过电位
双功能
电催化剂
析氧
氢氧化物
催化作用
石墨烯
材料科学
氧化物
介孔材料
无机化学
化学工程
协同催化
化学
纳米技术
电极
电化学
有机化学
冶金
物理化学
工程类
作者
Tianrong Zhan,Xiaolin Liu,Sisi Lu,Wanguo Hou
标识
DOI:10.1016/j.apcatb.2017.01.010
摘要
It is a crucial and challengeable task to develop non-precious metal catalysts for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in energy storage and conversion systems. Herein, a facile and cost-effective strategy was employed to prepare the mesoporous nitrogen doped NiFe layered double hydroxide/reduced graphene oxide (NiFe-LDH/NrGO) nanospheres via an one-pot solvothermal reaction by using GO, protonated g-C3N4 nanosheets (p-CNNS), mixed metal salts and alkali as precursors in presence of surfactant. The doping of p-CNNS resulted in the superior ORR activity compared to pristine NiFe-LDH and NiFe-LDH/rGO. The ORR results demonstrated that the NiFe-LDH/NrGO hybrid involved a perfect 4e mechanism with better durability and methanol tolerance ability than commercial 20% Pt/C catalyst in 0.1 M KOH. NiFe-LDH/NrGO also displayed the excellent OER activity with a close onset overpotential to NiFe-LDH/rGO, but a more negative overpotential and a higher current density at η > 300 mV in the same alkaline medium. Overall, the outstanding catalytic performance toward both ORR and OER suggested that the NiFe-LDH/NrGO composite can be a new non-precious metal bifunctional catalyst in the related renewable energy fields.
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