摘要
Designing efficient and stable electrocatalysts to improve the oxygen evolution reaction(OER)with slow reaction kinetics is essential to improve hydrogen production from electrochemical water splitting.This research has prepared a series of FeOOH/Ni(HCO_(3))_(2)heterostructured materials(denoted as FeOOH_(x)/Ni(HCO_(3))_(2))by a one-pot solvothermal method.The OER performance of the catalysts was maximized by finely tuning the content of different components,heterogeneous interfaces,and electronic structures.Specifically,the obtained FeOOH0.60/Ni(HCO_(3))_(2)heterostructured nanosheets had the lowest overpotential of 216 mV at a current density of 10 mA·cm^(−2)and were stable at a high current density of 100 mA·cm^(−2)for more than 96 h.The excellent OER activity and stability were still maintained in alkaline natural seawater(1 M KOH+seawater).When FeOOH0.60/Ni(HCO_(3))_(2)was used as the anode for water splitting,the electrolyzer provided a current density of 10 mA·cm^(−2)at a very low cell voltage of 1.51 V(1.56 V at 1 M KOH+seawater)and exhibited superior stability.The outstanding OER performance is ascribed to the synergistic effect of FeOOH and Ni(HCO_(3))_(2)upon heterostructure formation,as well as the altered electronic structure between the heterogeneous interfaces and the suitable hierarchical nanosheet morphology facilitating many active sites.This work provides a promising direction for improving the electrocatalytic activity of nickel-based catalysts in seawater splitting,which has important implications for both hydrogen economy and environmental remediation.
基金
supported by the Tianjin Science and Technology Support Key Projects(No.20JCYBJC01420).
