benchmark IrO_(2).The practicability and electrocatalytic activity of the prepared FexNiy/CeO_(2)/NC under practical operation conditions are also investigated.In particular,the FexNiy/CeO_(2)/NC-based overall water splitting cell only needs a cell voltage of 1.70 V to output 10 mA cm^(-2) in alkaline electrolytes,comparable to that of the IrO_(2)∥Pt/C cell.The present study may pioneer a new avenue for developing novel bifunctional electrocatalysts with high-performance and low cost for water splitting.展开更多
基金supported by Taishan Scholar Program of Shandong Province,China(ts_(2)01712045)the Key Research and Development Program of Shandong Province(2018GGX104001,2019GGX102069)+1 种基金the Natural Science Foundation of Shandong Province of China(ZR2017MB054 and ZR2018BB008)2019 Research Funds(1.190002.01)of Ulsan National Institute of Science and Technology(UNIST).
文摘Developing a highly efficient and cost-effective electrocatalyst for catalyzing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is fundamentally important for the practical application of the overall water splitting technique.Herein,a bifunctional electrocatalyst constituted by FexNiy and CeO_(2) nanoparticles supported on the N-doped nanocarbon(NC)is fabricated by a simple one-pot pyrolysis of the homogeneous mixture of Fe,Ni,Ce nitrates and melamine.The synergistic effect of each component in the FexNiy/CeO_(2)/NC gives rise to outstanding electrocatalytic activities and stability toward the HER and OER.For hydrogen evolution,the FexNiy/CeO_(2)/NC shows a smaller overpotential of 260 mV to achieve a current density of 50 mA cm^(-2) in a 1 M KOH electrolyte.More significantly,a small overpotential of 240 mV for FexNiy/CeO_(2)/NC affords an oxygen evolution current density of 10 mA cm^(-2),far lower than that of the benchmark IrO_(2).The practicability and electrocatalytic activity of the prepared FexNiy/CeO_(2)/NC under practical operation conditions are also investigated.In particular,the FexNiy/CeO_(2)/NC-based overall water splitting cell only needs a cell voltage of 1.70 V to output 10 mA cm^(-2) in alkaline electrolytes,comparable to that of the IrO_(2)∥Pt/C cell.The present study may pioneer a new avenue for developing novel bifunctional electrocatalysts with high-performance and low cost for water splitting.
